CN115072938A - Kitchen waste wastewater treatment system and treatment process thereof - Google Patents
Kitchen waste wastewater treatment system and treatment process thereof Download PDFInfo
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- CN115072938A CN115072938A CN202210836975.2A CN202210836975A CN115072938A CN 115072938 A CN115072938 A CN 115072938A CN 202210836975 A CN202210836975 A CN 202210836975A CN 115072938 A CN115072938 A CN 115072938A
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- C—CHEMISTRY; METALLURGY
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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Abstract
The invention belongs to the technical field of kitchen waste wastewater treatment, and particularly relates to a kitchen waste wastewater treatment system and a kitchen waste wastewater treatment process. The system comprises a slurry tank, a three-phase separation unit, a regulating tank, an air flotation tank and a biochemical tank which are sequentially communicated, wherein the slurry tank is used for mixing kitchen waste wastewater to be treated with activated sludge. The slag slurry pool can control odor before kitchen waste wastewater enters a treatment process, dehydration and separation are convenient, activated sludge can adsorb oil phase in slurry after being combined with the kitchen waste wastewater, and the kitchen waste wastewater is mixed with sludge and a first flocculating agent, so that the dehydration efficiency can be further improved. The system can control the odor in the kitchen waste wastewater and simplify the treatment process of the kitchen waste wastewater.
Description
RELATED APPLICATIONS
The invention requires the invention name submitted at 11/15/2021 to be: a kitchen waste wastewater treatment system and priority of a treatment process thereof.
Technical Field
The invention relates to the technical field of kitchen waste wastewater treatment, in particular to a kitchen waste wastewater treatment system and a treatment process thereof.
Background
With the rapid development of economy and the continuous increase of population, the pollution condition of water resources is increasingly serious. The kitchen waste wastewater is used as common wastewater, the annual production amount is also increasing, the kitchen waste wastewater is mainly the wastewater generated by processing the kitchen waste, if the kitchen waste wastewater is not effectively processed and is directly discharged, serious pollution is caused to natural water and social environment, the kitchen waste wastewater has complex water quality, has the characteristics of high organic matter concentration, high ammonia nitrogen content, high sulfide content and the like, and has higher processing difficulty.
The existing kitchen waste wastewater treatment system is complex, the equipment investment is high, the treatment effect is difficult to maintain, and secondary pollution is easily caused.
But the odor in the kitchen waste wastewater can not be controlled in the prior art, and the treatment process is more complex.
Disclosure of Invention
Therefore, the invention aims to overcome the defects that the odor in the kitchen waste wastewater cannot be controlled and the treatment process is complex in the prior art, and provides a kitchen waste wastewater treatment system and a treatment process thereof.
Therefore, the invention provides the following technical scheme.
The invention provides a kitchen waste and wastewater treatment system, which comprises:
a slurry tank, a three-phase separation unit, a regulating tank, an air floatation tank and a biochemical tank which are sequentially communicated,
the slurry tank is used for mixing kitchen waste wastewater to be treated with activated sludge.
Optionally, the sludge treatment device further comprises a sludge scraping pool communicated with the sludge inlet of the sludge pool.
Optionally, an inlet of the slag scraping tank is communicated with the air floatation tank and/or the biochemical tank.
Optionally, the device further comprises a clean water tank communicated with the biochemical tank.
Optionally, the biochemical pool is an engebbart synchronous nitrification and denitrification biochemical pool (Engelbart SST biochemical pool).
Optionally, a gas stripping zone, an aeration zone and a clarification zone are arranged in the biochemical tank.
The gas stripping area comprises an aeration hose, a gas stripping bracket, an air inlet pipe, a distributor and a water inlet pipe; the aeration zone comprises an Engrab aeration pipe, an aeration bracket, a lifting device, an air inlet pipe and a distributor; the clarification zone comprises a filler, a filler bracket, a water outlet pipe and a bin separation partition plate.
Optionally, the aeration hose is provided by engbai manufacturers and has a model number of DN 50; the gas stripping zone, the aeration zone and the clarification zone are all arranged conventionally.
