CN109987795A - A slaughterhouse sewage treatment system - Google Patents

Abstract

The invention belongs to the field of sewage treatment, and in particular relates to a sewage treatment system for a slaughterhouse, comprising a grid, a drum grid, and an oil separation sedimentation tank, wherein the grid, the rotary drum grid, and the oil separation sedimentation tank are connected in sequence, and the The oil separation sedimentation tank is divided into three paths: the first path: the upper layer of the oil separation sedimentation tank is connected to the drying plant through the oil collecting tank; the second path: the middle layer of the oil separation sedimentation tank is connected to the adjustment hydrolysis tank, and the adjustment hydrolysis tank is elevated The pump is connected to the air flotation tank, and the air flotation tank is connected to the secondary sedimentation tank through the IC reactor, the first-level contact oxidation tank, and the second-level contact oxidation tank in turn; the third way: the lower part of the oil separation sedimentation tank is connected to the sludge concentration tank. The sludge thickening tank is connected with the filter press. Adsorption technology, deep oxidation technology, filtration technology and other advanced treatment technologies are adopted to make the ammonia nitrogen, COD, SS and other indicators of wastewater meet the standards and meet the water quality requirements of miscellaneous water.

Description

A slaughterhouse sewage treatment system

technical field

The invention belongs to the field of sewage treatment, and in particular relates to a sewage treatment system of a slaughterhouse.

Background technique

The waste in the slaughtering process is mainly composed of high-concentration nitrogen-containing organic compounds, suspended and dissolved solids, protein, and oil, and the waste water produced contains a large amount of blood, oil, minced meat, pig hair, and undigested animals. If the pollutants such as feed, manure, sediment, and slaughtering wastewater are directly discharged without treatment, it will cause great harm to environmental sanitation and human and animal health, and at the same time cause a great waste of water resources. Although pig hair, meat scraps and undigested animal feed are all organic pollutants that can be biodegraded, after entering the wastewater biological treatment system, it requires a relatively long residence time to be fully biodegraded, which not only requires treatment The device has enough volume, and at the same time will increase the one-time investment of the project; and animal feces are very easily biodegradable organic pollutants. After entering the wastewater biological treatment system, the animal feces will naturally decompose under the action of biological enzymes. Increase the organic content in the wastewater, such as chemical oxygen demand and ammonia nitrogen. Under normal circumstances, the main organic matter in the slaughtering wastewater discharged from the slaughterhouse on the same day is CODcr≦4000mg/L, and ammonia nitrogen is less than 200mg/L. Biodegradable animal manure, after the animal manure enters the wastewater treatment system, the main organic matter in the wastewater will immediately change significantly. After the large scale, it will naturally increase the difficulty of wastewater treatment, increase the volume of wastewater treatment structures, and ultimately increase the one-time investment in the project.

Conventional slaughtering wastewater treatment processes are basically combined treatment methods with biological methods as the main integrated physical and chemical treatment processes. The removal efficiency is low, but the ideal treatment effect cannot be achieved. Therefore, an effective slaughterhouse sewage treatment system is urgently needed.

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a sewage treatment system, which can effectively treat the sewage in the slaughterhouse.

The specific technical scheme is as follows: a slaughterhouse sewage treatment system, comprising a grille, a drum grille, and an oil-separating sedimentation tank, wherein the grille, the rotating drum grille, and the oil-separating sedimentation tank are connected in sequence, and the oil-separating sedimentation tank is connected in sequence. Divided into three ways:

The first way: the upper layer of the oil separation sedimentation tank is connected to the drying plant through the oil collection tank;

The second way: the middle layer of the oil separation sedimentation tank is connected to the adjustment hydrolysis tank, the adjustment hydrolysis tank is connected to the air flotation tank through the lift pump, and the air flotation tank passes through the IC reactor, the first-level contact oxidation tank, the second-level contact oxidation tank and the secondary sedimentation The secondary sedimentation tank is connected with the sludge thickening tank on one side, and the other path is connected with the ozone reaction tower through the intermediate water tank, the filter and the activated carbon adsorption layer in turn, and the ozone reaction tower is connected with the reuse water tank;

The third way: the lower part of the oil separation sedimentation tank is connected with the sludge thickening tank, and the sludge thickening tank is connected with the filter press.

