How is slaughtering wastewater treated, and how is the wastewater from slaughterhouses generally tre

Slaughtering wastewater is generally reddish-brown and has an unpleasant fishy odor, which contains a large amount of blood, oil, fur, meat scraps, bone scraps, visceral impurities, undigested food, feces and other dirt, resulting in a high content of organic matter and solid suspended solids, and high concentration of organic matter is not easy to degrade. In addition, the biggest difference between it and other high-concentration organic wastewater is its high concentration of NH3-N, so the impact of NH3-N on wastewater treatment and its removal should be fully considered in the process design.

There are several methods of slaughterhouse wastewater treatment, generally aerobic biological treatment, natural ecological treatment, and chemical treatment. For a long time, people have relied on biological treatment, which is characterized by high ammonia nitrogen and phosphorus content, high moisture and large sludge volume in the production of sludge. The natural ecological treatment method is characterized by low energy consumption, low operating costs, and can be easily combined for operation.

The use of cationic polyacrylamide with other water treatment agents, the use of biological method, membrane method and other methods of treatment, by adding polyacrylamide flocculant to promote the solid-liquid separation of sludge in the slaughterhouse wastewater, and can effectively fuse and remove organic matter, in a short time can reduce the pollution load, not only can remove the COD, BOD, SS and ammonia nitrogen content in the wastewater, but also can decolorize this kind of wastewater, and make the organic matter screech and precipitate, reduce the harm of slaughterhouse meat product wastewater to the environment. Reduce the probability of nutrient of the surrounding water body, maintain the self-purification ability of the water body, and ensure the safety of the environmental water body and the hygiene of agricultural irrigation water quality. The process is simple, and the agent can be adjusted according to the change of water quality, which has a certain effect on deodorization, and has also become the preferred method for water treatment in many slaughterhouses.

The above is Henan Yuanda water purification material, hope.

At present, there are a variety of processes and equipment options for slaughtering wastewater treatment in China, and the detailed treatment steps will be slightly different for different treatment processes, but the basic process is unchanged. The following Qingzhiyuan environmental protection mainly talks about the basic process of integrated sewage treatment equipment:

Step 1: Because the slaughtering sewage contains a certain amount of large floating objects (blood, fur, sundries, etc.), it is intercepted with a grid to ensure the normal operation of the follow-up equipment, because the slaughtering sewage contains blood, oil and other macromolecular organic matter, it will be difficult to degrade directly into the aerobic, so the grid water enters the septic tank.

Step 2: The existing septic tank of the slaughterhouse can play a certain treatment effect, but the existing effluent concentration is still very high and some grease is entrained, in order to reduce the load of the subsequent treatment facility, it is considered to add a grease trap at the front end to remove the grease.

Step 3: Slaughterhouse because of the factor of working hours, its drainage cycle is different from other sewage discharge cycles, it is mainly concentrated in the night discharge, so a larger regulating tank must be set up to regulate the water quality and quantity to ensure the normal operation of the whole set of facilities, reduce the impact load on the follow-up facilities, sewage is collected through the regulating tank and then pumped into the follow-up treatment facilities by pumping.

Step 4: After the sewage is treated by the front-end septic tank, the sewage still contains most of the macromolecular organic pollutants, so it needs to be further degraded into small molecule substances to prepare for the subsequent aerobic biochemistry, and considering the excess of ammonia nitrogen and total phosphorus in the sewage, it is necessary to install an aerobic-anoxic alternate operating environment to achieve the alternating operation of nitrification-denitrification to achieve the effect of denitrification and phosphorus removal.

Step 5: The sewage enters the aerobic pond after the hydrolysis acidification tank, where the aerobic pond is divided into two sections, and its advantage is that in different aerobic sections, microorganisms present spatial distribution according to different environments, which is targeted and has a better removal effect. After the sewage is treated by various biochemical treatment facilities at the front end, the organic pollution load is degraded to a large extent.

However, it is still difficult to meet the standard of color in sewage, in order to remove the color, and at the same time consider the reduction of COD and the reduction of ammonia nitrogen and total phosphorus, so a coagulation sedimentation tank is set up here and targeted agents are added. The sedimentation tank comes out of the tank, enters the disinfection tank, and then finally discharges up to the standard.

Pretreatment + biochemical or MBR process, pretreatment can be carried out chemical flocculation and phosphorus removal treatment, and then through the process, because the slaughtering process will have animal oil and excrement, fur and other substances, through the preliminary demulsification and oil removal and removal of suspended solids, total phosphorus, etc., this step can mainly use demulsification flocculant.

