贝壳用于污泥消化上清液除磷的试验研究

Application of Shells to Phosphorus Removal from Sludge Digestion Supernatant

贝壳作为海产品废弃物已成为沿海地区亟待解决的废物处理问题。目前对贝壳资源化利用途径的研究也日渐广泛，例如可以作为废水处理的填料等。研究了将贝壳制作成贝壳粉用作废水除磷材料的可行性，试验分两部分：第一部分是模拟含磷废水试验，废水由K2HPO4·3H2O、啤酒和自来水配制；第二部分是实际废水试验，利用剩余污泥消化上清液作为试验用水。贝壳粉溶液由贝壳粉和盐酸配制而成。试验条件设定如下：pH值为7～12，沉淀时间为0．5～5h，贝壳粉溶液投加量为0—3．0mL。试验结果表明，在pH值〉11、沉淀时间为2～5h下，当模拟废水中贝壳粉溶液投加量为1．0mL、污泥消化上清液中贝壳粉溶液投加量为1．5mL时，总磷浓度均小于0．5mg／L，达到《城镇污水处理厂污染物排放标准》（GB18918-2002）的一级A标准。

As wastes from marine products, shells have been a major disposal problem in coastal regions in China. The resource utilization of shells, for example as carrier for wastewater treatment, has been studied widely. The feasibility of using shell powder for wastewater phosphorus removal was investigated. The experiments were divided into two parts. One was an experiment using synthetic wastewater prepared by K2HPO4 · 3H2O, beer and tap water, and the other was an experiment using actual wastewater namely sludge digestion supernatant. Shell powder solution was prepared by hydrochloric acid and shell powder. The experiment conditions were set as follows ： pH 7 to12, sedimentation time 0.5 to 5 h and shell powder solution dosage 0 to 3.0 mL. The results showed that when pH was greater than 11, sedimentation time was 2 to 5 h, and the shell powder solution dosage was 1.0 mL in the synthetic wastewater and 1.5 mL in the actual wastewater, the TP concentration was less than 0.5 mg/L, which met the first class A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （ GB 18918 -2002）.