CN217351069U

CN217351069U - Slaughter effluent treatment plant

Info

Publication number: CN217351069U
Application number: CN202120891463.7U
Authority: CN
Inventors: 左小龙; 贺开明; 雷刚; 杨全
Original assignee: Chengdu Dingyang Environmental Protection Technology Co ltd
Current assignee: Chengdu Dingyang Environmental Protection Technology Co ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2022-09-02
Anticipated expiration: 2031-04-26

Abstract

A slaughter wastewater treatment device comprises a pretreatment device, an anaerobic treatment device, an anoxic treatment device, an aerobic treatment device and a subsequent treatment device which are connected in sequence through pipelines. As the mixed liquid in the anoxic tank partially flows back to the sewage regulating tank through the mixed liquid reflux pump 1, nitrobacteria in the sewage regulating tank are added, and the primary treatment capacity is enhanced; because the excess sludge is returned to the sewage regulating tank, the destabilization and adsorption coagulation effects of the sludge on the suspended colloid are improved, and the reinforced air flotation is performed to remove suspended matters and COD in the sewage; the invention increases the mixed liquid of the aerobic pool to flow back to the inlet section and the middle section of the anoxic pool through the mixed liquid reflux pump 2, thereby improving the ammonia nitrogen treatment effect. The device of the utility model has the advantages of strong capability of adapting to the change of the water quality of the wastewater, convenient operation and adjustment, good water quality treatment effect, and the like.

Description

Slaughter effluent treatment plant

Technical Field

The utility model discloses a be applicable to slaughter waste water, sewage treatment fields such as meat products processing waste water and beasts and birds breed waste water, domestic sewage and medical sewage.

Background

A large amount of waste water is generated in the slaughtering process, and organic matters such as animal waste, blood, animal internal organ sundries, animal hair, skin and meat, grease and the like belong to high-concentration organic waste water and have strong fishy smell. The content of organic matters and suspended matters in water is high, the water is easy to decay, the water quality is deteriorated, the concentration of ammonia nitrogen is high, and the ammonia nitrogen is harmful to human bodies and the environment if the ammonia nitrogen is directly discharged without being treated.

The slaughterhouse wastewater has the following characteristics:

firstly, slaughter sewage is generally red brown and has pungent fishy smell, which contains a large amount of blood dirt, grease, hair, meat scraps, bone scraps, visceral impurities, undigested things, excrement and other dirt, and has high suspended solid content, high chroma and easy stink.

② the slaughter sewage mainly contains dissolved organic matters containing nitrogen and phosphorus with higher concentration, COD _cr 、BOD ₅ High content of ammonia nitrogen and COD _cr At 1400-2200mg/l, BOD ₅ 800-1200mg/l, 600-1000mg/l suspended matter SS, 100-200mg/l ammonia nitrogen; the biodegradability is good, the high-concentration degradation-resistant organic polluted wastewater is high in standard treatment difficulty, and the environment is seriously polluted without treatment.

The technology for treating slaughter wastewater generally comprises A ² O and improved A ² The technology of/O, SBR and improved technology, sequencing batch biological treatment, physical and chemical treatment, natural treatment, etc. exist in different degrees in practice to treat COD in effluent _cr 、BOD ₅ And the ammonia nitrogen index exceeds the standard.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem of effluent COD existing in the slaughter wastewater treatment process _cr 、BOD ₅ The invention provides a slaughter wastewater treatment device, which solves the problems that ammonia nitrogen indexes exceed standards and the like.

The slaughter wastewater treatment device mainly comprises pretreatment, anaerobic treatment, anoxic treatment, contact aerobic treatment and subsequent treatment.

