电场作用对不同藻菌体系处理猪场废水的强化机制研究

Study on the effect of enhanced microalgae-activated sludge system based on electric field pretreatment treating pig-raising biogas slurry

为解决猪场废水高色、高浊、高盐的水质特征对藻菌微生物体系处理效果的限制作用,采用电场处理与多种不同微藻/细菌(活性污泥)微生物体系处理相结合,考察了电场对微生物处理猪场废水的效果和生长状况的影响和作用机制.同时,通过对比微藻、微藻-活性污泥、活性污泥3种微生物体系对经电场处理养猪沼液中污染物去除效果及微生物生长情况,考察了电场处理对微生物处理效果的影响和作用.结果表明:电场对养猪沼液色度和浊度均有较好的去除效果,去除率分别为90.43%、99.69%;电场处理后的沼液再进行微生物处理可取得更优的处理效果,微生物对总氮和总磷的去除率最高分别为70.65%、67.30%.此外,微藻-活性污泥共生体系在污染物去除效果和生长状况方面均优于单一微生物体系.微藻-活性污泥体系最终叶绿素a含量为接种时的7.65倍,活性污泥生物量为接种时的1.51倍,远高于单一微生物体系.说明电场处理与微藻-活性污泥生物处理相结合,可以有效提高污染物去除效果,同时获得更多有价的生物质资源,实现更为可观的经济价值,具有广阔的应用潜力和发展前景.

To eliminate the negative influence caused by the characteristics of piggery wastewater including high-color,high-turbidity,and highsalinity on microalgae-bacteria symbiosis process,electric field treatment combined with municipal types of microbial treatment including microalgae,activated sludge and their symbiosis were investigated in this study,focusing on the effecting law and action mechanism of electric field on the treatment efficiency and growth conditions.The results showed that electric field treatment could achieve reasonable removal rates on both colourity and turbidity at 90.43%,99.69%,respectively.Besides,electric field could also enhance the treatment efficiencies by microbial treatment followed,with removal rates up to 70.65%,67.30% for total nitrogen and total phosphorus,respectively.Moreover,microalgae-bacteria symbiosis achieved much higher pollutants removal rates than bacteria only and microalgae only microbial treatment systems.Chlorophyll a content in symbiosis group finally achieved 7.65 times increase compared to the initial value,and the biomass of bacteria increased to 1.51 times of that,which were all much higher than other single microorganism system.It is proved that the combination of electric field treatment and microalgae-bacteria symbiosis process could efficiently improve the wastewater treatment efficiency,as well as harvesting more valuable biomass resources,to achieve a more considerable economic value,greater development potential and wider application future.