CN104226671B - Green treatment system and method for biological waste - Google Patents

Abstract

The invention provides a green biological waste treatment system. The biological waste green treatment system of the present invention includes: a separation tank to separate waste into solid waste and liquid waste; a fermentation tank to perform anaerobic fermentation of the solid waste to obtain biogas; a first gas treatment device, The obtained biogas is introduced to purify the biogas; a power generation system is introduced to burn the purified biogas to generate electricity; and an algae cultivation device is connected to the first gas treatment device. At the same time, the present invention also discloses a processing method using the green biological waste processing system.

Description

System and method for green treatment of biological waste

technical field

The present invention relates to a treatment of biological waste, and in particular to an animal waste treatment system and a treatment method for animal waste.

Background technique

Livestock farming poses a threat to the environment as waste from pigs, cattle, sheep, etc. can affect water sources such as aquifers, rivers, pools, lakes, etc. Livestock waste contains high concentrations of pollutants, such as ammonia nitrogen, nitrites, nitrates, and hydrogen sulfide, which are harmful to aquatic organisms (including animals and plants) and damage the ecosystems of freshwater rivers and lakes. Liquid and solid pollutants can also poison or injure humans and animals by touch or through the air. Therefore, in order to remove these pollutants, wastewater and solid waste from animal husbandry must be collected and treated to meet the conditions of environmental safety.

Animal wastewater is usually treated in open tanks where the wastewater is left to stand until the animal waste is decomposed and meets environmental safety requirements. However, when it rains, the water in these open pools can overflow and pollute nearby freshwater lakes and streams. In addition, the exhaust gas generated by these waste water or waste also pollutes the air and produces unpleasant odors. Furthermore, the treatment ponds for wastewater and solid waste will occupy a large area of land.

At present, many countries have discovered the problems caused by the use of pools to treat pig house wastewater or waste, and legislation has strictly limited the pools for waste treatment. Under the limited treatment pool, the number that can be reared is naturally limited.

Likewise, solid waste is often used by farmers as fertilizer. Although useful as fertilizer, the solid waste must be broken down, which usually takes 3 to 8 weeks. Ammonia from solid waste is harmful to plants until it is broken down. After decomposition, ammonia is decomposed into nitrogen compounds, which can be used as nutrients for plants. Prolonged exposure to large quantities of waste is dangerous and can spread germs by touch or through the air.

Furthermore, transporting these animal wastes is difficult and often in fully sealed trucks. This method is expensive and dangerous due to the possibility of spreading viruses and bacteria from the waste.

For the treatment method of wastewater rich in nutrients, reference can be made to, for example, US Patent No. 4,626,644, US Patent No. 4,721,569, US Patent No. 4,183,807, and US Patent No. 5,185,079. For a method of generating electricity using agricultural waste or biomass as fuel, see, for example, US Patent No. 5,121,600. For methods of converting methanol, fat or oil into methyl esters and biodiesel, reference can be made to, for example, US Patent No. 5,713,965, US Patent No. 6,015,440, and US Patent No. 6,440,057.

US Patent No. 4,372,856 discloses a method and equipment for anaerobically decomposing agricultural waste to generate methane and carbon dioxide. US Patent No. 5,922,092 discloses an oxidation system for solid waste in contact with air in a thermal reactor. The by-products of this method include diesel oil, asphalt, liquefied petroleum gas and so on. US Patent No. 6,410,283 discloses a method for generating electricity by anaerobic decomposition of sludge. US Patent No. 5,447,850 discloses a method for generating biogas from organic waste. This method mainly cultivates anaerobic microorganisms in waste. Next, ferment. Biogas is produced from this waste.

Although biogas can be used to generate electricity, the hydrogen sulfide in biogas will corrode the generator, so the biogas must be desulfurized first. If chemical desulfurization is used, a large amount of chemical waste will be produced. In the process of power generation, a large amount of carbon dioxide will be produced, causing secondary pollution. In addition, in addition to solid and liquid waste, animal husbandry also has the problem of odor (gas waste) pollution, but there is still no literature to disclose how to solve it.

Therefore, the animal husbandry industry still urgently needs a green treatment system and method for biological waste with high efficiency, low energy consumption, and no carbon dioxide emissions.

Contents of the invention

In view of the problems existing in the above-mentioned prior art, the present invention provides a green treatment system for biological waste, including: a separation tank for separating waste into solid waste and liquid waste; a fermentation tank for separating the solid waste into Anaerobic fermentation to obtain biogas; the first gas treatment device, importing the obtained biogas to purify the biogas; a power generation system, introducing the purified biogas for combustion and power generation; and an algae cultivation device, and the first gas processing device connect. Preferably, the waste is agricultural waste, especially animal husbandry waste.