Optionally, a filler is arranged in the clarification zone, the filler is an inclined tube filler, the filler is provided by engobe manufacturers, and the model of the filler is VR/VF. The filler can change the flow state of a water body from turbulent flow to steady flow by utilizing a labyrinth multi-channel structure, and simultaneously forms a suspended sludge layer, the filler is positioned in the middle of a clarification zone, the distance between the bottom of the filler and the bottom of a pool is about 1.3 meters, and the top of the filler is lower than the water surface.
Optionally, a microbial film is attached to the surface of the filler, and the microbial film has a variety of microorganisms, including autotrophic bacteria and heterotrophic bacteria, such as common denitrifying bacteria and acidophilic bacteria.
Optionally, the three-phase separation unit is one of a three-phase horizontal screw centrifuge and a three-phase disc separator.
The invention also provides a treatment process of the kitchen waste wastewater, which is characterized by comprising the following steps:
and (3) deodorization: mixing the kitchen waste wastewater to be treated with activated sludge for deodorization;
three-phase separation: mixing the deodorized wastewater with a first flocculating agent, and carrying out three-phase separation to obtain sludge, an oil phase and a water phase;
adding chemicals and air flotation: mixing the separated water phase with a ferric salt flocculating agent, and carrying out air floatation treatment;
biochemical treatment: and (4) performing biochemical treatment on the wastewater subjected to air floatation.
Optionally, the usage ratio of the kitchen waste wastewater to the activated sludge is 1: 1.
the mixing mode in the deodorization step is stirring and mixing.
Optionally, the activated sludge is stabilized sludge after acclimation, the stabilized sludge after acclimation is sludge of a municipal sewage plant, and the sludge is adjusted and acclimated to form stabilized sludge, the sludge is cultured under a low dissolved oxygen condition, ammonia nitrogen and total nitrogen in a liquid phase of a sludge mixed liquid are both less than 20mg/l, the sludge settleability is good, and solid-liquid separation is easy.
Optionally, scum produced in the chemical-adding air flotation step and sludge produced in the biochemical treatment step are used as activated sludge.
The first flocculating agent is at least one of polyacrylamide, polymeric ferric sulfate and polymeric aluminum chloride;
the ferric salt flocculating agent is at least one of polymeric ferric sulfate, ferric trichloride and ferric sulfate.
Optionally, the addition amount of the first flocculant needs to be calculated and determined according to the quality and quantity of the incoming water and the solid content, and the addition amount of the ferric salt flocculant is the addition amount of a conventional flocculant.
Optionally, the method also comprises the step of adding a disinfectant into the biochemically treated wastewater;
optionally, the disinfectant is at least one of sodium hypochlorite, liquid chlorine and chlorine dioxide. Since liquid chlorine has high toxicity and chlorine dioxide needs to be prepared on site, sodium hypochlorite is often selected as the disinfectant in practical application.
Optionally, the biochemical treatment comprises the steps of gas stripping, aeration and sedimentation.
The air stripping step is that air provided by the fan enters the air distributor through the air inlet pipe, is redistributed to the aeration hose, generates hydraulic lifting through air plug flow, and forms backflow in the biochemical pool by being lifted and pushed by the air.
The aeration step is characterized in that blanket aeration is adopted, air provided by a fan enters an air distributor through an air inlet pipe and is redistributed into aeration hoses, the aeration hoses are distributed in a long blanket manner, an aeration pipe special for Engbai is adopted, the general oxygen mass transfer is 20-30%, the Engbai aeration pipe can be 40-50%, the power consumption of the fan is saved by at least 30%, the maintenance is easy, and the maintenance can be realized through large flux or chemical cleaning.
The settling step is that the process adopts a built-in settling area, automatically flows into the settling area after the biochemical treatment of the whole tank, and is further treated by microorganisms on the surface of the filler, and the sludge settles and clarifies the effluent.
Optionally, the kitchen waste wastewater treatment process provided by the invention adopts the kitchen waste wastewater treatment system provided by the invention.
