Hello teacher, how to deal with slaughtering sewage

Slaughtering wastewater treatment process:

Slaughtering wastewater wastewater through the grid to remove large particles of suspended solids and short fibers into the pre-exposure conditioning tank to regulate the water volume, homogenize the water quality, at the same time in the conditioning tank a small amount of aeration to fully mix the wastewater, reduce sludge deposition. 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 excessive coliform bacteria, so the clean water must be disinfected.

Guangzhou Lvye environmental protection gives you advice.

Can I be treated with sewage treatment chemicals, which city are you in?

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.

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.