改性活性炭对石煤提钒废水中低浓度NH3-N和V等的吸附

为研究石煤提钒离交尾水的深度处理技术,利用质量分数为1%、5%和10%的过氧化氢溶液对ZWY15型活性炭进行改性,得到3种改性活性炭即1%AC、5%AC和10%AC;探讨其对该废水中低浓度的NH3-N、V等的吸附效果。实验结果表明:AC或改性AC的加入可使废水的碱度升高,随着吸附时间及吸附剂投加量的增加,升高幅度增大,且不同改性AC对废水碱度提高的幅度不同;相较于未改性活性炭,过氧化氢改性活性炭对V的吸附效果明显提高,去除率最大可提高30%,对NH3-N的去除率提升约11%;当投加量为60 g/L时,10%AC可使废水中V的浓度降低至1.88 mg/L,此时废水中Cr、Cd和Zn的浓度分别降低至0.006、0.010和0.036 mg/L,均低于《钒工业污染物排放标准》(GB26452-2011)所规定的排放限值。

Adsorption of low concentrated NH3-N and V etc. from wastewater produced in vanadium extraction from stone coal using modified activated carbons

In order to investigate the advanced treatment method of ion-exchange wastewater produced in vanadium extraction from stone coal, Type ZWY15 activated carbon was modified by using 1%, 5% and 10% mass fractions hydrogen peroxide, and produced three kinds of modified activated carbons which were 1%AC, 5%AC and 10%AC. The adsorption effect of the modified ACs of low-concentration NH₃-N and V etc. in the wastewater was studied. Test results showed that the adding of AC or modified AC can increase the alkalinity of the wastewater. The longer the adsorption time or the bigger the adsorbent dosage, the higher the increasing amplitude of alkalinity will be. And the increasing amplitude of alkalinity can be different because of adding different modified ACs. The adsorption effect of V is significantly improved by modified ACs, the removal rate of V increases 30% at maximum, and that of NH₃-N increases about 11%. When the adding dosage is 60 g/L, the 10%AC can decrease the concentration of V in the wastewater to 1.88 mg/L, meanwhile the concentrations of Cr, Cd and Zn in the wastewater reduce to 0.006 mg/L, 0.010 mg/L and 0.036 mg/L, respectively which are all lower than the emission limits in Discharge Standard of Pollutants for Vanadium Industry GB 26452-2011.