The technical scheme of the invention has the following advantages:
1. the invention provides a kitchen waste wastewater treatment system which comprises a slurry tank, a three-phase separation unit, an adjusting tank, an air floatation tank and a biochemical tank which are sequentially communicated, wherein the slurry tank is used for mixing kitchen waste wastewater to be treated with activated sludge. The slag slurry pool can control odor before kitchen waste wastewater enters a treatment process, dehydration and separation are convenient, activated sludge can adsorb oil phase in slurry after being combined with the kitchen waste wastewater, and the kitchen waste wastewater is mixed with sludge and a first flocculating agent, so that the dehydration efficiency can be further improved.
2. According to the kitchen waste wastewater treatment system, the mixed liquid from the residue slurry tank is separated from the water phase, the sludge and the oil phase in the sewage by the three-phase separation unit, and the separation efficiency is greatly improved after the activated sludge flocs are mixed.
3. The invention is provided with the Engri synchronous nitrification and denitrification biochemical tank, and the gas stripping area of the biochemical tank is provided with the Engri aeration pipe, so that the reflux ratio effect of plug flow of dozens of times can be achieved; the aeration area of the biochemical tank is provided with a blanket type aeration bracket, an Engri aeration pipe, an air distributor, an air inlet pipe and a lifting device, so that the uniform aeration of the whole tank can be realized, the damaged aeration pipe at the bottom of the tank is lifted to the top of the tank by the lifting device of the blanket type aeration with the help of simple manpower, and the aeration pipe can be replaced without cleaning the tank; the filler is arranged in the clarification area, so that the water can be uniformly distributed, the ascending flow rate is high, the water yield is high, and a microbial film is attached to the surface of the filler, so that biochemical effluent can be rapidly settled, clarified and separated.
4. The invention provides a wastewater treatment process of a kitchen waste wastewater treatment system, which comprises the following steps: mixing the kitchen waste wastewater to be treated with activated sludge for deodorization; three-phase separation: mixing the deodorized wastewater with a first flocculating agent, and carrying out three-phase separation to obtain sludge, an oil phase and a water phase; adding chemicals and air flotation: mixing the separated water phase with a ferric salt flocculating agent, and carrying out air floatation treatment; biochemical treatment: and (4) performing biochemical treatment on the wastewater subjected to air floatation. Compared with the traditional process for treating the kitchen waste wastewater, the process can treat the kitchen waste wastewater only through the steps, simplifies the traditional treatment process of the kitchen waste wastewater, and controls the odor of the mixed kitchen waste wastewater.
5. According to the process, the first flocculating agent is added in the three-phase separation process, so that the sludge zoogloea cohesiveness is stronger and the sludge dewatering efficiency is high when the sludge is dewatered; the ferric salt flocculating agent is added in the deodorization process and the medicine-adding air floatation process, so that the whole process can also carry out turbidity removal, decoloration, deoiling, dehydration, degerming, deodorization, algae removal, removal of COD, BOD, heavy metal ions and the like in water in the air floatation process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a kitchen garbage waste water treatment system according to embodiment 1 of the present invention;
reference numerals:
1-a slurry tank; 11-a water inlet; 12-a water outlet; 13-sludge inlet; 2-scraping a slag pool; 3-a regulating reservoir; 4-a three-phase separation unit; 5-an air floatation tank; 6-biochemical pool; 7-clean water pool.
Detailed Description
The following examples are provided to better understand the present invention, not to limit the best mode, and not to limit the content and protection scope of the present invention, and any product that is the same or similar to the present invention and is obtained by combining the present invention with other features of the prior art and the present invention falls within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
The embodiment provides a kitchen waste wastewater treatment system, as shown in fig. 1, which comprises a slurry tank 1, a three-phase separation unit 4, an adjusting tank 3, an air flotation tank 5 and a biochemical tank 6, which are sequentially communicated with one another.
The slurry tank is provided with a water inlet 11, a water outlet 12 and a sludge inlet 13. The water inlet 11 is used for enabling kitchen waste wastewater to be treated to enter the slurry tank, the water outlet 12 is used for discharging the kitchen waste wastewater mixed with activated sludge into the three-phase separation unit 4, and the sludge inlet 13 is used for discharging the activated sludge in the residue scraping tank 1 into the slurry tank 1. In the slurry tank 1, the kitchen waste wastewater and the activated sludge are fully mixed, so that odor in the kitchen waste wastewater can be removed, and an oil phase in the wastewater can be adsorbed.
