小球藻去除RO浓水与废水混合液中TDS的研究

Removal of TDS from Mixture of RO Concentrate and Wastewater by Chlorella

选取城市污水厂一级处理出水、二级处理出水、消化反应上清液分别与RO浓水混合，配制3组RO浓水占30％的混合液，分析小球藻在3种培养液中的生长情况及其对混合液中Ca^2＋、Mg^2＋、Na^＋、K^＋、PO4^3-、SO4^2-、Cl^-的去除效果。结果表明：在3种混合液中小球藻均能正常生长，生物量分别增加了330％、310％和290％；阳离子浓度下降9．0％～96．5％，3种混合液中的Ca^2＋、Mg^2＋去除率与混合液的碱度成正比，两种离子在消化液混合液中的去除率分别高达96．5％和44．2％，Na^＋、K^＋去除率介于9．0％～26．2％之间；3种混合液中PO4^3-的去除率高达75．9％～99．7％，SO4^2-去除率介于1．5％～19．4％，Cl^-浓度下降12．6％～25．5％；小球藻的生物量与Na^＋、K^＋及Cl^-的去除率成正比。

The primary effluent, secondary effluent and digester supernatant were mixed with RO concentrate respectively to prepare three kinds of mixtures with RO concentrate concentration of 30%. The growth of Chlorella in the mixtures and the removal efficiency of Ca^2＋ , Mg^2＋ , Na^＋ , K^＋, PO4^3-- , SO4^2- and Cl^- by Chlorella were investigated. The results showed that the biomasses of Chlorella in the three kinds of mixtures were increased by 330%, 310% and 290%, respectively. The concentrations of the four kinds of cations were reduced by 9.0% to 96.5%, the removal rates of Ca^2＋ and Mg^2＋ were proportional to the alkalinity in the three kinds of mixtures and were up to 96.5% and 44.2% respectively in digester mixture, and the removal rates of Na^＋ and K^＋ were between 9.0% and 26.2%. The removal rates of PO3^4- , SO4^2- and Cl^- in the three kinds of mixtures were 75.9% to 99.7% , 1.5% to 19.4% and 12.6% to 22.5%, respectively. The biomasses of Chlorella were proportional to the removal rates of Na^＋ , K^ ＋ and Cl^-.