Raw water after-treatment method in aquatic breeding plant in summer and autumn

Abstract

The invention provides a raw water after-treatment method in an aquatic breeding plant in summer and autumn, aiming at the conditions of high bacteria density, high sulfide content and high ammonia nitrogen content in raw water in the aquatic breeding plant in summer and autumn. With the adoption of ferrate pretreatment and hydrogen persulfate matched treatment, the amount of the hydrogen persulfate is reduced, and the sterilization effect of the ferrate is enhanced. According to the water treated by the method disclosed by the invention, the number of pathogenic bacteria in the water condition is 103 bacteria per ml or below, the sulfide content is in a safe concentration range, and when the water is used for breeding, the seed quality and the survival rate of the aquatic breeding plant can be obviously improved, the dependence on antibiotics in the breeding and cultivating link is alleviated or avoided, and the edible security of cultured products is effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of aquatic seedling cultivation, and in particular relates to a post-treatment method for raw water of aquatic seedling cultivation plants in summer and autumn. Background technique [0002] In recent years, with the rapid development of the nursery industry, for example, the number of sea cucumber nurseries in Wafangdian, Dalian has soared from 200 10 years ago to more than 7,000 at present, and the self-pollution phenomenon it brings is also becoming more and more serious , the quality of offshore seawater is deteriorating at an accelerated rate. [0003] The traditional raw water treatment methods for seedling cultivation are mainly dark sedimentation, pressure sand filtration (or valveless filter), and the elimination of bacteria is completed in the seedling cultivation workshop, mainly using various antibiotics. The consequence that causes is that the seedling survival rate is not high during the indoor cultiva...

AI Technical Summary

Problems solved by technology

However, the key restrictive factors for using ferrate as a high-efficiency agent for water treatment are the harsh preparation process conditions and high production costs of high-purity solid ferrate, which greatly restricts its wide application in industrial fields, while the production of liquid ferrate Although the cost is low, the stability of ferrate in aqueous solution is poor and the storage period is short. These problems have become the main bottleneck restricting the popularization and application of ferrate [Preparation of ferrate and its application in water treatment, 2006 April, Volume 2, Issue 4, Hebei Chemical Industry]

Hydrogen persulfate has a good inhibitory and killing effect on pathogenic bacteria in water, but the dosage is relatively large when used alone [Wang Bing, Ai Hongxue, Li Bo et al. (2008). Potassium monopersulfate is pathogenic to common aquaculture animals Inhibition and killing effect of bacteria. Chinese Journal of Disinfection, 25(5):501-502], resulting in higher processing costs