Further, the secondary sedimentation tank also communicates with the IC reactor through a reflux pipeline.

Further, the filter is a KYL-2# filter.

Further, the grid gap of the drum grid is 1 mm.

Further, the primary contact oxidation pool and the secondary contact oxidation pool are equipped with blowers.

Beneficial effects:

The waste in the slaughtering process is mainly composed of high-concentration nitrogen-containing organic compounds, suspended solids and dissolved solids, protein, and oil, and the produced wastewater contains a large amount of blood, oil, minced meat, pig hair, undigested If pollutants such as animal feed, manure, sediment, and slaughtering wastewater are directly discharged without treatment, it will cause great harm to environmental sanitation and human and animal health, and at the same time cause a great waste of water resources. Although pig hair, meat scraps and undigested animal feed are all organic pollutants that can be biodegraded, after entering the wastewater biological treatment system, it requires a relatively long residence time to be fully biodegraded.

The sewage passes through the grille and drum grille to remove pig hair, minced meat and large particle pollutants and then flows into the oil separation sedimentation tank, and the oil separation sedimentation tank is used to separate the oil pollution and sedimentary impurities. The effluent enters the regulating hydrolysis tank to regulate the water quality and quantity, and decompose macromolecular organic matter under the action of facultative microorganisms. The water is then lifted into the flotation tank. Using dissolved air flotation equipment, the remaining grease, suspended solids and organic pollutants in sewage can be removed in large quantities.

The sewage is then lifted by the pump and enters the IC reactor and the contact oxidation tank in turn, and COD, BOD and other pollutants are effectively removed by anaerobic and aerobic microorganisms. And the reaction of nitrification and denitrification is completed through the reflux of the mixed solution, so that the concentration of ammonia nitrogen in the sewage has also been greatly reduced. After the solid-liquid separation in the secondary sedimentation tank, it is lifted by the pump and passed through KYL-2# type filtration and activated carbon adsorption in turn, so that the indicators such as ammonia nitrogen, suspended solids, organic matter and other indicators in the effluent are effectively controlled. Finally, it is sterilized by ozone in the ozone reaction tower. Enter the recycling pool for storage and reuse or discharge. Finally, the ammonia nitrogen, COD, SS and other indicators of wastewater meet the standards, and meet the water quality requirements of miscellaneous water.

Detailed ways

A slaughterhouse sewage treatment system includes a grill, a drum grill, and an oil-separating sedimentation tank, wherein the grill, the drum grille, and the oil-separating sedimentation tank are connected in sequence, and the oil-separating sedimentation tank is divided into three paths:

The first way: the upper layer of the oil separation sedimentation tank is connected to the drying plant through the oil collection tank;

The second way: the middle layer of the oil separation sedimentation tank is connected to the adjustment hydrolysis tank, the adjustment hydrolysis tank is connected to the air flotation tank through the lift pump, and the air flotation tank passes through the IC reactor, the first-level contact oxidation tank, the second-level contact oxidation tank and the secondary sedimentation The secondary sedimentation tank is connected with the sludge thickening tank on one side, and the other path is connected with the ozone reaction tower through the intermediate water tank, the filter and the activated carbon adsorption layer in turn, and the ozone reaction tower is connected with the reuse water tank;

The third way: the lower part of the oil separation sedimentation tank is connected with the sludge thickening tank, and the sludge thickening tank is connected with the filter press.

Further, the secondary sedimentation tank also communicates with the IC reactor through a reflux pipeline.

Further, the filter is a KYL-2# filter.

Further, the grid gap of the drum grid is 1 mm.

Further, the primary contact oxidation pool and the secondary contact oxidation pool are equipped with blowers.

