本文選題：電解錳 + 廢水��； 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：近年來,電解錳行業(yè)的迅速發(fā)展極大地帶動(dòng)了當(dāng)?shù)氐慕?jīng)濟(jì)發(fā)展,但同時(shí)也帶來了嚴(yán)重的環(huán)境污染問題。電解錳生產(chǎn)過程產(chǎn)生的環(huán)境污染以廢水污染最為嚴(yán)重,其中含有錳和氨氮等有害物質(zhì),而且廢水懸浮物多,色度大,排放到環(huán)境中對(duì)生態(tài)環(huán)境和人體健康會(huì)造成嚴(yán)重的威脅。目前我國(guó)電解錳企業(yè)幾乎都沒有配套專門針對(duì)廢水中氨氮的處理設(shè)施,多為直接排放,因此必須采取措施對(duì)氨氮廢水進(jìn)行控制。本文針對(duì)重慶某電解錳廠的氨氮廢水,分別對(duì)采用電化學(xué)法和化學(xué)沉淀法處理電解錳生產(chǎn)過程廢水和錳渣滲濾液中的氨氮。研究結(jié)果主要如下:①本論文采用DSA陽(yáng)極,采用電化學(xué)氧化法對(duì)電解錳過程廢水中的氨氮進(jìn)行了研究,探討了氨氮電化學(xué)氧化的影響因素。實(shí)驗(yàn)發(fā)現(xiàn),氨氮的直接電氧化效果不明顯,而在有氯離子存在的情況下,具有較好的間接氧化效果。為了避免了添加氯離子帶來的二次污染,本文設(shè)計(jì)了隔膜電解槽,采用電化學(xué)法同時(shí)去除廢水中的錳離子和氨氮。實(shí)驗(yàn)探討了NO2-和NH4+摩爾比、槽電壓和初始p H值等因素對(duì)氨氮去除的影響。在最佳條件下,初始濃度為120mg/L的氨氮廢水處理后,97.2%的氨氮得以去除。此外,實(shí)驗(yàn)采用循環(huán)伏安技術(shù)研究了氨氮在鉑電極上的電催化反應(yīng)過程和特征。在最佳實(shí)驗(yàn)條件下,使用該工藝處理電解錳廢水,氨氮和錳的濃度可以達(dá)到國(guó)家排放標(biāo)準(zhǔn)(15mg/L、2mg/L)。②研究發(fā)現(xiàn)磷酸銨鎂結(jié)晶法可以有效處理錳渣滲濾液中的氨氮。本文探討了各影響因素對(duì)氨氮去除的影響,Mg Cl2·6H2O和Na2HPO4·12H2O沉淀劑組合對(duì)氨氮的去除效果最好,處理的最佳p H值為8,Mg2+:NH4+:PO43-摩爾比為1.2:1:1,處理后氨氮的濃度低于15mg/L。通過XRD分析、FTIR分析和掃描電鏡分析表明,沉淀產(chǎn)物的主要成分為磷酸銨鎂,且為粗糙的不規(guī)則晶體。同時(shí),為了減少處理成本,實(shí)現(xiàn)沉淀產(chǎn)物資源化及循環(huán)利用的目的,根據(jù)沉淀物的性質(zhì),實(shí)驗(yàn)研究了沉淀產(chǎn)物熱解循環(huán)處理,當(dāng)熱解溫度為90~100℃,OH-:NH4+為1:1時(shí),熱解時(shí)間3小時(shí)時(shí),通過XRD分析、FTIR分析證明產(chǎn)物為Mg Na PO4。在氨氮廢水中加入熱解產(chǎn)物Mg Na PO4,NH4+可以置換出Mg Na PO4中的Na+,生成Mg NH4PO4,達(dá)到沉淀物循環(huán)利用的目的。
[Abstract]:In recent years, the rapid development of electrolytic manganese industry has greatly promoted the local economic development, but also brought serious environmental pollution problems. The environmental pollution caused by electrolytic manganese production is the most serious in wastewater, which contains harmful substances such as manganese and ammonia nitrogen, and the waste water has many suspended substances and a large chroma, which will cause a serious threat to the ecological environment and human health when discharged into the environment. At present, almost all the electrolytic manganese enterprises in our country have no supporting facilities for the treatment of ammonia nitrogen in wastewater, most of which are direct discharge. Therefore, some measures must be taken to control the ammonia nitrogen wastewater. This paper deals with the treatment of ammonia nitrogen in wastewater from electrolytic manganese production process and leachate from manganese slag by electrochemical method and chemical precipitation method respectively. The main results are as follows: in this paper, the ammonia nitrogen in wastewater from electrolytic manganese process was studied by using DSA anode and electrochemical oxidation method, and the influencing factors of ammonia nitrogen electrochemical oxidation were discussed. It was found that the direct electrooxidation effect of ammonia nitrogen was not obvious, but the indirect oxidation effect was better in the presence of chloride ions. In order to avoid the secondary pollution caused by the addition of chloride ions, a diaphragm electrolytic cell was designed to remove manganese ion and ammonia nitrogen from wastewater simultaneously by electrochemical method. The effects of the molar ratio of no ~-and NH _ 4, the cell voltage and the initial pH value on the removal of ammonia nitrogen were investigated. Under the optimum conditions, 97.2% ammonia nitrogen can be removed after the treatment of the wastewater with an initial concentration of 120 mg / L ammonia nitrogen. In addition, cyclic voltammetry was used to study the electrocatalytic reaction process and characteristics of ammonia nitrogen on platinum electrode. Under the optimum experimental conditions, the ammonia nitrogen and manganese concentration can reach the national discharge standard (15 mg / L 2 mg / L) 2. 2. The results show that the ammonium magnesium phosphate crystallization method can effectively treat ammonia nitrogen in manganese slag leachate. In this paper, the effects of various factors on ammonia nitrogen removal are discussed. The best removal effect of ammonia nitrogen is obtained by the combination of mg Cl 2 6H 2O and Na 2HPO 4 12H 2O precipitators. The best pH value of the treatment is 8 mg 2: NH 4: PO 43 mol ratio of 1.2: 1: 1, and the concentration of ammonia nitrogen after treatment is less than 15 mg / L. The results of XRD FTIR and SEM show that the main component of the precipitated product is magnesium ammonium phosphate and it is a rough irregular crystal. At the same time, in order to reduce the treatment cost and realize the purpose of recycling and recycling the precipitation product, the pyrolysis cycle treatment of the precipitation product was studied according to the properties of the precipitate. The pyrolysis time was 3 hours when the pyrolysis temperature was 90 ~ 100 鈩，

本文編號(hào)：2050967