球状纳米CaO_(2)的制备及其协同电渗透污泥深度脱水

Preparation of spherical nano-CaO_(2) and its application in sludge deep-dewatering coupled with electro-osmotic

为了研究纳米CaO_(2)协同电渗透污泥深度脱水的可行性,首先采用钙盐法制备纳米CaO_(2)并优化了其制备条件,将制备的纳米CaO_(2)协同电渗透技术对城市污泥进行了深度脱水研究。结果表明,分散剂用量、搅拌速率、H_(2)O_(2)滴加速率及用量均会对CaO_(2)的纯度、产率和形貌造成影响,在分散剂用量为100mL、搅拌速率为500r/min、H_(2)O_(2)用量为22.5mL、H_(2)O_(2)滴加速率为0.75mL/min时,制备得到CaO_(2)的纯度和产率分别可以达到79.13%和74.62%,自制CaO_(2)呈现球状或椭球状,粒度在45~300nm之间;当CaO_(2)投加量为100mg/g DS、电压为50V、初始污泥量为705g时,自制纳米CaO_(2)协同电渗透可以将污泥含水率降至67.52%,相较于同样条件下使用市售CaO_(2),污泥含水率降低了10.91%。

In order to investigate the feasibility of sewage sludge deep-dewatering by coordination of nano-CaO_(2) and electro-osmotic,the nano-CaO_(2) was fabricated by calcium salt method under optimized parameters firstly,and then the prepared nano-CaO_(2) coupled with electro-osmotic were used to investigate the deep-dewatering of sewage sludge.The results showed that the purity,yield and morphology of CaO_(2) would be affected by dispersant dosage,stirring speed,the dosage and drip rate of H_(2)O_(2).The purity and yield of CaO_(2) could reach 79.13% and 74.62% with dispersant dosage of 100mL,stirring speed of 500r/min,drip rate of 0.75mL/min and H_(2)O_(2) dosage of 22.5mL respectively.Homemade nano-CaO_(2) was spherical or ellipsoidal,with a particle size within 45-300nm.The water content of dewatered sludge could be reduced to 67.52% with self-made nano-CaO_(2) dosage of 100mg/g DS,voltage of 50V,initial sludge dosage of 705g.Compared to commercially available CaO_(2) under the same conditions,the water content of dewatered sludge was reduced by 10.91%.