The three-phase separation unit 4 may be one of a three-phase horizontal screw centrifuge and a three-phase disc separator. In the embodiment, a three-phase horizontal screw centrifuge is adopted and provided by Shanghai minister environmental protection customization. The inlet of the three-phase separation unit 4 is connected with the water outlet 12 of the slurry tank. By arranging the three-phase separation unit 4, the mixed liquid from the slurry tank 1 can be separated into a water phase, sludge and an oil phase.
The inlet of the regulating reservoir 3 is connected with the liquid phase outlet of the three-phase separation unit 4. The purpose of the conditioning tank 3 is to temporarily store the liquid phase coming out of the three-phase separation unit 4.
The inlet of the air floatation tank 5 is connected with the outlet of the adjusting tank 3, and the air floatation process adopted in the air floatation tank 5 is one of electrolytic air floatation, aeration air floatation and dissolved air floatation. In the embodiment, an aeration air floatation mode is adopted, and a slag scraping plate is arranged above the air floatation tank 5. Suspended matters and colloidal substances can be further removed through an air floatation mode, and scum is scraped into the scum scraping pool 2 by the scum scraping plate.
The inlet of the biochemical tank 6 is connected with the outlet of the air floatation tank 5, and the biochemical tank 6 is internally provided with an air stripping area, an aeration area and a clarification area. The air stripping area arranged in the biochemical pool 6 comprises an aeration hose and an air stripping bracket, the air stripping area can achieve the reflux ratio effect which is dozens of times of that of the air stripping by the air stripping technology by arranging the aeration hose, and the aeration pipe can be fixed by arranging the air stripping bracket to stabilize the aeration state so as to ensure that the air stripping area is uniformly aerated; the aeration area arranged in the biochemical pool 6 comprises a blanket type aeration support, an aeration hose, an air distributor, an air inlet pipe and a lifting device, the aeration with high flux and low dissolved oxygen can be achieved by arranging the aeration hose, the oxygen mass transfer efficiency is up to 50%, the cross knotting and swinging of the aeration pipe at the bottom of the pool can be avoided by arranging the blanket type aeration support, so that the aeration effect is influenced, the aeration pipe can be replaced without stopping water when the pool is not cleaned by arranging the lifting device, and the maintenance is more convenient; the clarification area that sets up in the biochemical pond 6 includes filler, filler support, divides the storehouse baffle, through setting up the filler, can the water distribution even, the velocity of rising flow is fast, the water yield is big, through setting up branch storehouse baffle, can separate out water, and the surface of filler adheres to there is the microbial film, can make biochemical play water subside rapidly, clarification separation.
The slag scraping pool 2 of the system is also communicated with the biochemical pool 6, and the outlet of the slag scraping pool 2 is connected with the sludge inlet 13 of the slag slurry pool 1. And the scum in the floatation tank 5 and the residual activated sludge in the biochemical tank 6 are discharged into the scum tank 1 by the scum scraping tank 2, so that the wastewater in the scum tank 1 and the activated sludge are fully mixed, and the mixing mode adopts stirring and mixing.
In some alternative embodiments, the system further comprises a clean water tank 7, and an inlet of the clean water tank 7 is connected with an outlet of the biochemical tank 6. The clean water tank 7 is used for storing the effluent of the biochemical tank 7 and discharging the effluent after reaching the standard, wherein the standard reaching the standard is the highest standard which can reach the first-class A discharge standard.
Example 2
The embodiment provides a kitchen waste wastewater treatment process, which adopts the system provided by the embodiment 1 and comprises the following specific processes:
firstly, the kitchen waste wastewater to be treated is discharged into the slurry tank 1 through the water inlet 11 of the slurry tank 1. Municipal sludge needs to be added in the initial stage of the process, and after the system runs stably, the use requirements of the deodorization stage on the activated sludge can be met by the slag generated by the air floatation tank 5 and the sludge generated by the biochemical tank 6; every cubic meter of kitchen waste and wastewater in the slurry tank 1 and every cubic meter of activated sludge (stabilized sludge generated after acclimation of sludge in a municipal sewage plant) are fully mixed in a stirring manner.
