本文選題：環(huán)境工程學(xué) + 處理?xiàng)l件��； 參考：《安全與環(huán)境學(xué)報(bào)》2016年06期

【摘要】：通過TCLP毒性程序浸出試驗(yàn),以砷、鉻浸出質(zhì)量濃度為控制指標(biāo),對含砷、鉻廢水處理產(chǎn)生的沉渣穩(wěn)定性進(jìn)行了研究,并結(jié)合廢水中砷、鉻去除率,確定該廢水的最佳處理?xiàng)l件。在常溫下,通過調(diào)節(jié)pH值、Fe~(2+)/Cr~(6+)物質(zhì)的量比、Ca/As物質(zhì)的量比、曝氣時(shí)間等條件對處理工藝進(jìn)行優(yōu)化,考察不同處理?xiàng)l件對廢水砷、鉻去除率及沉渣砷、鉻浸出質(zhì)量濃度的影響。結(jié)果表明,pH值為6、Fe~(2+)/Cr~(6+)物質(zhì)的量比為8、Ca/As物質(zhì)的量比為5、曝氣時(shí)間為50 min時(shí),不僅Cr(Ⅵ)、總鉻、總砷的排放質(zhì)量濃度達(dá)到了GB 8978—1996《污水綜合排放標(biāo)準(zhǔn)》的要求,總砷、總鉻的浸出質(zhì)量濃度也分別降低到0.78 mg/L、0.59 mg/L,遠(yuǎn)低于GB/T 5085.3—2007《危險(xiǎn)廢物鑒別標(biāo)準(zhǔn):浸出毒性鑒別》規(guī)定的質(zhì)量濃度,達(dá)到了安全堆放要求。對曝氣產(chǎn)生的絮體進(jìn)行XRD測試,結(jié)果表明,余留的Fe~(2+)經(jīng)曝氣氧化后產(chǎn)生的絮體是一種無定型態(tài)的氫氧化鐵或水合氧化鐵,其富含陽離子空位和OH-基團(tuán),能增加砷、鉻的去除率。對優(yōu)化前后的沉渣進(jìn)行SEM掃描,結(jié)果表明,對各因素進(jìn)行優(yōu)化能增大沉渣的粒徑,提高沉渣的穩(wěn)定性。
[Abstract]:The stability of the sediment produced by the treatment of arsenic and chromium wastewater was studied by using the TCLP toxic procedure leaching test and the mass concentration of arsenic and chromium leached as the control index. The optimum treatment conditions of the wastewater were determined by combining with the removal rate of arsenic and chromium in the wastewater. At room temperature, the treatment process was optimized by adjusting the quantity ratio of the pH value of Fe ~ (2 +) / Cr ~ (1 +) ~ (6) and the mass ratio of Ca / as, aeration time, and so on. The effects of different treatment conditions on the removal rate of arsenic and chromium and the concentration of arsenic and chromium in the sediment were investigated. The results show that the mass concentration of Cr (鈪，

本文編號：1992494