The pretreatment is to the impurity that contains animal hair, kicks shell, fat granule etc. in the slaughtering waste water, sets up mechanical grid equipment, gets rid of the suspended solid in the waste water and floats impurity. Aiming at the characteristic of high oil content in the wastewater, an oil separation grit chamber is arranged to remove the oil, sand grains, broken bones and the like which are insoluble in the wastewater. A part of returned sludge and the mixed liquid of the anoxic tank are added aiming at the regulating water tank to form an anoxic environment for denitrification pretreatment, so that the subsequent denitrification load is reduced. Aiming at slightly soluble grease, colloid, animal blood and the like in the wastewater, the coagulant and the flocculant are added for fully stirring and mixing, the colloid and dissolved organic matters in the wastewater are destabilized and removed by micro-bubble adsorption and condensation formed in an air floatation device. Aiming at the condition of low temperature in winter and low biochemical treatment efficiency of wastewater, a heater is arranged to heat the wastewater to 18-24 ℃ in the low-temperature environment in winter.

According to the invention, according to A ² the/O biochemical treatment process is provided with an anaerobic tank, an anoxic tank and an aerobic tank. One of the innovation points is that a part of the mixed liquid in the anoxic tank flows back to the anaerobic tank through the internal circulation pump 1 to form mixed liquid internal circulation r1 with the reflux ratio of 100-150%, and a part of the mixed liquid flows back to the sewage adjusting tank to form mixed liquid internal circulation r 1' with the reflux ratio of 10-50%, and the reflux ratio is adjusted through a flowmeter and a control valve; the second innovation point is that the mixed liquid in the aerobic tank flows back to the anoxic tank through the internal circulating pump 2 to form mixed liquid internal circulation r2, the reflux ratio is 50-150%, and the reflux ratio is adjusted through a flowmeter and a control valve; the third innovation point is that the sludge in the sedimentation tank partially flows back to the anaerobic tank through a sludge pump to form a sludge backflow R, the backflow ratio is 50-150%, the partial sludge flows back to the sewage adjusting tank to form a sludge backflow R', the backflow ratio is 10-50%, and the backflow proportion is adjusted through a flowmeter and a control valve.

As the mixed liquid in the anoxic tank flows back a part of the mixed liquid to the sewage regulating tank through the internal circulating pump 1, nitrobacteria in the sewage regulating tank are added, and the primary treatment capacity is enhanced; because the excess sludge is returned to the sewage regulating tank, the destabilization and adsorption coagulation effects of the sludge on the suspended colloid are improved, and the reinforced air flotation is performed to remove suspended matters and COD in the sewage; the invention increases the mixed liquid of the aerobic pool to flow back to the inlet section and the middle section of the anoxic pool through the internal circulating pump 2, thereby improving the ammonia nitrogen treatment effect.

Drawings

FIG. 1 is a structural diagram of the present invention

FIG. 2 is a structural system diagram of an embodiment of the present invention

In fig. 2, 1 is a grid well, 2 is a grid, 3 is an oil separation grit chamber, 4 is a sewage adjusting tank, 5 is a sewage lifting pump, 6 is a coagulant adding device, 7 is a mixing and stirring tank, 8 is a high-efficiency air flotation device, 9 is a heater, 10 is an anaerobic tank, 11 is an anoxic tank, 12 is an aerobic tank, 13 is an air blower room, 14 is an air blower, 15 is a sedimentation tank, 16 is a disinfection tank, 17 is a sodium hypochlorite disinfection liquid adding device, 18 is a sludge tank, 19 is a slurry pump, 20 is a filter press, 21 is a sludge reflux pump, 22 is a mixed liquid reflux pump, 23 is a mixed liquid reflux pump, and 24 is a grit chamber sludge discharge pump.

Detailed Description

The slaughter wastewater treatment device consists of a pretreatment part, an anaerobic treatment part, an anoxic treatment part, a contact aerobic treatment part and a subsequent treatment part. Parameter calculation is carried out according to indexes of water quantity, inlet water quality and outlet water quality of slaughter wastewater, a mechanical grid is arranged in a pretreatment system, and impurities such as hair, kicking shells, chippings and meat particles of animals in the wastewater are intercepted and removed through the grid; the effluent enters an oil separation tank, oil floats upwards to be separated by utilizing the difference of specific gravity between the oil and the wastewater, the separated floating oil flows to a waste oil tank to be periodically removed, and the sediment deposited at the bottom is periodically discharged to a sludge concentration tank; the effluent enters a sewage adjusting tank to adjust the water quantity of the slaughter wastewater at different time intervals, so that the water quality is homogenized. The effluent of the regulating tank enters a mixing reaction tank and a high-efficiency air flotation tank, and colloidal substances in the wastewater are destabilized and condensed by adding a coagulant and are removed by micro-bubble adsorption air flotation.