The mixed liquid is discharged into a three-phase horizontal decanter centrifuge through a water outlet 12 of the slurry tank 1 to be mixed with 1mg (put in per ton of water) of polyacrylamide, the separation rate is 12kg-DS/h for three-phase separation, the separated oil phase and sludge are discharged outside, the water phase flows into an adjusting tank 3 through an overflow pipe, and the adjusting tank 3 plays a role in temporarily storing the three-phase separated water phase.
The water in the regulating tank 3 enters the air floatation tank 5 through a lift pump, 5L of polymeric ferric sulfate solution with the content of 12% is put into each ton of water, suspended substances and colloidal substances are further removed, scum generated by air floatation is scraped into the scum scraping tank 2 through a scum board, and waste water after air floatation automatically flows into an air lifting area of the biochemical tank 6. The air introduced into the air flotation tank 5 is air, and the amount of the introduced air is 0.1m 3 And h, the biochemical pool 6 is an Engrab synchronous nitrification and denitrification biochemical pool.
The wastewater entering the air stripping area of the biochemical pool 6 is continuously lifted into the aeration area through air stripping, the air stripping area is provided with an aeration pipe, air is introduced into the air stripping area through the aeration pipe, the gas velocity introduced into the air stripping area is 200L/min, the sewage is subjected to synchronous nitrification and denitrification reaction in the aeration area, a blanket type aeration system is arranged in the aeration area, eight aeration pipes are arranged in one group, the aeration pipes are arranged in two groups, the air is introduced into the aeration area through a distributor and the aeration pipe, the aeration rate is 500L/min, the sludge concentration in the aeration area is 8000mg/L, the retention time of the sewage in the biochemical pool 6 is 13d, the reflux is more than 100 times, and the sludge age is more than 30 d. The biochemical effluent is settled in the clarification area, the sludge can be quickly settled through the filler in the clarification area, and the settling time is one hour. And (4) carrying out mud-water separation, lifting the residual sludge into the residue scraping pool 2 through a pump, enabling the obtained effluent to flow into a clean water pool 7, and then adding 0.12kg of sodium hypochlorite.
The sludge mixture in the slag scraping pool 2 flows into the slag slurry pool 1 through the sludge inlet 13 under the power of liquid level difference.
Example 3
The embodiment provides a kitchen waste wastewater treatment process, which adopts the system provided by the embodiment 1 and comprises the following specific processes:
firstly, the kitchen waste wastewater to be treated is discharged into the slurry tank 1 through the water inlet 11 of the slurry tank 1. Activated sludge needs to be added in the initial stage of the process, and after the system runs stably, the use requirements of the deodorizing stage on the activated sludge can be met by the slag generated by the air floatation tank 5 and the sludge generated by the biochemical tank 6; each cubic meter of kitchen waste and wastewater in the slurry tank 1 is fully mixed with each cubic meter of activated sludge (stabilized sludge generated after acclimation of sludge in municipal sewage plants).
The mixed liquid is discharged into a feed inlet of a spiral shell stacking separator through a water outlet 12 of a slurry tank 1 to be mixed with 1mg (per ton of water) of polyaluminium chloride, the separation rate is 6kg-DS/h to carry out three-phase separation, an oil tank and sludge obtained by separation are discharged outside, a water phase flows into an adjusting tank 3 through an overflow pipe, and the adjusting tank 3 plays a role in temporarily storing the water phase after the three-phase separation.
The water in the regulating tank 3 enters an air floatation tank 5 through a lift pump, 4kg of polyaluminium chloride is added per ton of water to further remove suspended substances and colloidal substances, scum generated by air floatation is scraped into a scum scraping tank 2 through a scum board, and the wastewater after air floatation automatically flows into an air stripping area of a biochemical tank 6. The gas introduced into the air flotation tank 5 is air, and the gas introduction speed is 0.1m 3 And h, the biochemical pool 6 is an Engrab synchronous nitrification and denitrification biochemical pool.
