發(fā)布時(shí)間：2018-07-20 14:27

【摘要】：有機(jī)硅生產(chǎn)過程中會(huì)產(chǎn)生大量含高濃度有機(jī)物的重金屬廢水;這種具有較強(qiáng)毒性的廢水若不經(jīng)有效處理,將對生態(tài)環(huán)境和人類健康產(chǎn)生重大影響。本課題對有機(jī)硅生產(chǎn)企業(yè)產(chǎn)生的高濃度有機(jī)物的含鋅廢水進(jìn)行處理研究,分別比較了“中和+微濾法”、“光催化+中和+微濾”、“電凝聚法”、“電凝聚+中和+微濾法”、“微濾+電凝+中和+微濾”對廢水的處理效果,確定其中的最佳方案及其參數(shù)。通過實(shí)驗(yàn)研究表明:(1)“中和+微濾法”方法處理廢水,pH值為10條件下,處理后廢水COD從2000mg/L下降為789mg/L,去除率為60.55%;Zn2+出水濃度由40 mg/L降低至0.624mg/L,去除率為98.44%;(2)“臭氧光催化+中和+微濾”廢水,控制初始pH為4,光催化2h,臭氧投加量為45mg/min。處理后,廢水COD能從2000mg/L下降為531mg/L,去除率為73.45%;Zn2+濃度由40 mg/L降低至0.513mg/L,去除率為98.72%;(3)“電凝聚法”處理廢水,控制電流密度為7.0 A/m2,電凝時(shí)間45min,極板間距為2cm。處理后,廢水COD從2000mg/L降為454 mg/L,去除率為77.30%;Zn2+濃度由40 mg/L下降為6.081mg/L,去除率為84.80%。(4)“電凝聚+中和+微濾法”處理廢水,使得出水COD由2000mg/L降低至342mg/L,去除率為82.90%;Zn2+濃度由40 mg/L降低至0.162mg/L,去除率為99.59%;(5)“微濾+電凝聚+中和+微濾法”處理廢水,出水COD由2000mg/L下降至265 mg/L,去除率為86.75%;Zn2+濃度由40 mg/L下降至0.034mg/L,去除率為99.91%。通過對上述五種廢水處理方案的比較,雖然“中和+微濾”、“光催化+中和+微濾”、“電凝聚+中和+微濾”、“微濾+電凝聚+中和+微濾法”都能使得出水Zn2+濃度達(dá)標(biāo),但是“中和+微濾”、“光催化+中和+微濾”處理后的COD和Zn2+濃度依然較高�！半娔�+中和+微濾”、“微濾+電凝聚+中和+微濾法”處理的Zn2+濃度則低很多,達(dá)到99.5%以上的去除率,COD較之前的方法也有進(jìn)一步降低。對于復(fù)雜多變的實(shí)際廢水而言,為保證較低的Zn2+出水濃度,應(yīng)選擇“電凝聚+中和+微濾法”和“微濾+電凝聚+中和+微濾法”處理該類廢水的最佳方式。
[Abstract]:A large number of heavy metal wastewater containing high concentrations of organic compounds will be produced in the process of organic silicon production, which will have a significant impact on the ecological environment and human health if the wastewater with strong toxicity is not effectively treated. In this paper, the treatment of zinc-containing wastewater of high concentration organic matter produced by organic silicon production enterprises was studied. The methods of neutralization microfiltration, photocatalytic neutralization and microfiltration, electrocoagulation were compared respectively. The treatment effect of "electrocoagulation neutralization microfiltration" and "microfiltration electrocoagulation neutralization microfiltration" on wastewater was determined, and the optimum scheme and its parameters were determined. The experimental results show that: (1) under the condition of pH 10, the "neutralization microfiltration" method is used to treat wastewater. The COD of treated wastewater decreased from 2000 mg / L to 789 mg / L, and the removal rate was 60.55 mg / L from 40 mg / L to 0.624 mg / L, and the removal rate was 98.44 mg / L; (2) "ozone photocatalytic neutralization and microfiltration" wastewater, controlling initial pH 4, photocatalysis 2 h, ozone dosage 45 mg / min. After treatment, COD can be reduced from 2000 mg / L to 531 mg / L, the removal rate is 73.45 mg / L from 40 mg / L to 0.513 mg / L, and the removal rate is 98.72; (3) the current density is 7.0 Am ~ (2), the electrocoagulation time is 45 min, and the plate spacing is 2 cm 路L ~ (-1). After treatment, the COD of wastewater decreased from 2000mg / L to 454 mg / L, the removal rate was 77.30mg / L, the concentration of Zn2 decreased from 40 mg / L to 6.081mg / L, and the removal rate was 84.80%. (4) the electrocoagulation neutralization microfiltration method was used to treat wastewater. The COD of effluent was reduced from 2000mg / L to 342mg / L, the removal rate was 82.90% and the concentration of Zn2 was reduced from 40 mg / L to 0.162 mg / L, and the removal rate was 99.59; (5) the "microfiltration coagulation neutralization and microfiltration process" was used to treat wastewater. The effluent COD decreased from 2000 mg / L to 265 mg / L, the removal rate was 86.75 mg / L and the concentration of Zn2 decreased from 40 mg / L to 0.034 mg / L, and the removal rate was 99.91%. Through the comparison of the five wastewater treatment schemes mentioned above, although "neutralization microfiltration", "photocatalytic neutralization microfiltration", "electrocoagulation neutralization microfiltration", The concentration of Zn2 in effluent can be up to standard by "microfiltration coagulation and neutralization microfiltration", but the COD and Zn2 concentrations are still high after "neutralizing micro-filtration" and "photocatalytic neutralization microfiltration". The concentration of Zn2 treated by "electrocoagulation neutralization microfiltration" and "microfiltration coagulation neutralization microfiltration method" is much lower, and the removal rate of COD is more than 99.5%. For the complex and changeable wastewater, in order to ensure the lower concentration of Zn2 effluent, the best way to treat this kind of wastewater should be selected, which is "electrocoagulation neutralization microfiltration method" and "microfiltration coagulation neutralization microfiltration method".
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：X783

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