Treatment method of anaerobic digested liquid for livestock and poultry breeding pollutants

Abstract

The invention provides a treatment method of anaerobic digested liquid for livestock and poultry breeding pollutants, belonging to the wastewater treatment technology. The treatment method comprises the following steps: after preparing methane by anaerobic digestion of the livestock and poultry breeding pollutants, the residual anaerobic digested liquid enters a low-speed centrifuge for separation after being settled by a pre-sedimentation tank, and the obtained supernatant after centrifugation enters a chemically enhanced primary treatment tank; a flocculant is added to strengthen removal ofphosphorus from the anaerobic digested liquid, the anaerobic digested liquid enters an anoxic-aerobic membrane bioreactor through the primary treatment tank to complete efficient and simultaneous biological removal of an organic matter and nitrogen and phosphorus in an anoxic-aerobic area; after the anaerobic digested liquid is separated by a membrane component in an aerobic area, clear water returns to an anaerobic digestion system of the livestock and poultry breeding pollutants to realize zero emission during the treatment process of the livestock and poultry breeding pollutants; and sludge mixed liquid in the aerobic area returns to an anoxic reactor via a reflux pump for denitrification. The treatment method of the invention provides an idea of sewage zero discharge, water conservation and consumption reduction for the whole anaerobic digestion course of the livestock and poultry breeding pollutants.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a treatment method for anaerobic digestion liquid of livestock and poultry breeding sewage. Background technique [0002] With the development of the national economy and the improvement of people's living standards, my country's breeding industry has developed rapidly, and has developed from small family farming to intensive large and medium-sized and large-scale farms. These large-scale farms have provided people's lives. It is rich in meat, poultry, eggs, and milk, but the dirt produced in the breeding process has also brought serious environmental pollution problems. In this severe situation, the anaerobic digestion process has attracted the attention of the world because of its characteristics of using livestock and poultry manure to generate energy. The so-called anaerobic digestion is to make anaerobic microorganisms multiply and use their life activities to convert organic...

AI Technical Summary

Problems solved by technology

However, there is an important technical bottleneck in the application process of wet anaerobic digestion technology - the safe disposal of anaerobic digestion liquid, which deviates from the current development strategies such as energy saving, emission reduction, water saving and consumption reduction, especially anaerobic digestion liquid The high concentration of pollutants contained in it will cause serious environmental pollution if discharged directly.

The safe disposal of anaerobic digestion liquid has been related to whether the application of wet anaerobic digestion meets the requirements of environmental protection. At present, the consumption and utilization of anaerobic digestion liquid has become an important factor restricting the construction of biogas projects