Anaerobic front slaughter wastewater treatment system

Abstract

The utility model discloses an anaerobic front-mounted slaughter wastewater treatment system which sequentially comprises a pretreatment unit, a biochemical reaction unit and a sludge treatment unit according to a process treatment sequence, and the biochemical reaction unit comprises an anoxic tank, an aerobic tank and a sedimentation tank which are sequentially communicated; return pipelines communicated with the anoxic tank are respectively arranged on the aerobic tank and the sedimentation tank; the sludge treatment unit comprises a sludge tank and a sludge dewatering machine, and the pretreatment unit comprises a mechanical grating, an anaerobic tank, an adjusting tank, a drum screen and an air flotation machine which are communicated in sequence; the system has the advantages of being low in cost, high in efficiency, good in stability, simple in structure, high in speed and the like, the stability of water quality can be improved through the pretreatment unit provided with the double-interception structure and the front anaerobic tank, and guarantees and excellent conditions are provided for effective treatment of subsequent biochemical reaction; the problems of poor stability and low treatment efficiency of an existing traditional process are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of slaughterhouse wastewater treatment, in particular to an anaerobic front-end slaughterhouse wastewater treatment system. Background Art

[0002] Slaughterhouse wastewater mainly comes from pen washing, pre-slaughter washing, post-slaughter scalding or skinning, opening, splitting, disintegration, viscera washing and workshop washing. Wastewater is mainly composed of blood, grease, minced meat, animal hair, undigested food and feces, urine, clean washing water, etc. generated during the production process.

[0003] Since the slaughtering process is relatively concentrated, the instantaneous fluctuation of the amount of slaughtering wastewater is large. The existing traditional slaughtering wastewater treatment process usually only includes screen filtration + flotation + biological treatment + sludge transportation process. When this traditional process is used to treat slaughtering wastewater, due to the instantaneous fluctuation of water volume, it is not only easy to cause frequent equipment blockages and failures, but also easy to cause shocks to the system, affecting the normal operation of the system. In addition, due to the instability of water quality, on the one hand, the effluent water quality does not meet the standards and cannot meet the requirements of (GB13457-92) "Meat Processing Industry Water Pollutant Emission Standards". On the other hand, the amount of medicine cannot be accurately added, resulting in waste of medicine and environmental pollution.

[0004] There is currently no effective solution to the above problems. Summary of the invention

[0005] The utility model aims to provide an anaerobic front-end slaughterhouse wastewater treatment system, which has a simple structure, low operating cost, high treatment efficiency and good stability, and solves the problems of poor stability and low treatment efficiency in existing traditional processes.

[0006] In order to solve the above problems, the present application provides an anaerobic pre-slaughterhouse wastewater treatment system, which includes a pretreatment unit, a biochemical reaction unit and a sludge treatment unit in sequence according to the process treatment order. The biochemical reaction unit includes an anoxic tank, an aerobic tank and a sedimentation tank connected in sequence, and a return pipeline connected to the anoxic tank is respectively provided on the aerobic tank and the sedimentation tank; the sludge treatment unit includes a sludge tank and a sludge dewatering machine, and the pretreatment unit includes a mechanical screen, an anaerobic tank, a regulating tank, a rotary drum screen and an air flotation machine connected in sequence.

[0007] As a preferred embodiment of the present application, at least a pH regulator, a coagulant and a coagulant aid are transported in the flotation machine.

[0008] As a preferred embodiment of the present application, the regulating tank is connected to the rotary drum screen through a lifting mechanism.

[0009] As a preferred embodiment of the present application, the sludge dewatering machine is provided with a filtrate conveying pipeline connected to the anaerobic tank.

[0010] As a preferred embodiment of the present application, at least a coagulant, a pH regulator and an anti-foaming agent are transported inside the sludge tank.

[0011] As a preferred embodiment of the present application, the sludge dewatering machine is a screw stacking machine.