The sewage passes through the grille and drum grille to remove pig hair, minced meat and large particle pollutants and then flows into the oil separation sedimentation tank, and the oil separation sedimentation tank is used to separate the oil pollution and sedimentary impurities. The effluent enters the regulating hydrolysis tank to regulate the water quality and quantity, and decompose macromolecular organic matter under the action of facultative microorganisms. The water is then lifted into the flotation tank. Using dissolved air flotation equipment, the remaining grease, suspended solids and organic pollutants in sewage can be removed in large quantities.

The sewage is then lifted by the pump and enters the IC reactor and the contact oxidation tank in turn, and COD, BOD and other pollutants are effectively removed by anaerobic and aerobic microorganisms. And the reaction of nitrification and denitrification is completed through the reflux of the mixed solution, so that the concentration of ammonia nitrogen in the sewage has also been greatly reduced. After the solid-liquid separation in the secondary sedimentation tank, it is lifted by the pump and passed through KYL-2# type filtration and activated carbon adsorption in turn, so that the indicators such as ammonia nitrogen, suspended solids, organic matter and other indicators in the effluent are effectively controlled. Finally, it is sterilized by ozone in the ozone reaction tower. Enter the recycling pool for storage and reuse or discharge.

The sludge in the oil separation sedimentation tank and the excess sludge in the secondary sedimentation tank enter the sludge thickening tank to form a mud cake and transport it out through the belt filter press method; the floating oil in the oil separation sedimentation tank enters the drying plant through the oil collection tank; the blower Its function is to provide oxygen in the contact oxidation pool.

The grid gap of the rotary drum grid is a rotary drum grid of 1 mm.

The volume of the regulated hydrolysis tank can meet the treatment scale of 3000m3/d.

The air flotation equipment is KDAF combined dissolved air flotation, which meets the processing scale of 3000m3/d.

The contact oxidation tank structure includes a tank body, a filler, a water distribution device, and an aeration device, which is the prior art. The working principle is: set the filler in the aeration tank, and use it as the carrier of the biofilm. After being oxygenated, the wastewater to be treated flows through the packing at a certain flow rate and contacts with the biofilm, and the biofilm and the suspended activated sludge work together to purify the wastewater. Its total volume can satisfy the increased wastewater volume (3000m3/d) and water quality after anaerobic technology. The contact oxidation tank is divided into one and two stages in order to increase its purification effect.

The secondary sedimentation tank is provided with scraping equipment.

Recycled water refers to sewage that has been properly treated and used in other production processes within or outside the same water system. Recycled water is also called reused water. The reuse pool is a structure used to temporarily store the reused water, and has the function of regulating the water volume.

The middle pool is a bucket with a conical lower part. In order to avoid sand accumulation on the bucket wall, the cone angle is about 55°. The upper part of the bucket is provided with a steady flow ring and an overflow groove. The steady flow circle is in the middle of the pool. After the mortar enters the steady flow circle, the sand sinks in it, and the water entrained with the plaster and the fine sand is turned out from the bottom of the steady flow circle and flows into the overflow tank. The role of the intermediate tank is: (1) When the sewage passes through the intermediate tank, some of the sediment and suspended matter in the water will naturally settle down. After passing through several intermediate tanks, the final sewage is easier to handle. If there is no intermediate pool, it will be more difficult to deal with sewage directly, and the cost of treatment will be higher. (2) The main function is to adjust to ensure the uniformity and stability of the subsequent treatment. Generally, the sewage treatment process requires relatively stable water intake, which will have little impact on the entire treatment system and operate normally. (3) Adjust the water quality and quantity to ensure the uniformity and stability of the follow-up treatment. Generally, the sewage treatment process requires relatively stable water intake, which will have little impact on the entire treatment system and operate normally.

