传统铁碳微电解填料在除磷过程中出现的填料板结、沟流等问题不但会导致水体除磷效果降低,而且填料上脱落的碳颗粒导致产泥量增大还会增加后续处理成本。为此,采用铁基材料和碳纤维组成的新型铁碳微电解材料为除磷材料,以碳纤维、铁基材料等除磷材料为对照,考察了新型铁碳微电解材料对武汉市某湖泊水体总磷的去除效果及不同处理时间对水体总铁浓度和浊度的影响。结果表明:间歇曝气处理10 h,新型铁碳微电解材料、铁基材料和碳纤维对水体磷的去除率分别为80.00%、76.73%、2.86%;铁碳微电解处理72 h后静置96 h,水体总磷浓度从静置前的0.052 mg/L降至0.012 mg/L,水体总磷达《地表水环境质量标准》(GB 3838—2002)Ⅱ类标准,水体浊度和水体总铁浓度均变化不明显,最终分别为4.14 NTU和0.089 mg/L;悬挂于水体中的新型铁碳微电解材料未出现填料板结、沟流等现象,且水处理过程中仅产生铁絮凝物,克服了传统铁碳填料中因碳颗粒脱落导致产泥量增大等问题,提高了水体磷的去除率,而且水体浊度和总铁浓度增加不明显。研究成果有助于探寻水体富营养化治理的新途径。
Abstract
The filler compaction and channeling during the phosphorus removal by traditional iron-carbon micro-electrolysis fillers not only undermine the removal effect, but also increase the amount of mud produced by carbon particles from the filler and raise the subsequent processing cost. In view of this, a new type of iron-carbon micro-electrolysis material composed of iron-based materials and carbon fiber was employed to remove total phosphorus in a lake in Wuhan. The removal effect and the influence of treatment time on total iron concentration and turbidity of water were also examined with comparisons with those of carbon fiber and iron-based materials. Results demonstrated that treated for 10 hours with intermittent aeration, the phosphorus removal rate by the present iron-carbon micro-electrolysis material, iron-based material, and carbon fiber were 80.00%, 76.73%, and 2.86%, respectively. Treated for 72 hours with iron-carbon micro-electrolysis and placed static for 96 hours, the total phosphorus concentration in water dropped from 0.052 mg/L to 0.012 mg/L, reaching class II standard in Surface Water Environmental Quality Standard (GB 3838-2002). The turbidity and total iron concentration in water barely changed, stabilizing at 4.14 NTU and 0.089 mg/L, respectively. Moreover, no filler compaction or channeling was observed for the new iron-carbon micro- electrolysis material suspended in the water body. Only iron floc was produced in the water treatment process, which overcame the increase in mud production caused by the loss of carbon particles in traditional iron-carbon filler. Therefore, the new type iron-carbon micro-electrolysis material can overcome the problems of filler compaction, channeling and large mud production in traditional iron-carbon micro-electrolysis reaction process, and in the meantime enhance the phosphorus removal rate with no evident increase in turbidity and total iron concentration.
关键词
新型铁碳微电解材料 /
湖泊水体 /
富营养化 /
总磷 /
总铁 /
浊度
Key words
iron-carbon micro-electrolysis material /
lake water /
eutrophication /
total phosphorus /
total iron /
turbidity
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基金
湖北省技术创新专项重大项目(2017ABA073);长江科学院技术开发和成果转化推广项目(CKZS2017008/SH)
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