Process for treatment of high density aquaculture sewage

Abstract

The invention relates to a process for treatment of high density aquaculture sewage. The process is characterized by: pumping high density aquaculture sewage into a microbial flocculation reactor, and adding a Bacillus subtilis seed bacterial solution subjected to activation culture, with the seed bacterial solution and the culture sewage being in a volume ratio of 1-3:100; disposing aeration equipment evenly at the bottom inside the reactor, and controlling the gas-water ratio at 2-2.5:1 and the dissolved oxygen at a concentration of 2-3mg / L; fully mixing the pumped sewage with the seed bacterial solution added therein for 0.8-1.2h under a blast aeration effect to produce biological flocculants decompose organic matters and proliferate microorganisms; leaving the mixed solution generated in the microbial flocculation reactor to flow through a sedimentation-biotreatment reactor, which relies on natural ventilation for oxygen supply and is filled with a suspending biological filter material at a filling rate of 25-30%; performing solid-liquid separation and biochemical reaction on the mixed solution in the sedimentation-biotreatment reactor; and subjecting the generated sediment, except for part of returned sludge, to centralized discharge, returning the sludge to the microbial flocculation reactor, and returning pure water to a culture pool.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a process method for treating high-density aquaculture sewage. Background technique [0002] my country is a large aquaculture country with limited resources and energy shortage. With the continuous expansion of intensive farming scale, metabolites produced by feeding, residual bait organic matter and ammonia nitrogen and other inorganic substances have become new sources of pollution. At the same time, the increasingly aging and polluted water environment has also restricted the further development of the aquaculture industry. The recirculating aquaculture model makes full use of advanced technologies and means to create a good living environment for fish, realize high-yield, high-efficiency production and zero discharge of aquaculture sewage, and greatly improve the utilization of land resources. It has become an inevitable trend for the sustainable develop...

AI Technical Summary

Problems solved by technology

At present, the mainstream water purification methods of this model use a large amount of nitrogen and phosphorus substances in the water as pollutants, and use physical and biological water treatment technologies and methods to effectively remove them, resulting in high investment and operating costs, especially for high-density water. In terms of aquaculture production, it greatly restricts the further application and promotion of the recirculating aquaculture model

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