In an embodiment of the present invention, wherein the first gas treatment device includes an aeration tower, and the aeration tower has algae liquid, when the biogas is introduced into the aeration tower, the biogas passes through the aeration tray Through the algae liquid in the way of aeration, the algae liquid will absorb the hydrogen sulfide in the biogas to achieve the effect of biogas desulfurization. At the same time, the algae liquid will also absorb carbon dioxide, so the methane concentration can be greatly increased after the biogas is purified. The methane concentration can be changed from the original The increase from 60% to about 90% not only prevents the power generation system from being corroded by hydrogen sulfide, but also improves the efficiency of power generation by burning biogas with high concentration of methane.

In an embodiment of the present invention, the first gas treatment device further includes a reaction tower connected to the aeration tower, and the reaction tower receives the algae liquid in the aeration tower to absorb hydrogen sulfide and carbon dioxide The algal liquid reacts to use sulfur and carbon molecules as nutrients for growth. Wherein the reaction absorption tower can be plural, and multiple reaction towers can be connected with the aeration tower in series and/or in parallel.

In an embodiment of the present invention, the first gas treatment device may also be a scrubber.

In an embodiment of the present invention, the green biological waste treatment system further includes an indoor space, the indoor space contains the waste and odor, and is equipped with a second gas treatment device and the algae cultivation device connected, there is algae liquid in the second gas treatment device, and the odor is introduced into the second gas treatment device, and the algae liquid in the second gas treatment device will absorb ammonia in the odor, sulfide Hydrogen and carbon dioxide, as the nutrients needed for the growth of algae, also achieve the effect of air purification.

In an embodiment of the present invention, the aeration tower, the reaction tower and/or the second gas treatment device may further include a light source to enhance the photosynthesis efficiency of the algae.

In an embodiment of the present invention, an aeration tank is also included, so that the liquid waste is subjected to aeration treatment, and the liquid waste produces carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and other oxidations after aeration treatment. As the nutrients needed for algae growth, the aeration tank is connected with the algae cultivation device, so that the liquid waste is passed into the algae cultivation device, and the natural growth of algae is used to achieve the effect of sewage treatment .

In an embodiment of the present invention, wherein the algae culture device is open or closed, various shapes of culture tanks, bags, tubes, columns, boxes, barrels, racks, etc., or three-dimensional culture systems. Wherein the algae fluid includes one or more algae fluids of red algae, green algae, diatoms, cyanobacteria, and other algae.

The present invention also provides a green treatment method for biological waste, including: providing waste and/or odor; introducing the waste into a separation tank for separation into solid waste and liquid waste; separating the solid waste import the solid waste into a fermentation tank, and perform anaerobic fermentation on the solid waste to obtain biogas; introduce the biogas into a first gas treatment device, and the first gas treatment device has algae liquid to purify the biogas; The purified biogas is introduced into the power generation system, and the biogas is burned to generate electricity to generate waste gas; and the waste gas is introduced into the algae cultivation device. Preferably, the waste is especially agricultural waste. Preferably, the waste gas is carbon dioxide.

In an embodiment of the present invention, wherein the first gas treatment device includes an aeration tower, and the aeration tower has algae liquid, and the biogas passes through the algae liquid in the aeration tower in the form of aeration , wherein the algae liquid absorbs hydrogen sulfide and carbon dioxide in the biogas. Wherein the first gas treatment device further includes a reaction tower connected to the aeration tower to receive the algae liquid in the aeration tower for reaction.

In an embodiment of the present invention, it also includes: introducing the odor into a second gas treatment device, and the second gas treatment device has algae liquid to absorb the odor molecules in the odor, and The odor molecules include ammonia and/or hydrogen sulfide and the like.

In an embodiment of the present invention, the aeration tower, the reaction tower and/or the second gas treatment device may further include one or several light sources to increase the photosynthesis efficiency of algae.

In an embodiment of the present invention, wherein the first gas processing device and/or the second gas processing device are connected to the algae cultivation device, and the algae cultivation device provides and/or receives the first gas Algae solution of the processing device and/or said second gas processing device.

In an embodiment of the present invention, it also includes introducing the liquid waste into an aeration tank for aeration treatment to form an aeration liquid, wherein the aeration tank is connected with the algae cultivation device, and the aeration The gas and liquid are introduced into the algae cultivation device, and the algae in the algae cultivation device will use the carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and other oxides in the aeration liquid as the cultivation components of the algae. At the same time, it can also purify sewage.

In an embodiment of the present invention, the algae cultivation device is an algae pond and/or a three-dimensional culture system, and the algae solution includes red algae, green algae, diatoms, cyanobacteria or other algae or any combination of other types of algae.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows:

Description of drawings

Fig. 1 is the schematic diagram of an embodiment of the biological waste green treatment system of the present invention;

Fig. 2 is a schematic diagram of an embodiment of the first gas treatment device of the present invention;

Figures 3a and 3b are different implementation states of the first gas treatment device of the present invention;

Fig. 4 is the flowchart of the biological waste green treatment method of the present invention;

Fig. 5 is the detection diagram of the result of processing hydrogen sulfide-containing gas by the first gas processing device of the present invention;

Fig. 6 is a detection diagram of the result of processing ammonia-containing gas by the first gas processing device of the present invention.

