GFH用于提高再生水回用景观水水质研究

研究了再生水回用于景观水体过程中,GFH(granulated ferric hydroxide)对磷、DOM和氮等污染物的吸附去除机制.结果表明,GFH对磷的去除效果最显著,TP浓度为0.059～0.725mg/L、PO34--P浓度为0.004～0.684mg/L的进水,GFH出水能够实现TP0.05mg/L(去除率91.1%)、PO43--P0.023mg/L(去除率95.4%);GFH优先去除DOM中大分子的腐殖酸,实现对DOM28.5%的去除率,同时提高DOM的芳香性;由于GFH和臭氧的强氧化性,再生水中NH4+-N和NO2--N可发生硝化反应,NH4+-N平均去除率达37.3%,NO2--N平均去除率达59%.

Application of GFH in the Municipal Effluent Reuse for Landscape

In order to prevent increased algae growth for the reuse of reclaimed water as landscape water, the removal mechanism of phosphate, DOM and nitrogen by adsorption onto GFH was studied. The result showed that the removal rate of phosphate was the highest, when the influent concentration of TP was 0.059-0.725 mg/L, and the concentration of PO4(3-) -P was 0.004-0.684 mg/L, the effluent concentration of TP was less than 0.05 mg/L(removal rate was 91.1%), and of PO4(3-) -P was less than 0.023 mg/L(removal rate was 95.4%) by adsorption onto GFH. GFH could remove macromolecular DOM (mainly fulvic acids) preferentially, and removal rate of DOM was 28.5%, but which would improve the aromaticity proportion of DOM. Because of the strong oxidizing property of GFH and O3, NH4(+) -N and NO2(-) -N occurred nitrification in reclaimed water, the average removal rates of NH4(+) -N and NO2(-) -N were 37.3% and 59% respectively.