Treatment efficiency of immobilized algal-bacterial symbiotic system on rural gray water
Gray water is a kind of domestic sewage with light extent of pollution,and rural grey water accounts for 60％～70％of rural domestic sewage.If it is properly used,the situation of rural water shortage will be greatly improved.algal-bacterial symbiosis system is a potentially efficient and economical treatment for rural gray water.In this study,the feasibility of practical application of this method was demonstrated by studying the biological activity and pollutant removal effect of single or symbiotic Chlorella-activated sludge system under free and immobilized states,and the variation rule of microbial growth under different conditions was analyzed.The experimental results show that,in the condition of no aeration,the photosynthesis of Chlorella can supply a certain amount of Dissolved Oxygen(DO)to the system,and the immobilized Chlorella-activated sludge system showed the best removal effect on the pollutants in simulated rural gray water(the removal rate of chemical oxygen demand 87.5％±2.89％;Ammonia nitrogen 65.34％±2.0％;Total Phosphorus(TP)60.4％±4.29％;Linear Alklybezene Sulfonates(LAS)91.07％±2.04％).The treatment effect was better than that of single fixed system and free system of bacteria or algae,and the biomass increased significantly compared with other experimental groups(p＜0.05).The symbiotic effect between activated sludge and Chlorella was obvious.In the semi-continuous operation test,the immobilized algal-bacterial symbiosis system showed better pollutant removal stability.The unit cell chlorophyll content and Mixed Liquor Suspended Solids(MLSS)accumulation in the immobilized state were 1.6 and 1.5 times of that in the suspended state,respectively,and the biological growth was good in the immobilized state.In the immobilized state,the phylum flora retained more of the same category before and after the experiment,while the changing trend of Actinobacteria in the two experimental groups was different.During the experiment,LAS showed obvious enrichment of bacteria and strong inhibition of nitrobacteria activity,indicating that nitrogen removal in water was closely related to the biological activities of Chlorella.
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