[0012] Compared with the prior art, the advantages of the anaerobic front-end slaughterhouse wastewater treatment system of the present application are:

[0013] (1) This treatment system places the anaerobic tank in the traditional biochemical reaction unit in front of the pretreatment unit. The pre-placed anaerobic tank can perform anaerobically fermented sewage after coarse filtration by the mechanical screen. In this way, on the one hand, anaerobic microorganisms can decompose and transform some organic matter, degrading organic waste into simple organic matter, gas and a small amount of organic acid, thereby reducing the content of organic matter in the water and achieving and maintaining the stability of water quality. On the other hand, it is also conducive to the reproduction and metabolism of anaerobic microorganisms, providing favorable conditions for the subsequent treatment of wastewater in the biochemical reaction unit.

[0014] (2) Double interception design, with a front mechanical screen and a rear drum screen, both of which operate automatically to automatically lift slag and unload materials. The mechanical screen mainly intercepts pollutants such as large pieces of minced meat, while the rear screen focuses on intercepting hair, etc. The double interception design effectively ensures the normal operation of subsequent mechanical equipment and reduces the blockage failure rate during equipment operation.

[0015] (3) The pre-anaerobic tank cooperates with the regulating tank to adjust water volume fluctuations and effectively alleviate instantaneous impacts. At the same time, the dosage of the drug can be adjusted to meet the current water quality requirements and achieve precise control of the dosage of the drug.

[0016] (4) Carbon removal and nitrogen removal adopts the highly efficient A / O process, which is mature, stable and easy to operate.

[0017] (5) The sludge dewatering process is realized by using sludge conditioning + screw stacking machine dewatering, which has low operating costs, can operate stably for a long time, is simple to operate manually, and has low workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a process flow chart of the anaerobic front-end slaughterhouse wastewater treatment system provided by the utility model.

[0019] Reference numerals

[0020] Anoxic tank 1, aerobic tank 2, sedimentation tank 3, return pipeline 4, sludge tank 5; sludge dewatering machine 6; mechanical screen 7; anaerobic tank 8; regulating tank 9; drum screen 10; flotation machine 11; filtrate delivery pipeline 12; disinfection tank 13. DETAILED DESCRIPTION

[0021] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0022] like Figure 1 As shown, it is a process flow chart of an anaerobic front-end slaughterhouse wastewater treatment system provided in this embodiment. The utility model is now further explained in conjunction with the accompanying drawings and specific implementation methods.

[0023] In this embodiment, the anaerobic pre-type slaughterhouse wastewater treatment system includes a pretreatment unit, a biochemical reaction unit and a sludge treatment unit in order of process sequence, and the units are connected in sequence. Among them, the pretreatment unit includes a mechanical grille 7, an anaerobic tank 8, a regulating tank 9, a drum screen 10 and a flotation machine 11 connected in sequence, and the biochemical reaction unit includes an anoxic tank 1, an aerobic tank 2 and a sedimentation tank 3 connected in sequence, and a return pipeline 4 connected to the anoxic tank 1 is respectively provided on the aerobic tank 2 and the sedimentation tank 3; the sludge treatment unit includes a sludge tank 5 and a sludge dewatering machine 6.