Explanation of reference signs

10. Green treatment system for biological waste; 12. Indoor space; 14. Separation tank; 16. Fermentation tank; 18, 200. First gas treatment device; 182, 202, 302. Aeration tower; Reaction tower; 21, power generation system; 22, 206, algae cultivation device; 24, aeration tank; 26, second gas treatment device; A, oxygen-containing gas; C, carbon dioxide; O, odor; M, biogas; W , waste; W1, solid waste; W2, liquid waste; W3, aeration tank wastewater; A1, A3, gas inlet; A2, A4, gas outlet; B1, B3, algae liquid inlet; B2, B4, algae Liquid outlet; T, aeration disc; L, light source; P, pump

S401, S403, S405, S407, S409, S411, S413, waste treatment steps

detailed description

The present invention provides a green biological waste treatment system, which utilizes one or more first gas treatment devices to purify biogas and remove odors (such as ammonia, hydrogen sulfide or sulfur dioxide, etc.) in the environment.

Fig. 1 is an implementation state of the green biological waste treatment system of the present invention. It should be noted that, in order to clearly describe the characteristics of the present invention, Fig. 1 is only a simple illustration of the embodiment of the present invention. A skilled person can add or modify the structure of the present invention according to different requirements.

Referring to FIG. 1 , the green biological waste treatment system 10 of the present invention includes an indoor space 12 containing waste W and/or odor O. The indoor space 12 of the present invention can be any form of building structure, such as wood, brick, cement and other structures. In one embodiment, animals (such as pigs, cows, sheep, horses, donkeys, chickens, ducks, geese, fish, etc.) are raised in the indoor space, and animal waste and/or odors are generated. In another embodiment, the indoor space is an animal waste depository.

The "waste" mentioned in the present invention refers to any animal waste. The waste of the present invention can come from various animals, including, but not limited to, pigs, cattle, sheep, horses, donkeys, chickens, ducks, geese, fish, etc., preferably pigs, cattle, sheep, donkeys and/or Horse, more preferably pig, cow. The waste of the present invention may be waste in solid and/or liquid form. In one embodiment, the animal waste is animal waste and washing water mixed with the animal waste.

After the waste W is introduced into the separation tank 14, it can be divided into solid waste W1 and liquid waste W2.

The "separation tank 14" described in the present invention is not particularly limited, as long as it can separate the solid (such as large particle matter, solid agglomerate) in the waste W from the liquid. Generally, solid-liquid separation can be divided into mechanical (Physical separation) separation, thermal separation, biological separation, etc. The separation tank of the present invention can be a sedimentation tank, a separation grid, a centrifuge, a filter device, a solid-liquid separator, and the like. In one embodiment, the separation tank is a commercially available solid-liquid separator.

After solid-liquid separation, the solid waste W1 is introduced into the fermenter 16 for anaerobic fermentation to obtain biogas M, while the liquid waste W2 is introduced into the aeration tank 24 .

In the present invention, the fermentation tank 16 is arranged after the separation tank 14 and is a biogas fermentation tank. The "fermentation tank or biogas fermentation tank" in the present invention is not particularly limited, as long as it can produce biogas and methane. The solid waste undergoes hydrolysis, acidification and methane action in the fermenter 16 to generate biogas M.

Fermentative bacteria, hydrogen-producing acetogens, hydrogen-utilizing acetogens, Methanobacterium spp., Methanococcus spp. ), Methanosarcina spp., Methanobrevibacter spp., Methanosphaera spp., Methanothermobacter spp., Methanothermus spp., Methane Methanococcus spp., Methanotorris spp., Methanococcus spp., Methanothermococcus spp., Methanocorpusculum spp., Methanoculleus spp. ), Methanofollis spp., Methanogenium spp., Methanolacinia spp., Methanomicrobium spp., Methanoplanus spp., Methanospirilla (Methanospirillum spp.), Methanocalculus spp., Methanolinea spp., Methanosaetaspp., Methanothrix spp., Halomethanococcus spp., Methanicrococcus spp., Methanococcoides spp., Methanohalobium spp., Methanohalophilus spp., Methanolobus spp., Methanohalobium Methanomethyllovorans spp., Methanosalsum spp., Methanosarcina spp., Mether micoccus spp.), Methanopyrus spp., etc., use these facultative and anaerobic microorganisms to convert complex polymers into methane, carbon dioxide, hydrogen sulfide and other gases.

The temperature in the fermentation tank is between 30-60°C, preferably 35-55°C. The pH value in the fermentation tank is between 5-8, preferably 6.5-7.5. The reaction (residence time) of the solid waste in the fermenter is more than 0.5 days, preferably more than 1 day, more preferably 10 days to 30 days. In fact, those skilled in the art can adjust the fermentation conditions (such as temperature, pH value, time, etc.) according to the type of fermenter, the type of microorganisms, and solid waste components to obtain the maximum amount of biogas.