The wastewater entering the air stripping area of the biochemical pool 6 is continuously lifted into the aeration area through air stripping, the air stripping area is provided with aeration pipes, air is introduced into the air stripping area through the aeration pipes, the gas velocity of the introduced air stripping is 200L/min, the wastewater is subjected to synchronous nitrification and denitrification reaction in the aeration area, a blanket type aeration system is arranged in the aeration area, eight aeration pipes are arranged in one group, the aeration pipes are arranged in two groups, the air is introduced into the aeration area through a distributor and the aeration pipes, the aeration rate is 500L/min, the sludge concentration in the aeration area is 8000mg/L, the retention time of the wastewater in the biochemical pool 6 is 13d, the reflux is more than 100 times, and the sludge age is more than 30 d. The biochemical effluent is settled in the clarification area, the sludge can be settled rapidly through the filler in the clarification area, and the settling time is one hour. And (4) carrying out mud-water separation, lifting the residual sludge into the residue scraping pool 2 through a pump, enabling the obtained effluent to flow into a clean water pool 7, and then adding 0.12kg of sodium hypochlorite.
The sludge mixture in the slag scraping pool 2 flows into the slag slurry pool 1 through the sludge inlet 13 under the power of liquid level difference.
Comparative example 1
The comparative example provides a kitchen waste wastewater treatment process, adopts the system provided by embodiment 1, and the specific process is as follows:
firstly, the kitchen waste wastewater to be treated is discharged into the slurry tank 1 through the water inlet 11 of the slurry tank 1. The kitchen waste wastewater is discharged into a three-phase horizontal spiral centrifugal machine through a water outlet 12 of a slurry tank 1 to be mixed with 1mg (per ton of water) of polyacrylamide, the separation rate is 12kg-DS/h to carry out three-phase separation, the separated oil phase and sludge are discharged outside, the water phase flows into an adjusting tank 3 through an overflow pipe, and the adjusting tank 3 plays a role in temporarily storing the water phase after the three-phase separation.
The water in the regulating tank 3 enters an air flotation tank 5 through a lift pump, 5L of 12% polyferric sulfate is added per ton of water to further remove suspended substances and colloidal substances, scum generated by air flotation is scraped into a scum scraping tank 2 through a scum board, and waste water after air flotation automatically flows into an air stripping area of a biochemical tank 6. The air introduced into the air flotation tank 5 is air, and the amount of the introduced air is 0.1m 3 And h, the biochemical pool 6 is an Engrab synchronous nitrification and denitrification biochemical pool.
The wastewater entering the air stripping area of the biochemical pool 6 is continuously lifted into the aeration area through air stripping, the air stripping area is provided with an aeration pipe, air is introduced into the air stripping area through the aeration pipe, the gas velocity introduced into the air stripping area is 200L/min, the sewage is subjected to synchronous nitrification and denitrification reaction in the aeration area, a blanket type aeration system is arranged in the aeration area, eight aeration pipes are arranged in one group, the aeration pipes are arranged in two groups, the air is introduced into the aeration area through a distributor and the aeration pipe, the aeration rate is 500L/min, the sludge concentration in the aeration area is 8000mg/L, the retention time of the sewage in the biochemical pool 6 is 13d, the reflux is more than 100 times, and the sludge age is more than 30 d. And (3) settling biochemical effluent in a clarification area, carrying out sludge-water separation, lifting the residual sludge into the residue scraping pool 2 through a pump, enabling the obtained effluent to flow into a clean water pool 7, and then adding 0.12kg of sodium hypochlorite.
The sludge mixture in the slag scraping pool 2 flows into the slag slurry pool 1 through the sludge inlet 13 under the power of liquid level difference.
Evaluation: examples 2 to 3 and comparative example 1 were evaluated. Sources of kitchen wastewater
The method for evaluating the odor is to realize qualitative and structural analysis by utilizing olfactory evaluation or using a gas chromatograph to impact gaseous molecules by adopting high-speed ions. By comparing the data of example 2 and comparative example 1, it was found that: the odor can be effectively controlled by mixing activated sludge to supply water and deodorizing.