[0024] In this embodiment, the pretreatment unit serves as the starting process for the treatment of slaughter wastewater, and comprises a mechanical grille 7, an anaerobic tank 8, an adjusting tank 9, a drum screen 10 and an air flotation machine 11 which are connected in sequence through pipelines or lifting mechanisms. In this embodiment, the adjusting tank 9 is preferably connected to the drum screen 10 through a lifting mechanism. According to the above structure, the pretreatment unit adopts a double interception design, and the anaerobic tank 8 traditionally located in the biochemical reaction unit is placed in front. In the double interception design, the front mechanical grille 7 and the rear drum screen 10 are both automatically operated to automatically lift slag and unload materials. The mechanical grille 7 is used to intercept larger debris such as large pieces of minced meat to achieve coarse filtration, and the drum screen 10 is used to intercept smaller solid debris such as hair to achieve fine filtration. The double interception design effectively ensures the normal operation of subsequent mechanical equipment and reduces the blockage failure rate. At the same time, in this embodiment, the anaerobic tank 8 The pre-filter can perform anaerobic fermentation on the sewage after the coarse filtration of the mechanical screen 7. The anaerobic fermentation method can utilize anaerobic microorganisms to decompose and transform some organic matter, degrade organic waste into simple organic matter, gas and a small amount of organic acid, etc., thereby reducing the content of organic matter in the water, achieving and maintaining the stability of water quality, and thus facilitating the precise addition of reagents. On the other hand, it is also conducive to the reproduction and metabolism of anaerobic microorganisms, providing favorable conditions for the subsequent treatment of wastewater in the biochemical reaction unit; in addition, the pre-filtered anaerobic tank 8 cooperates with the regulating tank 9 to adjust the water volume fluctuation and effectively alleviate the instantaneous impact. At the same time, because the pre-filtered anaerobic tank 8 has the function of adjusting the water quality stability, it cooperates with the regulating tank 9 to accurately adjust the amount of reagents to meet the current water quality requirements, effectively saving the amount of reagents, and avoiding the environmental pollution caused by excessive reagents and the problem of low sewage treatment efficiency.

[0025] In this embodiment, the sewage flows by gravity through the drum screen 10 into the flotation machine 11. The flotation machine 11 adopts the existing traditional flotation machine 11 with a scraper structure, and a pH regulator, a coagulant and a coagulant aid are transported in the flotation machine 11. The pH regulator can be an alkali, which is used to effectively adjust the pH value of the sewage and thus achieve water quality regulation. The coagulant is preferably commonly used aluminum hydroxide. Hydroxide) is mainly used to neutralize negatively charged particles in the wastewater and make them condense into larger clusters. At the same time, the aluminum hydroxide can also react chemically with silicates and other substances in the wastewater, which is helpful to remove suspended matter and colloids in the wastewater. In combination with a coagulant aid and using the fine bubbles generated by the air flotation machine 11, the fine suspended matter, grease, colloids, etc. generated by coagulation can be attached to the air bubbles and float to the water surface with the bubbles to form scum. Then, the scraper provided by the air flotation machine 11 is used to scrape the scum out of the water surface to the sludge pool 5, so as to remove suspended matter, colloids and grease in the wastewater and realize the preliminary purification of the water quality. The remaining wastewater in the air flotation machine 11 flows into the biochemical reaction unit by gravity.

[0026] The biochemical reaction unit comprises an anoxic tank 1, an aerobic tank 2 and a sedimentation tank 3 which are connected in sequence through pipelines or lifting mechanisms, and a return pipe 4 connected to the anoxic tank 1 is respectively provided on the aerobic tank 2 and the sedimentation tank 3; that is, the biochemical reaction unit is an existing conventional A / O process, which is mature, stable and easy to operate. The sewage treated by the front anaerobic tank 8 flows into the anoxic tank 1 (A tank) and the aerobic tank 2 (O tank) by gravity through the flotation machine 11 to further decompose the organic matter more thoroughly, and remove ammonia nitrogen by the action of nitrifying bacteria and denitrifying bacteria, thereby achieving the purpose of denitrification and carbon removal.

[0027] In this embodiment, the mud-water mixture in the aerobic tank 2 flows by gravity into the sedimentation tank 3 for mud-water separation. A portion of the mud-water mixture in the sedimentation tank 3 flows back to the anoxic tank 1 to ensure that the concentration in the anoxic tank 1 meets the requirements, and the remaining part is subjected to mud-water separation. The sludge is discharged into the sludge tank 5, and the supernatant flows by gravity into the disinfection tank 13, and is discharged after being disinfected to meet the standards by adding disinfectant.