The biogas M contains methane (CH4), carbon dioxide (CO2), hydrogen sulfide (H2S) and other gases, preferably methane.

Next, the biogas M is introduced into the first gas treatment device 18 . The first gas treatment device 18 includes an aeration tower 182 and a reaction tower 184 , and the aeration tower 182 and the reaction tower 184 contain algae liquid.

In one embodiment, the first gas treatment device only has an aeration tower, and the aeration tower has algae liquid, and the biogas passes through the algae liquid in an aeration manner. In another embodiment, the first gas treatment device includes an aeration tower and one or more reaction towers, and the reaction towers are connected to the aeration towers in series or in parallel. The reaction tower can receive the algae liquid from the aeration tower. In another embodiment, the first gas processing unit is a scrubber. The first gas treatment device may include one or several light sources (not shown). Such light sources include, but are not limited to, sunlight, incandescent light bulbs, fluorescent lights, LED lights, and the like.

The "algae liquid" mentioned in the present invention refers to a liquid containing algae. The algae solution used in the present invention includes Rhodophyta, Chlorophyta, Diatom, Cyanobacteria or combinations thereof. Algae include, but are not limited to, red algae (Rhodophyta), such as sea red filament algae (Polysiphonia); brown algae (Heteromontophyta), such as horses have algae (Sargassum) etc.; Spirogyra, Oedogonium, Closterium, ulva, Chlorella, Nannochloropsis; Diatom; Ceratium ); Cyanobacteria (Cyanobacteria), such as Spirulina (Spirulina) and so on.

When the biogas M passes through the algae liquid in the aeration tower 182 and the reaction tower 184 in the form of aeration, the carbon dioxide and hydrogen sulfide in M can be used as nutrients for the algae, and are absorbed by the algae in the algae liquid to achieve the purpose of purifying the biogas M. Purpose. The main gas in the purified biogas M is methane.

The purified biogas (methane) is introduced into the power generation system 21, and the biogas (methane) is burned to generate electricity.

The "power generation system" described in the present invention is any form of biogas generator. The biogas generator uses the combustion of biogas (methane) to generate high temperature and high pressure air, which drives the turbine for the generator to generate electricity. The power generation system of the present invention is not particularly limited, and can be any commercially available biogas generator.

In the process of biogas power generation, by-products such as carbon dioxide C, water vapor, and heat energy will be produced. Carbon dioxide C produced by burning biogas (methane) can be introduced into the algae cultivation device 22 . Because algae need an appropriate amount of carbon dioxide when they perform photosynthesis. Therefore, carbon dioxide C generated by biogas power generation can be introduced into the algae cultivation device 22 as a carbon source for algae.

In addition, water vapor and heat energy can be directly discharged into the atmosphere, and can also be recycled. For example, heat energy can be recovered for heating or keeping warm the aeration tower, the reaction tower, the first gas treatment device, and/or the algae cultivation device or the indoor space.

The "algae cultivation device" described in the present invention is any device that can cultivate algae, for example, an algae pond and/or a three-dimensional culture system (such as, can refer to Taiwan Patent No. I243205, the name of this Taiwan patent is: convert carbon dioxide into biological Quality bioreactor, the application date is February 5, 2001). The algae pool and/or three-dimensional culture system contains algae culture medium (such as f2, Walne, K, GPM medium, etc.), the drainage water of the cattle/pig house, and the nutrients required for the growth of various algae.

The temperature of the algae pond and/or the three-dimensional culture system is 10-40°C, preferably 20-30°C, most preferably 22-29°C. The light state of the algae can be illuminated for 12 hours, not illuminated for 12 hours, or continuously illuminated for 24 hours. In fact, those skilled in the art can adjust the growth conditions of algae (such as carbon dioxide concentration, medium composition, temperature, pH value, lighting time, lighting intensity, etc.) Get the maximum amount of algae (algae fluid).

The algae cultivation device 22 is connected to the first gas treatment device 18 . Therefore, the algae (algae solution) cultivated by the algae cultivation device 22 can be introduced into the first gas treatment device 18 , and the algae cultivation device 22 can recover the algae solution in the first gas treatment device 18 . By continuously circulating the algae liquid, the algae liquid in the first gas treatment device 18 can be maintained in a good state to effectively absorb carbon dioxide and hydrogen sulfide. The algae cultivation device 22 may include a light source (not shown). Such light sources include, but are not limited to, sunlight, incandescent light bulbs, fluorescent lights, LED lights, and the like.

