Abstract:

The adsorption characteristics of residual sludge for mercury and arsenic in wastewater have been studied. Using simulated wastewater as the experimental subject, the effects of factors, such as pH, residual sludge dosage and adsorption time on the adsorption process are investigated. The results show that the best adsorption effect can be obtained when the conditions are as follows:pH is 7, the dosage of activated sludge 150 g/L, and adsorption time 12 hours. The adsorption process complies with Langmuir low. It is found that the initial concentrations of mercury and arsenic in solution are inversely proportional to adsorbing rate and proportional to adsorption capacity. The approach to the treatment of real environmental water samples can achieve very good results.

Key words: residual sludge, adsorption, mercury, arsenic

摘要：

对剩余污泥吸附废水中汞和砷的特性进行了研究。以模拟废水为实验对象, 探讨了pH、剩余污泥投加量、吸附时间等对吸附过程的影响。结果表明, 在模拟水样环境下, 当pH=7,剩余污泥投加量为150 g/L,吸附时间为12 h时, 可以获得最佳吸附效果;吸附过程遵循Langmuir定律。研究同时发现, 溶液中汞和砷的初始浓度与吸附率成反比, 与吸附容量成正比。利用此方法处理环境水样可达到很好的效果。

关键词: 剩余污泥, 吸附, 汞, 砷

CLC Number: 

• X703.1