Two chemical methods for treating wastewater from slaughter equipment companies
Foodjx Guide : The chemical methods commonly used in slaughtering equipment enterprises to treat wastewater mainly include coagulation sedimentation, hydrolysis, etc. This method is generally used as a pretreatment of wastewater, and can also be used as a final treatment of wastewater.
1, coagulation treatment
Commonly used coagulants are aluminum salts, iron salts, etc., in which the polymerization of ferric sulfate is better in the treatment of slaughter wastewater. In order to reduce the amount of aluminum salt used, a mixture of polyaluminum chloride (PAC) and polyethylene ammonium may also be used as a coagulant. In the synthesis of polymeric ferric sulfate, any proportion of aluminum salt and a proportion of silicate are added. And a small amount of polyacrylamide to form a new coagulant CPFA-CS. The composite inorganic polymer coagulant has a wide pH value and temperature application range, and is used as a coagulant to treat slaughter wastewater, and the COD and chroma removal rates are up to 75% and 95%, respectively. A single coagulation process can reach or approach the integrated wastewater discharge standard. An obvious problem with pure coagulation treatment is that the blood water produced in the slaughtering process is difficult to remove. At the same time, a large amount of sludge and waste residue are produced. Therefore, if the slaughter wastewater is properly denatured before treatment with a coagulant. The ferrous sulfate and calcium oxide composite coagulant is used to treat the effluent COD concentration down to 197.4 mg/L. It has a good treatment effect, and the method is simple and has good environmental benefits. However, the wastewater treated by the method is limited to waste water having a COD concentration of less than l000 mg/L.
The cost of coagulation treatment wastewater treatment is low. It has a good treatment effect at low temperatures. This method is mostly used to treat low-concentration wastewater or as a high-concentration wastewater pretreatment to reduce the burden of subsequent biological treatment.
2. Alkaline hydrolysis and enzymatic hydrolysis
The method uses alkaline substances or enzymatic hydrolysis to reduce fat particles in the wastewater, often as a pretreatment for slaughter wastewater. Lime, NaOH, pancreatic lipase, bacterial enzymes, etc. are usually used, wherein lime is economical but produces a large amount of waste; when pretreatment with NaOH. Controlling the mass concentration of NaOH in the range of 150-300 mg/L, the average fat granules can be reduced to 73%±7% of the pre-treatment fat granules (D); the pretreatment effect with pancreatic lipase is good, pancreatic lipase PL A 250 can reduce the particle size of the fat particles to 60% ± 3% of the fat particles in the pre-treatment wastewater. Moreover, pancreatic lipase is more suitable for hydrolyzing beef fat; treated with bacterial enzymes. When the amount of bacterial enzyme used is large, a significant hydrolysis effect can be achieved. However, the alkaline hydrolysis treatment of slaughter wastewater will cause the pH of the wastewater to fluctuate and be difficult to control. The subsequent biooxidation processes and the like are not easy to operate normally.
1, coagulation treatment
Commonly used coagulants are aluminum salts, iron salts, etc., in which the polymerization of ferric sulfate is better in the treatment of slaughter wastewater. In order to reduce the amount of aluminum salt used, a mixture of polyaluminum chloride (PAC) and polyethylene ammonium may also be used as a coagulant. In the synthesis of polymeric ferric sulfate, any proportion of aluminum salt and a proportion of silicate are added. And a small amount of polyacrylamide to form a new coagulant CPFA-CS. The composite inorganic polymer coagulant has a wide pH value and temperature application range, and is used as a coagulant to treat slaughter wastewater, and the COD and chroma removal rates are up to 75% and 95%, respectively. A single coagulation process can reach or approach the integrated wastewater discharge standard. An obvious problem with pure coagulation treatment is that the blood water produced in the slaughtering process is difficult to remove. At the same time, a large amount of sludge and waste residue are produced. Therefore, if the slaughter wastewater is properly denatured before treatment with a coagulant. The ferrous sulfate and calcium oxide composite coagulant is used to treat the effluent COD concentration down to 197.4 mg/L. It has a good treatment effect, and the method is simple and has good environmental benefits. However, the wastewater treated by the method is limited to waste water having a COD concentration of less than l000 mg/L.
The cost of coagulation treatment wastewater treatment is low. It has a good treatment effect at low temperatures. This method is mostly used to treat low-concentration wastewater or as a high-concentration wastewater pretreatment to reduce the burden of subsequent biological treatment.
2. Alkaline hydrolysis and enzymatic hydrolysis
The method uses alkaline substances or enzymatic hydrolysis to reduce fat particles in the wastewater, often as a pretreatment for slaughter wastewater. Lime, NaOH, pancreatic lipase, bacterial enzymes, etc. are usually used, wherein lime is economical but produces a large amount of waste; when pretreatment with NaOH. Controlling the mass concentration of NaOH in the range of 150-300 mg/L, the average fat granules can be reduced to 73%±7% of the pre-treatment fat granules (D); the pretreatment effect with pancreatic lipase is good, pancreatic lipase PL A 250 can reduce the particle size of the fat particles to 60% ± 3% of the fat particles in the pre-treatment wastewater. Moreover, pancreatic lipase is more suitable for hydrolyzing beef fat; treated with bacterial enzymes. When the amount of bacterial enzyme used is large, a significant hydrolysis effect can be achieved. However, the alkaline hydrolysis treatment of slaughter wastewater will cause the pH of the wastewater to fluctuate and be difficult to control. The subsequent biooxidation processes and the like are not easy to operate normally.
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