The algal cultivation device 22 may be located indoors and/or outdoors. Indoors, the temperature, pH value, light time, etc., and light intensity of the algae cultivation device can be effectively controlled to obtain the best algae cultivation conditions. Outdoors, the algae cultivation device can be an open cultivation pond (algae pond), which can greatly reduce energy consumption. Therefore, the algae cultivating device 22 can be installed indoors and outdoors respectively, so as to cope with unfavorable conditions for algae growth caused by changing seasons.

In addition, it can be known from the above that the liquid waste W2 is introduced into the aeration tank 24 to generate the aeration tank wastewater W3.

There is activated sludge in the aeration tank 24, which contains various aerobic microorganisms, including Achromobarter, Flavobacterium, Alcaligens, Bacillus, Micrococcus ) and/or Pseudomonas, etc. The organic substances in the liquid waste W2 can be decomposed by microorganisms in the aeration tank 24 to produce oxides such as carbon oxides, nitrogen oxides, phosphorus oxides, and sulfur oxides. The residence time of the liquid waste W2 in the aeration tank 24 is more than 0.5 hours, preferably more than 2 to 5 hours, more preferably more than 8 hours.

Next, the aeration tank wastewater W3 is introduced into the algae cultivation device 22 . Since the aeration tank wastewater W3 contains carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and other substances, as well as other inorganic salts and trace elements, the aeration tank wastewater W3 can be used as a culture solution for algae.

In another embodiment of the present invention, the present invention also provides a second gas treatment device 26 , the second gas treatment device 26 is connected to the indoor space 12 and the algae cultivation device 22 , and the odor O is introduced into the second gas treatment device 26 .

The second gas treatment unit 26 is the same as or similar to the first gas treatment unit 18 . In one embodiment, the second gas treatment unit 26 is identical to the first gas treatment unit 18 . In another embodiment, the second gas treatment device 26 only has an aeration tower and does not have a reaction tower. Likewise, the second gas treatment device may include a light source (not shown). Such light sources include, but are not limited to, sunlight, incandescent light bulbs, fluorescent lights, LED lights, and the like.

The second gas treatment device 26 has algae fluid, and the odor O passes through the algae fluid in an aeration manner. Odor O contains mixed gases such as ammonia, hydrogen sulfide, carbon dioxide, and others, and has an odor. When the odor O passed through the algae liquid in the second gas treatment device 26 in an aeration mode, the algae in the algae liquid could absorb ammonia, hydrogen sulfide, carbon dioxide, etc. in the odor O, and produce oxygen through photosynthesis to achieve Deodorizing effect. The oxygen-containing gas A can be directly discharged to the outside, or introduced into the indoor space 12 to reduce the peculiar smell of the indoor space 12 .

Likewise, the second gas treatment device 26 is connected to the algae cultivation device 22 . Therefore, the algae (algae solution) cultivated by the algae cultivation device 22 can be introduced into the second gas treatment device 26 , and the algae cultivation device 22 can recover the algae solution in the second gas treatment device 26 . The algae liquid in the second gas treatment device 22 is kept in a good state through the continuous circulation of the algae liquid, so as to effectively absorb gases such as ammonia, hydrogen sulfide, and carbon dioxide.

It can be seen from the above that the green biological waste treatment system of the present invention has a first gas treatment device. The algae liquid in the first gas treatment device can absorb carbon dioxide and hydrogen sulfide in the biogas to achieve the effect of desulfurization and avoid hydrogen sulfide from corroding the generator. Purified biogas (methane) can obtain higher power generation efficiency in biogas power generation. The carbon dioxide produced by biogas power generation can be recycled to achieve zero carbon dioxide emissions.

On the other hand, the green biological waste treatment system of the present invention further includes a second gas treatment device. The algae liquid in the second gas treatment device can absorb the nitrogen-containing and sulfur-containing molecules in the odor (the odor in the animal husbandry or the environment), eliminate the odor, and generate oxygen.

Therefore, the green biological waste treatment system of the present invention can fully recycle animal waste (solid, liquid, gaseous waste), reduce pollution, and does not require a large amount of additional energy.

Fig. 2 is the implementation state of the first gas treatment device of the present invention. It should be noted that, in order to clearly describe the features of the present invention, Fig. 2 is only a simple illustration of the embodiment of the present invention. In actual application, those skilled in the art The structure of the present invention can be added or modified according to different demands.

Referring to FIG. 2 , the first gas treatment device 200 of the present invention includes an aeration tower 202 and a reaction tower 204 , and the numbers of the aeration tower 202 and the reaction tower 204 are not particularly limited. In one embodiment, the first gas treatment device includes an aeration tower and a reaction tower. In another embodiment, the first gas treatment device includes an aeration tower and several reaction towers.

The aeration tower 202 has a gas inlet A1 , a gas outlet A2 , an algae liquid inlet B1 and an algae liquid outlet B2 . The reaction tower 204 has a gas inlet A3 , a gas outlet A4 , an algae liquid inlet B3 and an algae liquid outlet B4 .

