A treatment device and process for deep denitrification and phosphorus removal of livestock and poultry breeding wastewater

Abstract

The invention discloses a livestock / poultry culture wastewater deep denitrification and dephosphorization standard treatment device and process. On the basis of the anaerobic fermentation technique, microaerobic aeration technique and nitrogen phosphorus recovery technique, the synchronous microaerobic aeration / denitrification-decarbonization coupled coagulation crystallization dephosphorization standard treatment process with reinforced denitrification and dephosphorization is formed to lower the operating cost. The process specifically comprises the following steps: livestock / poultry culture wastewater is firstly subjected to solid-liquid separation treatment, the waste slag is used for producing organic fertilizers, and the wastewater is used as a resource to enter a UASB (upflow anaerobic sludge blanket) reactor and is subjected to anaerobic fermentation to produce biogas; high-concentration nitrogen phosphorus anaerobic effluent water enters a microaerobic aeration biochemical reactor to perform synchronous denitrification-decarbonization; and biochemical effluent water continuously enters a coagulation crystallization dephosphorization clarifier to perform nitrogen phosphorus recovery, the crystalline solid containing nitrogen and phosphorus nutrients is used as a raw material for producing organic fertilizers, and the standard clear water is discharged. The device has the advantages of favorable denitrification-decarbonization effect, high nitrogen / phosphorus resource recovery ratio, high impact load resistance and low operating cost, and is easy for popularization and application.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, and in particular relates to a treatment device for deep denitrification and dephosphorization of livestock and poultry breeding wastewater up to standard and a process thereof. Background technique [0002] During the "Eleventh Five-Year Plan" period, the state carried out comprehensive treatment of rivers seriously polluted by agricultural non-point sources, especially in the control of water pollution from large-scale pig farming waste. Wastewater COD Cr The concentration can basically achieve discharge standards. However, the concentration of nitrogen and phosphorus seriously exceeds the standard, which makes the nitrogen and phosphorus load of the water body received by the regional farms too large, resulting in eutrophication of the water body. During the "Twelfth Five-Year Plan" period, the state will focus on controlling the nitrogen and phosphorus pollution o...

AI Technical Summary

Problems solved by technology

Existing actual projects show that the anaerobic fermentation-aerobic-oxidation pond / constructed wetland combined treatment process has a good removal effect on COD and SS, but has no significant effect on nitrogen and phosphorus removal, and the resource recovery rate is low, making it difficult to Realize the recycling and utilization of pig farm waste resources and the stable and up-to-standard discharge of breeding wastewater

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