The pretreated wastewater enters an anaerobic tank for hydrolytic acidification, and long-chain high-molecular organic matters are hydrolyzed and broken into low-molecular and small-molecular substances such as organic acid by virtue of acidification bacteria; the effluent of the anaerobic tank enters an anoxic tank, is mixed with the reflux mixed liquor of the aerobic tank and the reflux sludge of the sedimentation tank, and in an anoxic state, denitrifying bacteria obtain sufficient electrons for denitrification to achieve the aim of denitrification, wherein the denitrifying bacteria at the tail end of the anoxic tank flow back to the anaerobic tank through reflux liquid to form r1 and flow back to a sewage regulating tank r 1'; the effluent of the anoxic tank enters a contact aerobic tank, under the environment of aeration and oxygenation, aerobic bacteria, microorganisms and other sufficient nutrients decompose and absorb organic matters, ammonia nitrogen is converted into nitrate nitrogen, and the nitrate nitrogen returns to the inlet section and the middle section of the anoxic tank along with reflux liquid at the tail end to form internal circulation r 2; and (3) the effluent of the contact aerobic tank enters a secondary sedimentation tank for mud-water separation, clear water is discharged to the contact disinfection tank for disinfection treatment, part of sludge in the secondary sedimentation tank flows back to the anaerobic tank R through a sludge pump, part of sludge flows back to the sewage regulating tank R', and the rest sludge is discharged to a sludge concentration tank. The flow rate and reflux ratio of reflux liquid are regulated by means of flow meter and control valve.

The main control parameters are as follows:

temperature of sewage: the growth temperature of the microorganism is 18-28 ℃, the growth of mesophilic bacteria is stopped when the temperature is lower than 8 ℃, and the growth of low-temperature bacteria is stopped when the temperature is lower than 5 ℃.

② PH value of sewage: the pH value of the anaerobic pool is more than 7.2 and more than 6.8, the methanogen is seriously inhibited when the pH value is less than 6.5 or more than 8.2, and the nitration reaction is stopped. When the pH value of the aerobic pool is more than 8.5 and is more than 6.5 and is less than 4.5 or more than 8.5, the sludge is expanded by the filamentous fungi.

③ Dissolved Oxygen (DO): the anaerobic is lower than 0.1mg/l, the anoxic pond is lower than 0.5mg/l, and the aerobic pond is 2.0-3.0 mg/l.

Oxidation-reduction potential: the anaerobic property is less than +100mv, and the strict anaerobic state is controlled to be-100 mv to-300 mv; hypoxia is-100 mv to +100 mv; aerobic +300mv to +400 mv.

The reflux ratio is as follows: the total reflux ratio of the mixed liquid is 200-300%, and the total reflux ratio of the sludge is 50-200%. When the concentration of the pollutants is high, a high reflux ratio is adopted, and when the concentration of the pollutants is low, a low reflux ratio is adopted, and the regulation is carried out according to the water quality change condition of the sewage inlet and outlet water.

The application range is as follows: the device is suitable for treating slaughter house sewage, meat processing factory sewage, livestock and poultry farm sewage, domestic sewage and medical sewage.

The slaughtering wastewater with daily average sewage amount less than 200 cubic meters can be manufactured into a steel structure integrated complete device, the slaughtering wastewater with target average sewage amount more than 200 cubic meters can be manufactured into a reinforced concrete structure sewage treatment facility, and corresponding equipment, a water pump, a slurry pump, a pipeline, a control valve, a flow meter, an electric control system and the like are configured.