When treating gas, any gas, such as biogas, odor, etc., can be introduced into the aeration tower 202 through the gas inlet A1. The aeration tower 202 has algal liquid (not shown). Through the aeration tray T, the gas is aerated to pass through the algae liquid in the aeration tower 202 . The aeration tray T has many small holes, which can release the gas slowly.

In one embodiment, the gas is biogas, and during the aeration process, the algae liquid can absorb hydrogen sulfide, carbon dioxide, etc. of the biogas. In another embodiment, the gas is odor, and during the aeration process, the algae liquid can absorb ammonia, hydrogen sulfide, carbon dioxide and the like of the odor.

The algae liquid in the aeration tower 202 comes from the algae cultivation device 206 . The algae liquid in the algae cultivation device 206 can be introduced into the aeration tower 202 through the algae liquid inlet B1.

Next, the gas from the aeration tower 202 can be discharged from the gas outlet A2 and introduced into the reaction tower 204 through the gas inlet A3 of the reaction tower 204 . Likewise, the reaction tower 204 has algal liquid (not shown). Through the small holes on the aeration tray T, the gas is aerated to pass through the algae liquid in the reaction tower 204 .

After the gas passes through the aeration tower 202 and the reaction tower 204, most of the ammonia, hydrogen sulfide, and carbon dioxide in the gas can be absorbed by the algae to achieve the effect of biogas (methane) purification and deodorization. At the same time, the algal liquid in the aeration tower 202 and the reaction tower 204 can perform photosynthesis to generate oxygen.

The algae liquid in the aeration tower 202 can be discharged from the outlet B2 of the algae liquid, and introduced into the reaction tower 204 through the inlet B3 of the algae liquid of the reaction tower 204 . After the algae liquid in the reaction tower 204 fully reacts with the gas, it can be discharged to the algae cultivation device 206 through the algae liquid outlet B4.

The reaction tower 204 has a light source L. Such light sources include, but are not limited to, incandescent light bulbs, fluorescent lights, LED lights (eg, red LED lights, white LED lights) or combinations thereof. The number of light sources L is not particularly limited, and is preferably at least one, so that all algae have sufficient light. The illuminance of the light source can be between 1,00-20,000 Lux, preferably 5,00-15,000 Lux, more preferably 1,000-10,000 Lux. In another embodiment, the aeration tower 202 may also have a light source (not shown). The position of the light source can be inside or outside the aeration tower or the reaction tower, and there is no limitation.

In addition, the first gas treatment device 200 further includes a pump P. The number of pumps P is not particularly limited. The pump P can be respectively located on the pipelines of the gas inlet A1, the gas outlet A2, the algae liquid inlet B1, the algae liquid outlet B2, the gas inlet A3, the gas outlet A4, the algae liquid inlet B3 and/or the algae liquid outlet B4, so as to promote the gas and Algal fluid flow.

Fig. 3 is another embodiment of the first gas processing device of the present invention. It should be noted that, in order to clearly describe the features of the present invention, Fig. 3 is only a simple illustration of the embodiment of the present invention. A skilled person can add or modify the structure of the present invention according to different requirements.

It should be noted that the first gas treatment device of the present invention can be adjusted according to the type and amount (volume) of the gas. In an embodiment, the aeration tower 302 may be connected to a plurality of reaction towers 304 . As shown in FIG. 3 a , the aeration tower 302 is connected with two reaction towers 304 . In another embodiment, there is only the aeration tower 302 (Fig. 3b). The number of reaction towers can be 0, 1, 2, 3, 4, 5, 6, 7, 8 or more than 9. Generally speaking, when the amount of gas to be processed is larger, the number of reaction towers required is larger. Those skilled in the art can adjust the number of reaction towers according to the amount of gas, the type of algae, and the type of the first gas treatment device.

The present invention discloses embodiments of the first gas processing device 18 and the second gas processing device 26 for desulfurization and removal of odor molecules.

In another embodiment of the present invention, the present invention further provides a green treatment method for biological waste, as shown in FIG. 4 .

Referring to step S401, waste and odor are obtained from the indoor space. Animals are kept in this indoor space, which produces animal waste and bad smell.

Referring to step S403, the waste is introduced into the separation tank, so that the waste is separated into solid waste and liquid waste.

Referring to step S405, the solid waste is introduced into the fermenter, and the solid waste is subjected to anaerobic fermentation to obtain biogas (including methane, hydrogen sulfide, and carbon dioxide).

Referring to step S407, the biogas is introduced into the first gas treatment device to purify the biogas. The first gas treatment device has algae liquid, and the algae liquid can absorb hydrogen sulfide, carbon dioxide, etc. in the biogas.

Referring to step S409, the odor is introduced into the second gas treatment device to absorb the odor molecules in the odor and generate oxygen-containing air. The second gas treatment device has algae liquid, and the algae liquid can absorb ammonia, hydrogen sulfide, etc. in the odor.

