无机组合—微生物絮凝剂联用对矿坑涌水中低浓度铅的去除

发布时间：2018-05-07 15:44

本文选题：吸附絮凝 + 无机絮凝剂　；参考：《昆明理工大学》2015年硕士论文

【摘要】：目前,环境受重金属污染越来越严重,铅对水环境的污染尤为突出。铅及一些可溶性铅盐都含有毒性,受重金属铅离子污染的水体对生物体有着巨大的毒害作用。针对含铅废水的除去问题,我们决定采用化学絮凝沉淀与微生物吸附剂联用的方法来处理。本文通过对五种混凝剂聚合氯化铝、聚合氯化铁、聚合硫酸铁、硫化钠、DTCR以及铝盐铁盐组合对不同进水铅浓度的模拟废水进行除铅处理实验,考察絮凝剂除铅效果并进行对比,确定最终除铅药剂为无机组合絮凝剂PAC/PFS。接着对筛选出的耐铅微生物吸附絮凝剂干菌对含铅废水的处理效果进行试验研究,考察微生物絮凝剂对无机组合絮凝剂的助凝效果。结果如下：(1)通过絮凝剂的筛选,确定无机组合混凝剂PAC/PFS为最终的除铅药剂。(2)耐铅微生物非活性吸附剂对铅离子有着较强的吸附作用,实验结果表明：溶液pH、絮凝剂投加量是影响该微生物非活性吸附剂的最主要的因素,而振荡时间、温度、摇床转速等也对其除铅效果产生一定的影响,但影响相对较小。(3)本实验结果表明结合少量微生物干菌的使用,能够提高无机组合絮凝剂对含铅废水的处理效果,降低无机组合混凝剂的投加量,并提高对含铅废水的处理效果。且微生物干菌对含铅废水的处理效果与PAC/PFS的比值没有直接关系,也就是说无机组合-微生物絮凝剂联合除铅,PAC/PFS仍可以以任意比例组合。无机组合-微生物絮凝剂处理含铅废水时最佳pH值为6,最佳投加顺序为先投加微生物絮凝剂后投加无机组合絮凝剂。
[Abstract]:At present, the environment is polluted by heavy metal more and more seriously, especially lead pollution to water environment. Lead and some soluble lead salts are toxic, and the water polluted by heavy metal lead ions has a great toxic effect on organisms. In view of the problem of removal of lead-containing wastewater, we have decided to use chemical flocculation precipitation and microbial adsorbent to treat it. In this paper, five coagulants, polyaluminium chloride, polyferric sulfate, sodium sulphide DTCR and aluminum salt iron salt, were used to treat simulated wastewater with different influent concentration of lead. The effect of flocculant on removing lead was investigated and compared. The final lead removal agent is the inorganic combined flocculant PAC / PFS. Then, the treatment effect of lead-tolerant microbial adsorptive flocculant dry bacteria on lead-containing wastewater was studied, and the effect of microbial flocculant on inorganic combined flocculant was investigated. The results were as follows: (1) through the selection of flocculants, the inorganic combined coagulant PAC/PFS was determined to be the ultimate lead removal agent. The results show that the pH of solution and the dosage of flocculant are the most important factors affecting the non-active adsorbent of the microorganism, and the oscillation time, temperature and rotating speed of shaking bed also have some effects on the removal of lead. The results showed that the treatment effect of inorganic combined flocculant on lead-containing wastewater could be improved and the dosage of inorganic composite coagulant could be reduced by combining with the use of a small amount of microbial dry bacteria. The treatment effect of lead-containing wastewater was improved. The treatment effect of microbial dry bacteria on lead-containing wastewater is not directly related to the ratio of PAC/PFS, that is to say, the combination of inorganic combination and microbial flocculant can still be combined with PAC- / PFS in any proportion. The optimum pH value of inorganic combination-microbial flocculant for treatment of lead-containing wastewater is 6, and the best addition order is to add microbial flocculant first and then inorganic combined flocculant.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X751

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