生物除铁除锰滤池对砷(Ⅲ)的去除效果

Arsenic(Ⅲ) removal by biofilter for iron and manganese removal

摘要:

采用人工配制的含有As(Ⅲ)30～200μg/L,Fe2+0.5～1.50mg/L,Mn2+0.6～2.0mg/L的原水,通过已经培养成熟的生物除铁除锰滤柱进行过滤实验,分别考察了3、4、5m/h滤速条件下砷的去除效果.结果表明:在原水中砷质量浓度低于200μg/L的情况下,生物除铁除锰滤池的铁锰去除能力基本不受砷的影响,并且砷的去除效果明显,去除率在95%以上.经过滤柱分层取水实验,发现砷的去除集中在0～660mm的滤层厚度.在反冲洗后,短时期内砷和铁有超标的现象.

Abstract:

In this research,the removal efficiency of As (Ⅲ) by biofilter was studied under filtration velocity of 3,4 and 5 m/h respectively,using well-established biofilter column and synthetic raw water which contains As (Ⅲ),Fe(Ⅱ) and Mn(Ⅱ) in the concentration of 30-200 μg/L,0. 5-1. 5 mg/L and 0. 6-2. 0 mg/L,respec-tively. The results indicate that the removal efficiency of biofilter on As (Ⅲ) can be over 95%,and it is not af-fected by As with the concentration below 200 μg/L in the raw water. The capability of arsenic removal of the biofilter is found to concentrate in the filter bed with deepness of 0-660 mm after measuring the samples from different sampling places. And As (Ⅲ)and Fe(Ⅱ) will exceed the standards for a short time after back-washing.