Referring to step S411, the purified biogas is introduced into the power generation system, and the biogas is burned to generate electricity to generate carbon dioxide.

Referring to step S413, carbon dioxide is introduced into the algae cultivation device, and the carbon dioxide in the waste gas can be used as a carbon source for algae.

The present invention here discloses an embodiment of hydrogen sulfide removal by the first gas processing device 18, using the hydrogen sulfide produced by rotting eggs to detect the difference in hydrogen sulfide content before and after the gas containing hydrogen sulfide passes through the first gas processing device 18; this embodiment The first gas processing device 18 used is an aeration tower, and there is a holding tank with a volume of 8 liters in the aeration tower, and 8 liters of algae liquid with a concentration of 0.345g/L is housed in the aeration tower. The algae used in this embodiment is Chlorella.

In order to ensure the accuracy of gas detection, the aeration tower was set in a closed space in this experiment to prevent the detected gas from communicating with the outside air, and the experimental process included: first, the gas containing hydrogen sulfide was introduced into a closed gas mixing tank , detect that the initial hydrogen sulfide concentration is 0.2 mg/L, and the volume of the airtight gas mixing tank used in this embodiment is 125 liters; then, the gas containing hydrogen sulfide in the gas mixing tank is introduced into the first gas by an air pump In the treatment device, the gas containing hydrogen sulfide passes through the algae liquid in the storage tank through the aeration method, and the gas after passing through the first gas treatment device is redirected back to the airtight gas mixing tank, and the first gas treatment The upper end of the device is equipped with a pipeline connection detector to measure the content of hydrogen sulfide after gas circulation treatment; this embodiment is to detect the content of hydrogen sulfide before gas treatment and after 1 hour of gas circulation treatment, and the detection results are shown in Table 1.

Table I

Processing time (hours) 0hr 1hr Hydrogen sulfide concentration (mg/L) 0.2 0.02

As shown in Table 1, before the gas is treated by the first gas treatment device, the hydrogen sulfide concentration is 0.2 mg/L, and after the gas is treated by the first gas treatment device for one hour, the hydrogen sulfide concentration is reduced to 0.02 mg/L , as shown in Figure 5; after the gas is treated for one hour, the concentration of hydrogen sulfide consumed by the first gas treatment device is 0.18 mg/L, and the formula for the ratio of hydrogen sulfide removal by green algae is:

Gas volume (L) × consumption concentration (mg/L) ÷ algae content (g) ÷ time (hr)

Therefore, the content ratio of hydrogen sulfide removal by green algae in this embodiment is 125×0.18÷(8×0.345)÷1=8.15mg/hr/g, and it can be known from this embodiment that the first gas treatment device of the present invention It does have the effect of removing hydrogen sulfide in the gas, and the removal rate is as high as 90% in this embodiment.

In addition, the present invention discloses an embodiment of removing ammonia gas by the first gas processing device 18. The ammonia gas produced by 1% ammonia water is used to detect the difference in ammonia content before and after the gas containing ammonia passes through the first gas processing device 18. The first gas treatment device 18 used in the present embodiment is also an aeration tower, which has a volume of 8 liters in which the green algae liquid of 0.36g/L is housed, and is arranged in a closed space; the same , introduce the gas containing ammonia into the airtight gas mixing tank, and detect that the initial ammonia concentration is 100 mg/L; then, introduce the gas containing ammonia in the gas mixing tank into the first gas treatment device and pass through the aeration The gas passes through the algae liquid in the storage tank in the closed space, and the gas after passing through the first gas treatment device is then redirected back to the closed gas mixing tank, and the gas before treatment, after 3 hours of circulation treatment and circulation are detected respectively. After 5 hours of treatment, the content of ammonia in the gas, the test results are shown in Table 2.

Table II

Processing time (hours) 0hr 3 hours 5 hours Ammonia concentration (mg/L) 100 60 15

As shown in Table 2, before the gas is processed by the first gas treatment device, the ammonia concentration is 100 mg/L, and after the gas is processed by the first gas treatment device for three hours, the ammonia concentration is reduced to 60 mg/L. After five hours of treatment, the concentration of ammonia gas was further reduced to 15 mg/L, as shown in Figure 6; after five hours of gas treatment, the concentration of ammonia gas consumed by the first gas treatment device was 85 mg/L, and the ratio of ammonia gas content removed by green algae 737.8mg/hr/g, it can be seen from this example that the first gas treatment device of the present invention does have the effect of removing ammonia in the gas, and the removal rate reaches 85% after 5 hours of treatment.

The green biological waste treatment system and method of the present invention can effectively treat animal waste, and convert the organic matter of animal waste into biogas for power generation, and the carbon dioxide generated by biogas power generation can be recycled as a carbon source for algae, achieving zero carbon dioxide emission. At the same time, the green treatment method for biological wastes of the present invention can absorb the odor molecules of animal wastes to achieve the effect of cleaning the air.