Slaughterhouse wastewater contains a large amount of blood, fur, minced meat, offal debris, undigested food and feces and other pollutants, which are not disposed of in time to produce foul odors, and the wastewater quality is difficult to treat. Therefore, it is recommended to use demulsifier to deemulsify the oils and fats in the wastewater first, and flocculate and precipitate the impurities in the wastewater, which can solve the problems of color and COD in the wastewater. In addition, this type of wastewater can be very smelly, so it is recommended to use deodorants to solve the problem of odor in wastewater

The general slaughtering wastewater can be pretreated first and then added with biochemistry, and the pretreatment can add demulsifier for flocculation and precipitation, because the slaughtering wastewater generally contains oil, which is difficult to biodegrade.

Slaughtering sewage is an organic wastewater that is easily biodegradable, with high BOD and COD indexes, and obvious suspended solids, so the treatment of this kind of wastewater is the first:

After the grid, sedimentation tank, remove relatively large solids, sediment, etc.

After the aeration conditioning tank, coagulation air flotation and other processes to remove the fine suspended solids in the wastewater.

Finally, it meets the emission standard after aerobic and precipitation.

The most important thing is to use a demulsifier, which is added to the pretreatment end of the process, which can effectively remove most of the suspended solids and total phosphorus, etc., and reduce the pressure for the subsequent biochemistry.

According to the current policy, slaughterhouses that only slaughter without pre-cooling are no longer subject to Huai Tu's approval.

In the process of slaughtering and meat processing, a large amount of water is consumed, and at the same time, wastewater containing contaminants such as blood, oil, wool, meat scraps, livestock and poultry offal, undigested food and feces must be eliminated, and such wastewater also contains a large number of microorganisms that are harmful to human health. If the meat processing wastewater is discharged directly without treatment, it will cause serious pollution to the water environment and cause harm to the health of humans and animals.

Characteristics of slaughtering wastewater:

It has the characteristics of large water volume, uneven drainage, high concentration, many impurities and suspended solids, and good biodegradability. At the same time, the biggest difference compared to other high-concentration organic wastewater is its high concentration of NH3-N (about 120 mg L).

The slaughtering wastewater treatment process is pretreatment (regulation, grid, air flotation machine, etc.), and the daily water volume is adjusted by the regulating tank, so that the neutralization and fusion of the biochemical pool are entered, and the grid is mainly for some hair, visceral residues and other large particulate matter to intercept and clean up, which has a certain effect on reducing suspended solids.

The air flotation machine is mainly used to dispose of some fine suspended solids, greases and blood lipids in the water. At the same time, the air flotation machine also has a certain removal efficiency for COD, which improves the biochemical tank of wastewater.

The above content reference: Encyclopedia - Slaughtering wastewater.

It can be treated by collection-chemical-solid-liquid separation-biochemical treatment-disinfection.

Slaughtering sewage treatment process:

After removing large particles of suspended solids and short fibers through the grid, the wastewater enters the pre-exposure conditioning tank to adjust the water volume and homogenize the water quality, and at the same time, a small amount of aeration in the regulating tank makes the wastewater fully mixed and reduces sludge sedimentation. The pump is then lifted into the high-efficiency air flotation device to remove fine suspended particles, oil slicks and insoluble organic matter in the water. After the wastewater flows into the hydrolysis tank, the macromolecular organic matter in the water is hydrolyzed and acidified into small molecule organic matter under the action of anaerobic bacteria, and most of the insoluble organic matter is degraded into dissolved substances, which improves the biodegradability of the sewage, and at the same time degrades the solid organic matter to reduce the amount of sludge to achieve the effect of denitrification and phosphorus removal.

After entering the contact oxidation tank, activated sludge and active aerobic biological strains are added, and the biological strains can be contacted and domesticated in this device; The built-in orderly aerobic system uses the water flow control and regeneration function of the system to achieve biodegradation, replacing the traditional contact oxidation, forming a special biochemical sewage treatment system to efficiently remove COD and BOD5 in the water. The effluent of the biological contact oxidation tank contains the shedding biofilm and the inorganic suspended particles brought in by the wastewater, which must be separated by slurry water through the secondary sedimentation tank. The clean water discharged from the secondary sedimentation tank has reached the discharge standard except for the coliform bacteria exceeding the standard, so the clean water must be disinfected, and the effluent is disinfected with chlorine dioxide, and the effluent fully meets the discharge requirements after disinfection, and is discharged through the sewage outlet.