Engineering application of immobilized microorganism technology and process in treatment of marine aquaculture tail water
China's mariculture scale ranks first in the world,and the rapid development of aquaculture industry has also brought environmental pollution issues that cannot be ignored,resulting in excessive nitrogen and phosphorus discharges into offshore waters,declining water quality,and posing threats to the ecological environment.The discharge of marine aquaculture tail water is substantial and contains complex pollutants,making it difficult to treat.Aiming at the characteristics of high salinity and low carbon to oxygen ratio in the tail water of mariculture,an enhanced nitrogen removal process of"aerobic/anaerobic/anaerobic/aerobic"based on immobilized microorganism technology was developed in this paper.Through the implementation of a"filtration-biochemical-flocculation and flocculation precipitation"process,the tail water was treated in three stages to achieve deep removal of nitrogen,phosphorus,and other pollutants.The actual operation results show that the process starts quickly and consumes low energy.The maximum removal rates of inorganic nitrogen and active phosphate are 97.67%and 98.35%,respectively,reducing their mass concentrations of inorganic nitrogen and active phosphate in effluent to0.27 and0.033 mg/L,respectively.The water quality index meets the first-class standard of"Marine aquaculture Water discharge Requirements"(SCT/T9103-2007).The technology realizes the deep nitrogen and phosphorus removal by microbial method in high brine and can be used as a recommended process for tail water treatment in aquaculture industry.
国家科技期刊平台
NSTL
万方数据