The method for evaluating the treatment effect comprises the following steps:
firstly, the kitchen waste wastewater to be treated in the embodiments 2-3 and the comparative example 1 is detected through water inlet data, and the detection shows that the concentration of organic matters in raw water is more than 10000mg/L, the total nitrogen concentration is more than 2000mg/L, and the concentration of ammonia nitrogen is more than 350 mg/L.
Then the effluent is detected by a professional detection mechanism, and the detection result is shown in table 1
Table 1:
as can be seen from Table 1, the treatment effect is improved by the returned sludge, the odor is reduced while the adsorption effect is achieved, the effect of solid-liquid separation is facilitated, the acidity of the incoming water is neutralized, and the water outlet effect is greatly improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (16)
1. A kitchen waste wastewater treatment system is characterized by comprising a slurry tank, a three-phase separation unit, a regulating tank, an air floatation tank and a biochemical tank which are sequentially communicated,
the slag slurry pool is used for mixing the kitchen waste wastewater to be treated with activated sludge.
2. The kitchen waste and wastewater treatment system according to claim 1, further comprising a residue scraping tank communicated with the sludge inlet of the residue slurry tank.
3. The kitchen waste and wastewater treatment system according to claim 2, wherein the inlet of the residue scraping tank is communicated with the air floatation tank and/or the biochemical tank.
4. The kitchen waste and wastewater treatment system according to any one of claims 1 to 3, further comprising a clean water tank communicated with the biochemical tank.
5. The kitchen waste and wastewater treatment system according to claim 4, wherein the biochemical tank is an Engbay synchronous nitrification and denitrification biochemical tank.
6. The kitchen waste and wastewater treatment system according to claim 5, wherein a gas stripping zone, an aeration zone and a clarification zone are arranged in the biochemical tank.
7. The kitchen waste and wastewater treatment system according to claim 6, wherein a filler is arranged in the clarification zone.
8. The kitchen waste and wastewater treatment system according to claim 7, wherein a microbial film is attached to the surface of the filler, and the thickness of the filler is 0.5-2 mm.
9. The kitchen waste and wastewater treatment system according to claim 1, wherein the three-phase separation unit is one of a three-phase horizontal screw centrifuge and a three-phase disc separator.
10. The treatment process of the kitchen waste wastewater is characterized by comprising the following steps:
and (3) deodorization: mixing the kitchen waste wastewater to be treated with activated sludge for deodorization;
three-phase separation: mixing the deodorized wastewater with a first flocculating agent, and carrying out three-phase separation to obtain sludge, an oil phase and a water phase;
adding chemicals and air flotation: mixing the separated water phase with a ferric salt flocculating agent, and performing air floatation treatment;
biochemical treatment: and (4) performing biochemical treatment on the wastewater subjected to air floatation.
11. The kitchen waste wastewater treatment process according to claim 10, wherein the dosage ratio of the kitchen waste wastewater to the activated sludge is 1: 1;
the activated sludge is stabilized sludge.
12. The kitchen waste and wastewater treatment process according to claim 10, wherein the sludge produced in the chemical-adding air flotation step and/or biochemical treatment step is recycled to the deodorization step as activated sludge.
13. The kitchen waste wastewater treatment process according to any one of claims 10 to 12, wherein the first flocculant is at least one of polyacrylamide, polymeric ferric sulfate and polymeric aluminum chloride;
the ferric salt flocculating agent is at least one of polymeric ferric sulfate, ferric trichloride and ferric sulfate.
14. The kitchen waste wastewater treatment process according to claim 13, further comprising the step of adding a disinfectant to the biochemically treated wastewater;
optionally, the disinfectant is at least one of sodium hypochlorite, liquid chlorine and chlorine dioxide.
15. The kitchen waste wastewater treatment process according to any one of claims 10 to 14, characterized in that the biochemical treatment comprises the steps of gas stripping, aeration and sedimentation.
16. The kitchen waste wastewater treatment process according to any one of claims 10 to 15, characterized in that the kitchen waste wastewater treatment system according to any one of claims 1 to 9 is adopted.
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