Adopt IC anaerobic reactor (existing technology), which is a new type of anaerobic reactor after UASB and EGSB. It divides the reactor into two upper and lower chambers through the upper and lower gas collecting hoods, and the two chambers are combined together by an internal circulation device. Most of the organic matter entering the IC anaerobic reactor is digested in the lower reaction chamber, and the generated biogas is blocked by the lower gas collecting hood and collected into the riser. Due to the density difference between the liquid inside and outside the riser, the fermentation broth is continuously lifted to gas-liquid separation. After the biogas is separated, it is returned to the lower reaction chamber, forming a continuous cycle of fermentation broth. Because the internal circulation occurs in the lower reaction chamber, the lower reaction chamber has a high hydraulic load. The high hydraulic load and high gas production load make the sludge and organic matter fully mixed, so that the sludge is in a fully expanded state, and the mass transfer rate is high. Increased anaerobic digestion rate and organic load. The upper reaction chamber is the low load area of the reactor, it only digests a small amount of organic matter that cannot be digested in the lower reaction chamber, and the biogas production is small. The gas production load is low, and the internal circulation does not enter the upper reaction chamber. The lower gas production load and lower hydraulic load of the upper reaction chamber are conducive to the sedimentation and retention of sludge, thereby maintaining a higher sludge concentration in the reactor.

Due to the internal circulation device, the IC anaerobic reactor changes the action direction of the gas production load and the hydraulic load, and can avoid the loss of sludge under high load. To a certain extent, the "high load and sludge loss phase separation" ”, so that the IC anaerobic reactor has a higher organic load than UASB and EGSB.

Deep processing technology

The filter unit adopts filter material KYL-2#. The filter material is mainly composed of special ceramsite filter material and active zeolite for water treatment. There are many pore diameters, uniform tubular channels and pores with large internal surface area, which have unique adsorption, screening, exchange of anions and cations, and catalytic properties. It can absorb ammonia nitrogen, organic matter and heavy metal ions in water, effectively reduce the toxicity of hydrogen sulfide at the bottom of the pool, adjust pH value, and increase dissolved oxygen in water.

Activated carbon is made from coal or wood and other materials through one-time carbonization. Due to the large surface area of activated carbon, the adsorption capacity is strong. Among all adsorbents, activated carbon has the strongest adsorption capacity. Using activated carbon as an adsorbent can remove organic matter, colloids, bacterial residues, microorganisms, etc. remaining in the water, and can decolorize and deodorize.

The wastewater is medium and high-concentration organic wastewater, and the removal efficiency of hydrolysis and facultative oxygen is not high, so it can be treated by anaerobic technology.

Processing effect

Claims (5)

1. one kind butchers field sewage disposal system, which is characterized in that including grid, rotary drum grid, oil partiting precipitation pool, the lattice Grid, rotary drum grid, oil partiting precipitation pool are sequentially connected, and the oil partiting precipitation pool is divided into three tunnels:

The first via: the upper layer of oil partiting precipitation pool is connect by oil sump with desiccation factory；

Second tunnel: the middle layer of oil partiting precipitation pool is connect with hydrolytic tank is adjusted, and is adjusted hydrolytic tank and is connect by elevator pump with flotation tank, Flotation tank passes sequentially through IC reactor, level-one contact-oxidation pool, two-stage biological contact oxidation pond are connect with secondary sedimentation tank；It is described secondary Sedimentation basin is connect with sludge concentration tank all the way, and it is anti-that another way successively passes through intermediate pool, filter, activated carbon adsorption layer and ozone Tower is answered to connect, the ozone reaction tower is connect with reuse pool；

Third road: oil partiting precipitation pool lower part is connect with sludge concentration tank, and the sludge concentration tank is connect with filter press.

2. one kind as described in claim 1 butchers field sewage disposal system, which is characterized in that the secondary sedimentation tank also passes through Reflux line and IC reactor.

3. one kind as described in claim 1 butchers field sewage disposal system, which is characterized in that the filter is KYL-2# type Filter.

4. one kind as described in claim 1 butchers field sewage disposal system, which is characterized in that the grid gap of the rotary drum grid is 1mm。

5. one kind as described in claim 1 butchers field sewage disposal system, which is characterized in that the level-one contact-oxidation pool, Two-stage biological contact oxidation pond is equipped with air blower.