本文關(guān)鍵詞： 城市污泥 重金屬 電動修復(fù) 表征　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著中國經(jīng)濟(jì)的飛速發(fā)展和城鎮(zhèn)化進(jìn)程的不斷加快,我國城市污泥的產(chǎn)量也迅猛增加。城市污水中部分工業(yè)廢水的匯入,導(dǎo)致城市污泥中積累了一定量的重金屬,如果不對污泥中重金屬進(jìn)行去除或回收,不僅將嚴(yán)重影響著污泥農(nóng)用、堆肥、焚燒、填埋等后續(xù)處置方法的應(yīng)用,還會造成金屬資源的極大浪費(fèi)和經(jīng)濟(jì)損失。本文著眼于未來工業(yè)應(yīng)用,采用自行研發(fā)設(shè)計的雙層雙陽極裝置,利用乙二胺作為整合劑來強(qiáng)化去除和回收城市污泥中的重金屬,并對陰極沉淀產(chǎn)物進(jìn)行表征,以期探索工業(yè)上可行的城市污泥重金屬的去除和回收技術(shù)。(1)在綜合分析研究現(xiàn)狀、了解已有電解裝置局限的基礎(chǔ)上,自行設(shè)計制作了雙層雙陽極電動試驗裝置,新裝置能顯著提高污泥中重金屬的去除效率,且單次處理量大。預(yù)試驗表明,新裝置的污泥處理量由原來的2.5L提升到了 9L;Cu的去除率由原來的67.64%上升到了 76.02%,Pb的去除率由原來的57.79%上升到了 60.23%,Zn的去除率由原來的87.51%上升到了 89.13%。(2)電動去除和回收城市污泥中重金屬的試驗表明,綜合考慮去除效果和經(jīng)濟(jì)效益,本試驗確定的最佳電流密度為1.2nmA/cm~2。三組試驗中,Zn、Cu的最終去除率隨電流密度的增加而增大,而Pb、Cr的去除率卻隨著電流密度的增加先減小后增加。(3)乙二胺協(xié)同電動去除和回收城市污泥中重金屬的試驗表明:1)乙二胺的添加可以強(qiáng)化污泥中各重金屬的捕集和去除效果。2)乙二胺與污泥的體積比(V乙二胺/V污泥)為0.06時為最佳電流密度(1.2 mA/cm~2)下的最佳添加比。3)在電解過程中Cu、Pb、Cr三種含量較小的重金屬之間并不存在相互競爭關(guān)系,或者不存在明顯的競爭關(guān)系,三種金屬與Zn存在一定的競爭關(guān)系。(4)陰極沉淀產(chǎn)物的表征結(jié)果顯示,混合物中主要含有Zn、Fe、Cu、Cr、Na、Ca、K、Mg、Pb等9種金屬元素和Si、Cl、S等3種非金屬元素,且含量大小依次為ZnFeCuCrNaCaKSiMgPbClS。烘干后的陰極沉淀中最可能含有 ZnO、ZnS、CuS、CuO、PbS、PbO_2和KxCrO_2 等物質(zhì),其中 Zn 可能主要以ZnO和ZnS的形式存在,Cu可能主要以CuO和CuS的形式存在,Cr可能主要以KxCrO_2的形式存在,而Pb可能主要以PbS和PbO_2的形式存在。
[Abstract]:With the rapid development and urbanization China economy is accelerating, China's city sludge production has increased rapidly. Some industrial wastewater into the city sewage in the city, leading to heavy metals in sludge accumulated a certain amount of heavy metals in the sludge, if not for the removal or recovery, not only will affect agricultural sludge, compost. The application of incineration, landfill and other disposal methods, the metal will cause great waste of resources and economic losses. This paper focuses on the future of industrial application, using self-developed double anode device design, using ethylenediamine as chelating agent to enhance the removal and recovery of heavy metals in the sludge of city, and the products were characterized by cathode precipitation. Explore the removal of feasible city sludge heavy metal industry and recycling technology. (1) in the comprehensive analysis of the status quo, understand the existing electrolytic device limited basis On the designed double anode electric test device, the new device can significantly improve the removal efficiency of heavy metals in sludge, and a single large quantity. Pre test shows that the sludge treatment equipment from 2.5L to 9L; the removal rate of Cu increased from 67.64% to 76.02%. The removal rate of Pb increased from 57.79% to 60.23%, the removal rate of Zn increased from 87.51% to 89.13%. (2) shows that the test and recovery of heavy metals in sludge removal Electric City, considering the removal effect and economic benefits, the best current density was confirmed as the three group of 1.2nmA/cm~2. test, Zn the final Cu removal rate with the increase of current density increases, the removal rate of Cr and Pb, but with the increase of the current density decreased and then increased. (3) ethylenediamine synergy test and recovery of heavy metals in sludge removal Electric City show that: 1) The addition of the ethylenediamine heavy metal ions in the sludge collection and removal of.2 and the volume ratio of sludge) ethylenediamine (V ethylenediamine /V sludge) was 0.06 for the optimal current density (1.2 mA/cm~2) under the optimal add ratio.3) in the electrolysis process Cu, Pb, there is no competition between the heavy metal Cr three a content is small, or there is not a significant competitive relationship, there is competition between the three kinds of metal and Zn. (4) characterization of cathode precipitation product showed that the mixture contains Zn, Fe, Cu, Cr, Na, Ca, K, Mg, Pb and other 9 kinds of metal elements and Si and Cl, 3 kinds of metal elements such as S, and the size of the content in cathode ZnFeCuCrNaCaKSiMgPbClS. after drying the precipitate may contain ZnO, ZnS, CuS, CuO, PbS, PbO_2 and KxCrO_2 etc, in which Zn may mainly ZnO and ZnS exists in the form of Cu, CuO and CuS may be the main form of existence Cr. It can exist mainly in the form of KxCrO_2, and Pb may exist mainly in the form of PbS and PbO_2.

【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703

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