High-efficiency nitrogen and carbon removal treatment process for aquaculture wastewater with low c/n ratio anaerobic biogas slurry

Abstract

An efficient denitrifying and carbon-removing device for culture wastewater anaerobic biogas slurry with a low C / N ratio and a process thereof are disclosed. The main part of the device comprises four-stage micro-aerobic aeration tanks. Based on a step-by-step water feeding technique, a micro-aerobic aeration technique and a coagulating sedimentation technique, the process which is capable of synchronously coupling denitrification and carbon removing through step-by-step water feeding and micro-aerobic aeration, self-balanced in carbon source, self-balanced in alkalinity, high in efficiency, low in consumption and capable of reaching standards is constructed. The process includes subjecting livestock culture wastewater to solid liquid separation, feeding the wastewater as a resource into a UASB reactor, producing biogas and the biogas slurry through anaerobic fermentation, feeding the biogas slurry with the low C / N ratio and high nitrogen and phosphorus concentrations into a step-by-step water feeding micro-aerobic aeration system (SFAO4), subjecting the biogas slurry to efficient denitrification and carbon removing, continuously feeding biochemical treatment effluent into a coagulating clarifier, performing deep denitrification and phosphorus removing, and discharging after clear water reaches the standards. The device and the method are advantaged by good denitrification and phosphorus removing effects, high resistance to impact load and a low running cost.

Description

technical field [0001] The invention belongs to the field of environmental protection wastewater treatment, and in particular relates to a high-efficiency denitrification and carbon removal treatment device for aquaculture wastewater with low C / N ratio anaerobic biogas slurry and a process thereof. Background technique [0002] With the development of social economy and the continuous improvement of people's material living standards, the livestock and poultry breeding industry has become one of the pillar industries of my country's agricultural development. But at the same time, the environmental problems it brings are becoming increasingly prominent. According to the Bulletin of the First National Survey of Pollution Sources released in 2010, the emissions of COD and ammonia nitrogen from agricultural sources were 13,240,900 tons and 918,100 tons respectively, of which the emissions of COD and ammonia nitrogen from the livestock and poultry industry were 12,682,600 tons re...

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However, this will inevitably lead to huge energy loss, accounting for 40%-50% of the total energy consumption of the entire process

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