Advanced Treatment Methods of Slaughtering Wastewater

Status of slaughtering wastewater pollution
Slaughter wastewater mainly comes from slaughtering industries such as animal husbandry, poultry and fish. With the improvement of people's living standards in recent decades, the slaughtering industry has achieved unprecedented expansion and development, and the discharge of wastewater has also continued to increase. 

Characteristics of slaughtering wastewater
The characteristics of wastewater are as follows:
The main components of wastewater are animal blood, grease, feces, visceral debris and inorganic salts.
(1) High COD, generally above 2000mg/L;
(2) High SS, mainly containing a large amount of suspended solids such as bristles;
(3) High ammonia nitrogen, animal manure water and animal protein contain a lot of ammonia nitrogen;
(4) High oil and fat, a large amount of animal fat is produced during the slaughtering process.

Slaughter wastewater treatment technology

In the slaughtering wastewater treatment process, aerobic treatment, anaerobic treatment and chemical flocculation treatment have their own advantages and disadvantages.

Generally, when treating slaughter wastewater with lower concentration (CODcr≤1000mg/L), biological treatment can be directly used, which can be used in the treatment of slaughter wastewater. Under the condition of ensuring the treatment effect, the treatment process is shortened and the capital construction cost is saved.

When dealing with slaughter wastewater with higher concentration (CODcr>1000mg/L), the combined use of several processes can ensure that the wastewater treatment meets the standard.

For example, the investment in the hydrolysis and aerobic biological treatment process is only 70% of the activated sludge process of the same scale, the land occupation is reduced by 20%, and the treatment cost is reduced by 42%. The combined processes that have been used in China include: acidification-SBR process, acidification-AB method, acidification-biological contact oxidation process, UASB-AF process, anaerobic-filtration process, jet aeration-biological contact oxidation process, anaerobic pond-combination process Oxygen pond-aerobic pond process, facultative oxygen-AB method, chemical coagulation-biological treatment process, etc. The optimized combination of treatment processes is conducive to promoting the strengths and avoiding weaknesses of various processes and ensuring the quality of the effluent.

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