摘要
Abstract
[Objective]With the rapid development of China's market economy and the acceleration of urbanization,the aquaculture industry is gradually transitioning towards scale and intensification.The total amount water discharged from aquaculture is large,and insufficient carbon sources inhibit denitrification,resulting in low nitrogen removal efficiency and substandard total nitrogen removal,forming a technical bottleneck that restricts the sustainable development of the aquaculture industry.Constructed wetlands is an effective solution to this problem,and optimizing the selection of fillers is one of the core technological paths to improve the efficiency of pollutant interception and conversion,which directly affects the treatment effect of sewage.Among them,iron carbon composite materials,due to their inherent potential difference,can form a continuous primary battery effect based on iron carbon micro-electrolysis in discharged water,thereby achieving better removal efficiency.[Methods]This paper first conducted experiments on the effect of different thicknesses of iron carbon materials and wetland submergence depth on pollutant removal,achieved a reasonable iron carbon micro-electrolysis constructed wetland structure,and then tried on different inflow method,namely different pulse frequencies and inflow durations,to investigate the pollutant removal effect of constructed wetlands under different working conditions.Further the mechanism of pollutant removal through physical characterization and microbial community analysis was explored.[Results]Taking into account the removal efficiency and wetland construction cost,the optimal wetland structure in this study was a 44 cm(40％of the total thickness)iron carbon thickness and a submerged depth of 54 cm.Under different operating conditions,the optimal removal effect was achieved when the pulse inlet frequency was 24 times/d and the inlet time was 15 minutes.The removal rates of COD,total nitrogen,and ammonia nitrogen were 79.3％,62.5％,and 70.2％,respectively.The removal rate of pulse inlet was significantly higher than that of continuous inlet.[Conclusion]This paper constructes an iron carbon microelectrolysis constructed wetland,effectively solving the problems of insufficient carbon sources and high nitrogen load in aquaculture wastewater treatment.This provides data support for the optimization of constructed wetlands in the future and offers an economically efficient technical solution for low-carbon denitrification of aquaculture wastewater.关键词
铁碳微电解/湿地材料/水产养殖废水/微生物/微电解强化人工湿地Key words
iron-carbon micro-electrolysis/wetland material/aquaculture wastewater/microorganism/micro-electrolysis enhanced constructed wetland分类
资源环境
