复合制剂对富营养化水体中氮磷的去除效果

Removal of Nitrogen and Phosphorus from Eutrophic Waters by Complex Preparation

利用等温吸附模型评价了沸石粉的吸氨性能,结果表明该沸石粉易于吸附NH3-N.在此基础上,研究获得了一种有效去除富营养化水体中氮磷污染物的复合制剂.该复合制剂成分为沸石粉和聚合氯化铝,其最佳质量配比为95∶5.在ρ(NH3-N)和ρ(TP)分别为10和1 mg/L的模拟水样中,复合制剂投加量越大对NH3-N和TP的去除率越大,但去除率增大趋于缓慢;当接触时间为4 d时,复合制剂趋于达到吸附平衡,NH3-N和TP的去除率基本达到最大.复合制剂除磷效果受pH影响明显,在pH为7时,其对氮磷的去除效果最佳;随着温度的升高,复合制剂对NH3-N和TP的去除效果略有提高.将复合制剂用于实际污染河水中,其对NH3-N,TP和浊度的去除效果明显,同时也能去除少量的CODCr.在对富营养化水体的修复中,投加复合制剂可以作为修复工程的辅助技术进行应用.

The effective adsorption of ammonia-nitrogen（NH3-N） by zeolite powder was evaluated by isothermal adsorption models.Then,a kind of complex preparation which could effectively remove nitrogen and phosphorus from eutrophic waters was obtained.The complex preparation was composed of zeolite powder and polyaluminum chloride（PAC）,and the optimal mass ratio of zeolite powder to PAC was 95∶5.The concentrations of NH3-N and total phosphorus（TP） were up to 10 mg L and 1 mg L respectively in the simulated waters.The removal efficiencies of NH3-N and TP increased with the dosage of the complex preparation,and the trend slowed down as the dosage increased.The adsorption equilibrium was reached within 4 days,when NH3-N and TP could hardly be removed any more.Compared with NH3-N,the removal of TP was significantly affected by pH,and the optimal pH for the complex preparation was 7.With the increase of the temperature,the removal of NH3-N and TP had little enhancement.Addition of the complex preparation to a polluted river led to effective removal of NH3-N,TP and turbidity,as well as removal of CODCr to a certain extent.Therefore,the complex preparation can serve well as an assistive technique in restoration of eutrophic waters.