[0028] The sludge treatment unit includes a sludge tank 5 and a sludge dewatering machine 6, wherein the sludge tank 5 receives the sludge from the sedimentation tank 3 and dewaters the sludge through the sludge dewatering machine 6, and the filtered liquid flows back into the anaerobic tank 8 to provide nutrients required for the growth and metabolism of microorganisms in the anaerobic tank 8, thereby increasing the activity and quantity of microorganisms in the anaerobic tank 8, and the solid dry sludge is transported out.

[0029] In order to achieve better dehydration effect, the present embodiment preferably transports coagulants, pH regulators and antifoaming agents inside the sludge pool 5. The regulator composed of the coagulant, pH regulator and antifoaming agent can promote the aggregation and coagulation of tiny particles in the sludge to form larger clusters, which makes it easier to dehydrate and separate, improves dehydration efficiency, and reduces processing time and energy consumption.

[0030] In this embodiment, the sludge dewatering machine 6 is preferably a snail stacking machine, which has the advantages of efficient dehydration, energy saving, small footprint, stable operation and wide applicability, and meets the needs of this embodiment; this embodiment adopts sludge conditioning + snail stacking machine dehydration to realize the sludge dehydration process, which has low operating cost, can run stably for a long time, is simple to operate manually, and has low workload

[0031] The use principle of this embodiment includes: the slaughter wastewater passes through the mechanical screen 7, the anaerobic tank 8, the regulating tank 9, the drum screen 10, the flotation machine 11, the anoxic tank 1, the aerobic tank 2, the sedimentation tank 3, the sludge tank 5 and the sludge dewatering machine 6 in sequence. Compared with the existing treatment process, the anaerobic pre-type slaughter wastewater treatment system not only has the advantages of low cost, high efficiency, good stability, simple structure, and fast speed, but also can increase the stability of water quality by providing a pretreatment unit with a double interception structure and a pre-anaerobic tank 8, providing guarantee and excellent conditions for the effective treatment of subsequent biochemical reactions, and solving the problems of poor stability and low treatment efficiency in the existing traditional process; in addition, the design of the double interception structure and the pre-anaerobic tank 8 ensures that the treated water quality can meet the requirements of (GB 13457-92) "Water Pollutant Emission Standard for Meat Processing Industry" while avoiding the pollution of the environment by excessive dosage of drugs.

[0032] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the premise of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An anaerobic front-end slaughterhouse wastewater treatment system, comprising a pretreatment unit, a biochemical reaction unit and a sludge treatment unit in the order of process treatment, wherein the biochemical reaction unit comprises an anoxic tank (1), an aerobic tank (2) and a sedimentation tank (3) which are connected in sequence, and a return pipeline (4) which is connected to the anoxic tank (1) is provided on the aerobic tank (2) and the sedimentation tank (3), respectively; the sludge treatment unit comprises a sludge tank (5) and a sludge dewatering machine (6), characterized in that: The pretreatment unit comprises a mechanical grid (7), an anaerobic tank (8), a regulating tank (9), a rotary drum screen (10) and an air flotation machine (11) which are connected in sequence.

2. The anaerobic front-end slaughterhouse wastewater treatment system according to claim 1, characterized in that: At least a pH regulator, a coagulant and a coagulant aid are transported in the air flotation machine (11).

3. The anaerobic front-end slaughterhouse wastewater treatment system according to claim 1, characterized in that: The regulating tank (9) is connected to the rotary drum screen (10) via a lifting mechanism.

4. The anaerobic front-end slaughterhouse wastewater treatment system according to claim 1, characterized in that: The sludge dewatering machine (6) is provided with a filtrate conveying pipeline (12) which is in communication with the anaerobic tank (8).

5. The anaerobic front-end slaughterhouse wastewater treatment system according to claim 1, characterized in that: At least a coagulant, a pH regulator and an anti-foaming agent are transported inside the sludge tank (5).

6. The anaerobic front-end slaughterhouse wastewater treatment system according to claim 1, characterized in that: The sludge dewatering machine (6) is a screw stacking machine.

Images