Live pig slaughtering wastewater treating method

Abstract

The invention discloses a live pig slaughtering wastewater treating method which comprises the steps of (1) removing thick and large materials and pig hairs in wastewater as slaughtering wastewater firstly passes through a mechanical grating screen; (2) removing animal oil and pollutants with specific gravity more than that of water in the wastewater by enabling wastewater to flow into an oil separating sedimentation tank; (3) hydrolyzing macromolecules and organic matters which are difficult to degrade; (4) carrying out EGSB (expanded granular sludge bed) degradation on most part of organic matters in the wastewater; (5) carrying out degassing sedimentation on sludge contained in water from the step (4) in a middle sedimentation tank; (6) improving SBR (styrene butadiene rubber) degradation or converting parts of the organic matters and a large part of ammonia nitrogen; (7) disinfecting; and (8) reducing ammonia nitrogen concentration in water in a stabilization pond. The method aims at slaughtering wastewater characteristics that the water quality and the water amount are large in changing amount, and the COD (chemical oxygen demand), the ammonia nitrogen and the SS (suspended matters) are high, simultaneously considers the problems of deep denitrification and deep organic matter removal, is good in treatment effect, enables the discharged water quality to meet one level of effluent standards after the slaughtering wastewater is treated, and is lower in operating cost and convenient to popularize and apply.

Description

technical field [0001] The invention relates to a method for treating pig slaughter wastewater, which belongs to the technical field of environmental protection wastewater treatment. Background technique [0002] The wastewater produced by the pig slaughtering and processing industry contains a lot of pollutants such as blood, grease, fur, meat scraps, bone scraps, visceral debris, undigested food, and feces. Protein, oil and high salt content, high concentration of wastewater, serious pollution. Slaughter wastewater treatment commonly used biochemical methods, including anaerobic, aerobic and facultative treatment systems. At present, most small-scale slaughterhouses only discharge directly after simple treatment in septic tanks, which brings serious pollution to the receiving water body. Therefore, choosing a slaughter wastewater treatment process with low construction and operating costs, stable operation, and easy management is beneficial to the operators. and protecti...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for treating pig slaughter wastewater. In view of the characteristics of large changes in the quality and quantity of slaughter wastewater, high COD, ammonia nitrogen, and SS, and considering the problems of deep denitrification and deep removal of organic matter, the method of the present invention proposes The hydrolytic acidification-EGSB-improved SBR-stabilization pond process has been adopted, and the treatment effect is good. After the slaughter wastewater is treated, the effluent water quality meets the discharge requirements, and the operating cost is low, which is convenient for popularization and application.

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