污泥制取脱氮除磷材料的配比试验研究

以微波处理后城市污水厂污泥、天然沸石和水泥为原材料,不进行任何改性,探讨原材料的最佳配比,研制一种既具有脱氮除磷功能,又具备抗压强度,并可在水体中保持一定形态的低能耗环保合成材料.结果表明,水泥∶天然沸石∶污泥的质量比为1∶2∶0.05,水灰比为0.4,发泡剂∶水的体积比为1∶60时,合成材料的耐水性能良好,7d的抗压强度为5.8 MPa,满足用于净化水景、河道底部及驳岸生态混凝土的强度要求,对氮、磷去除效果良好,平衡吸附量分别为50、83.5 mg/kg,符合准二级动力学模型.

Research on the component ratio of ammonium nitrogen and phosphorus removal material made from sewage sludge

This article researched a low energy consumption environment-friendly synthetic material in the form of combined microwave-treated sludge,zeolite and portland cement,which was capable of effectively removing nitrogen and phosphorus without any modification.This material maintained its original shape in water due to its high mechanical strength.The best ratio of synthetic material was investigated.The result showed that when a mass ratio for portland cement,zeolite and microwave-treated sludge is 1∶ 2∶ 0.05,the water-cement ratio is 0.4 and foaming agent water-ratio is 1∶ 60,the material achieved a compressive strength which can fulfill the strength requirement of related demonstration project.Synthetic material manifested the effective ammonium nitrogen and phosphorus removal capacities.It is able to absorb 50 mg/kg of ammonium nitrogen and 83.5 mg/kg of phosphorus respectively.The pseudo-second-order kinetics model is found to fit well the nitrogen and phosphorus adsorption process.