The slaughter wastewater mainly contains high concentrations of nitrogen-containing organic compounds, suspended solids, dissolved solids, oils and proteins, including blood, oil, minced meat, undigested food residues, hair, manure and sediment, and high suspended solids. With unpleasant blood red and irritating bloody smells; it may also contain a variety of bacteria related to human health. The amount is large and polluting, so the domestic management has also given extensive attention. Some advanced treatment processes have been applied in the slaughterhouse and achieved good environmental benefits. For such readily degradable organic wastewater, biological treatment processes are one of the most economical and effective treatment methods. Therefore, biochemical methods or biochemical-based physicochemical biochemical combination processes are used at home and abroad to treat slaughter wastewater. At present, the commonly used methods at home and abroad are:
1 chemical method
(1) Alkaline hydrolysis and enzymatic hydrolysis
The process uses alkaline substances or enzymatic hydrolysis to reduce fat particles in the wastewater, which is often used as a pretreatment for slaughter wastewater. Usually, lime, NaOH, lipase, bacterial enzyme, etc. are used, wherein lime is economical but it will produce a large amount of waste residue; when pretreatment with NaOH, the mass concentration of NaOH is controlled in the range of 150-300 mg/L, and the average fat granule can be obtained. Reduced to 73% ± 7% of the fat particles (Din) before treatment; pretreatment with pancreatic lipase is the best, pancreatic lipase PL-250 can reduce the size of fat particles to 60% of the fat particles in the wastewater before treatment. %±3%, and pancreatic lipase is more suitable for hydrolyzing bovine S-salt; it can be treated with bacterial enzymes, and the bacterial enzyme can be used in a large amount to achieve obvious hydrolysis effect. However, the alkaline hydrolysis treatment of slaughter wastewater will cause the pH value of the wastewater to fluctuate, which is difficult to control, and the subsequent biooxidation processes are not easy to operate normally.
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