Method for purifying aquaculture wastewater for prawns

Abstract

The invention relates to a method for purifying the aquaculture wastewater for prawns, and is intended to effectively filter out soluble harmful components, suspended substances and other harmful substances in the aquaculture water. The method sequentially comprises three-stage purification of the aquaculture wastewater: biological purification, filtration purification and absorption purification. In the biological purification, the algae is used for absorbing ammonium and other soluble harmful components in the wastewater discharged from the aquaculture pond as well as organic granules in the filter-feeding wastewater for filter-feeding shellfish and fish; in the filtration purification, the method allows the wastewater to pass through a sand-filtering field, so that the suspended granules and plankton in the wastewater can be filtered out; and in the absorption purification, parts of the soluble substances in the wastewater are absorbed by the surfaces of corallites and activated carbon, while parts of the soluble substances are absorbed and transformed by the beneficial bacteria growing on the surfaces of the corallites and the activated carbon. By adopting the circulation of aquaculture water, the invention can reduce the wastewater discharge and reduce the probability of outbreak and prevalence of prawn-related diseases on one hand, and by putting algae, shellfish and filter-feeding fish in the circulation, the invention can increase the income and the economic benefit of aquaculture on the other hand.

Description

technical field [0001] The invention relates to the field of artificial breeding of aquatic animals, in particular to a method for filtering prawn breeding sewage. Background technique [0002] The water pollution of aquatic animal breeding is an increasingly serious problem, especially the artificial breeding of prawns. Due to the high breeding density, large amount of bait, and large amount of metabolic waste in the artificial breeding of prawns, the phenomenon of eutrophication in the breeding water is becoming more and more serious. Most shrimp farms (including earthen pond culture and high-level pond culture) discharge the wastewater and waste directly during the breeding process and after the culture without any treatment, causing certain pollution to the farm and the surrounding environment and even the general environment. The ecological environment has been destroyed, and the possibility of outbreaks of prawn diseases has been increased. [0003] At present, the fo...

AI Technical Summary

Problems solved by technology

For example: method 1) can reduce the soluble harmful components (ammonia nitrogen, nitroso salt, etc.) At the same time, fish and shellfish themselves must discharge certain metabolic waste; method 3) and method 4) can remove most of the suspended matter, but cannot reduce the soluble harmful components

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