FIG. 2 shows a structural system diagram of a specific embodiment of the present invention, slaughtering wastewater is discharged from slaughtering room, flows through a blow-off pipe to a grid well 1, and enters an oil separation grit chamber 3 through a grid 2 to remove animal hair, hoof shells and the like, the grease with light density floats upwards and gathers under the action of gravity after the flow velocity is reduced, the silt with large specific gravity is deposited, the deposited silt is discharged to a silt concentration tank 18 through a dredge pump 24 periodically, the sewage enters an adjusting tank 4 to adjust the water yield and equalize the water quality, the mixture is mixed with the returned residual sludge and the sludge in an anoxic tank, the mixture is conveyed to a mixing and stirring tank 6 through a sewage lifting pump 5, a coagulant is added through a coagulant adding device 7, the mixture enters a high-efficiency air flotation device 8 to adsorb and gather micro bubbles to form large-particle scum, the scum is scraped out through a scum scraping machine, clear water enters an anaerobic tank 10 through a pipeline, the temperature in winter is lower than 15 ℃, the pipeline is opened for heating, 9 heating the sewage to 18-24 ℃, hydrolyzing and acidifying the sewage in an anaerobic tank by anaerobic bacteria, breaking chains of high molecular organic matters to decompose the high molecular organic matters into low molecular substances and organic acid, feeding the effluent into an anoxic tank 11, performing denitrification reaction in an anoxic state, converting nitrate into nitrogen to discharge a liquid phase, feeding the effluent into an aerobic tank 12, oxygenating the aerobic tank by a blower station 13 through a roots blower 14 to provide dissolved oxygen DO for aerobic bacteria, microorganisms and lower organisms, digesting and absorbing the organic matters in the waste water under the action of the aerobic bacteria and the lower organisms, feeding the effluent into a sedimentation tank 15 for sludge-water separation, discharging the effluent into a disinfection tank 16, adding a solution into a disinfection solution adding device 17 to disinfect solution, discharging the effluent to reach the standard through a drainage well, refluxing the sludge in the sedimentation tank to an inlet section of the anaerobic tank by a sodium hypochlorite reflux pump 21, wherein the reflux ratio is about 50-150%, and refluxing a part of the effluent to a sewage regulating tank, the reflux ratio is 10-50%, the excess sludge is discharged to a sludge concentration tank 18 through the regulation of a control valve, the excess sludge is pressurized and sent to a chamber filter press 20 through a slurry pump 19, the dewatered sludge is periodically transported outwards, the filtered water returns to a sewage regulation tank for retreatment, the tail section of an aerobic tank 12 returns to the front section of an anoxic tank 11 through a mixed liquid reflux pump 22, the tail section of the anoxic tank 11 returns to the water inlet section of an anaerobic tank 10 through a mixed liquid reflux pump 23, and a part of the filtered water returns to the water inlet section of the sewage regulation tank 4, so that the pretreatment effect of the sewage regulation tank 4 is enhanced.

Claims

1. The utility model provides a slaughter effluent treatment plant, includes preliminary treatment, the anaerobism pond, the oxygen deficiency pond, contact good oxygen pond and sequent processing are constituteed, its characterized in that oxygen deficiency pond end is linked together through connecting tube and anaerobism pond import section, still is linked together through connecting tube and sewage equalizing basin simultaneously, makes the mud of oxygen deficiency pond mix the liquid and flows back to the anaerobism pond through internal circulating pump and intercommunication pipeline, still gets back to the sewage equalizing basin simultaneously, and the backward flow proportion of mud mixed liquid is adjusted through the control valve on the intercommunication pipeline.

2. The slaughter wastewater treatment plant according to claim 1, wherein the end section of the aerobic tank is communicated with the inlet section of the anoxic tank through a connecting pipeline, so that sludge mixed liquor in the aerobic tank flows back to the anoxic tank through the internal circulating pump and the communicating pipeline, and the return ratio of the sludge mixed liquor is adjusted through a control valve on the communicating pipeline.

3. The slaughtering wastewater treatment device according to claim 1 and claim 2, wherein the sedimentation tank is communicated with the inlet section of the anaerobic tank through a communicating pipeline and is also communicated with the sewage adjusting tank through a communicating pipeline, so that residual sludge in the sedimentation tank flows back to the water inlet section of the anaerobic tank through the sludge pump and the communicating pipeline, and a part of residual sludge flows back to the sewage adjusting tank to pretreat and strengthen sewage in the adjusting tank, and the backflow proportion of the residual sludge is adjusted through a control valve on the communicating pipeline.