The advantages of the green biological waste treatment system and method of the present invention include: (1) the biogas is first purified to improve power generation efficiency; (2) the carbon dioxide produced by biogas power generation can be recycled to achieve zero carbon dioxide emissions; (3) the use of power generation The generated carbon dioxide and animal wastes are used as nutrient sources for the algae liquid, reducing the cost of algae cultivation; and (4) all forms of animal wastes (including solid, liquid and gaseous (odor)) can be processed.

Therefore, the green biological waste treatment system and method of the present invention is a low-cost, energy-saving, environmentally friendly, and high-efficiency green treatment system and method for animal biological waste.

All the technical features of the invention disclosed in the specification can be combined in any way. Each technical feature disclosed in the specification can be replaced by other means that serve the same, equivalent or similar purpose. Thus, unless expressly stated otherwise, all features disclosed herein are only examples of a generic series of equivalent or similar features.

From the above, it can be seen that those skilled in the art can easily understand the essential features of the present invention, and can make many changes and adjustments to the present invention to apply to different uses and conditions without departing from its spirit and scope.

Claims (2)

1. a kind of bio-waste green treatment system, including：Separating tank, fermentation tank, first gas processing unit, Interior Space Between, second gas processing unit, electricity generation system, algatron, aeration tank, wherein：

The separating tank, discarded object is set to be separated into solid-state castoff and liquid discarded object；Wherein described discarded object is agriculture waste Thing；

The fermentation tank, the solid-state castoff is set to carry out anaerobic fermentation and obtain biogas；

The first gas processing unit includes aeration tower and multiple reaction towers form, and has algae solution in the aeration tower, will The biogas of acquisition imports the aeration tower to purify the biogas；Wherein described algae solution be selected from by red algae, green alga, blue-green algae, brown alga, The group that dinoflagellate forms；The multiple reaction tower is connected with the aeration tower in series or in parallel；It is wherein described more Individual is more than two integers；Wherein described reaction tower and/or the aeration tower include one or several light sources；

The algatron, it is connected with the first gas processing unit；The algatron be selected from culture pond, One or more in bag, pipe, post, case, bucket, frame and stereoscopic culture system；

The aeration tank, the liquid discarded object is set to carry out Air Exposure；Aeration tank is connected with the algatron, make through Liquid discarded object after Air Exposure is imported in the algatron；

The interior space contains discarded object and foul smell, and is connected with the second gas processing unit；

The second gas processing unit is connected with the algatron；Second gas processing unit includes one or several Light source；There is algae solution, and the foul smell is imported into the second gas processing unit in the second gas processing unit；Institute The algae solution stated in second gas processing unit includes the one or more in red algae, green alga；

The electricity generation system, the biogas after importing is purified carry out combustion power generation；Waste gas caused by wherein described electricity generation system is led Enter the algatron.

2. a kind of bio-waste green processing method, including：

Discarded object and foul smell are provided；Wherein described discarded object is agricultural wastes；

The discarded object is imported in separating tank, is separated into solid-state castoff and liquid discarded object；

The solid-state castoff is imported in fermentation tank, the solid-state castoff is carried out anaerobic fermentation and is obtained biogas；

The biogas is imported in first gas processing unit, the first gas processing unit further includes an aeration tower, and institute Stating has algae solution in aeration tower, to purify the biogas；

Wherein described biogas passes through the algae solution in the aeration tower in a manner of being aerated；

Wherein algae solution absorbs the hydrogen sulfide and carbon dioxide in the biogas；

Wherein described first gas processing unit also includes reaction tower, and the reaction tower is connected with the aeration tower, to receive State the algae solution in aeration tower；Wherein described reaction tower and/or the aeration tower include one or several light sources；

The foul smell is imported in second gas processing unit, there is algae solution in the second gas processing unit；It is wherein described Second gas processing unit includes one or several light sources；

Wherein described foul smell includes ammonia and/or hydrogen sulfide；

Wherein the algae solution system is selected from the group being made up of red algae, green alga, blue-green algae, brown alga, dinoflagellate；

It will be imported by biogas after purification in electricity generation system, the biogas that burns is generated electricity, and produces waste gas；

Wherein described waste gas is carbon dioxide；

The waste gas is imported into algatron；

Wherein described algatron is connected with the first gas processing unit and/or the second gas processing unit；

Wherein described algatron is provided and/or received at the first gas processing unit and/or the second gas Manage the algae solution of device；

The liquid discarded object is imported in aeration tank, Air Exposure is carried out to form aeration liquid, wherein the aeration tank and institute State algatron connection；

Wherein described aeration liquid is imported in the algatron, the culture composition as algae；

Algae in wherein described algatron can utilize nitrogen, phosphorus and the potassium in the aeration liquid；And

Wherein described algatron is one kind in culture pond, bag, pipe, post, case, bucket, frame and stereoscopic culture system It is or a variety of.