高砷废水处理及含砷废渣稳定化的试验研究  被引量:9

Experimental Study on the Stabilization of Arsenic-containing Waste Residue and the Treatment of High-arsenic Wastewater

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作  者:贾海[1] 唐新村[1] 刘洁[1] 龚美丽[1] 黄富勤[1] 

机构地区:[1]中南大学化学化工学院,长沙410083

出  处:《安全与环境工程》2013年第3期53-57,共5页Safety and Environmental Engineering

基  金:中南大学与湖南展泰有色金属有限公司校企合作项目(107101102)

摘  要:本试验通过采用硫酸铁和聚合硫酸铁分两段对含砷量为6.4g/L的废水进行了处理。结果表明:当pH=5、Fe/As(质量比)=3∶1、反应时间为3h时,采用硫酸铁进行初步除砷后废水中砷含量降至0.5mg/L以内,达到了废水排放标准的砷含量要求;当pH=5、按照0.44g/100mL加入聚合硫酸铁、反应时间为2h时,采用聚合硫酸铁进行深度除砷后废水中砷含量降至0.05mg/L以内,达到了饮用水标准的砷含量要求。另外,对初步除砷所得的含砷废渣进行焙烧,当焙烧温度为700℃、焙烧时间为3h时,所得废渣经毒性浸出试验检测,完全满足TCLP毒性浸出试验的要求,可安全处置。本试验找到了一种适合大规模处理高砷废水和含砷废渣的方法,该方法工艺简单、可操作性强,具有很好的应用前景。This paper applies ferric sulfate(FS) and polymeric ferric sulfate(PFS) as the precipitating agents and takes two steps to treat the waste water with a high arsenic concentration of 6.4 g/L. The results show that: under the condition of pH=5,Fe/As(mass ration):3 : 1 and reaction time is 3 hours, the effect of preliminary arsenic removal by FS is the best and the arsenic concentration falls to 0.5 mg/L or less and reaches the arsenic content of the wastewater discharge requirements; under the condition of pH=5,the amount of PFS is 0.44 g/100 mL and reaction time is 2 hours,the effect of deep arsenic removal by PFS is the best and the arsenic concentration falls to less than 0.05 mg/L and reaches the arsenic content of the drinking water requirements. In addition,after the calcination of 700℃ and 3 hours, the arsenic-containing waste residue of preliminary removal meets TCLP leaching toxicity test and can be disposed safely. This experiment finds suitable methods for large-scale treatment of high arsenic wastewater and arseniccontaining waste residue, and the methods are simple and operable with good prospects of application.

关 键 词:高砷废水 含砷废渣 硫酸铁 聚合硫酸铁 毒性浸出试验 

分 类 号:X703.1[环境科学与工程—环境工程]

 

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