本文關(guān)鍵詞： 脫硫廢水 物化法 零排放 吸附 蒸發(fā)結(jié)晶　出處：《武漢科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：燃煤電廠脫硫廢水污染物種類繁多,懸浮物、含鹽量、重金屬離子(鎘、汞、鉻、鉛、鎳等)、氟化物、硫化物、COD等指標(biāo)含量都超過(guò)國(guó)家排放標(biāo)準(zhǔn),對(duì)環(huán)境的污染性很強(qiáng),若直接排放,將嚴(yán)重影響環(huán)境,進(jìn)一步威脅人們的身體健康。因此,研究脫硫廢水綜合利用技術(shù),通過(guò)廢水回用,實(shí)現(xiàn)脫硫廢水“零排放”,有重要的環(huán)境效益、經(jīng)濟(jì)效益以及社會(huì)效益。本文主要通過(guò)正交試驗(yàn)確定了物化法及吸附法對(duì)江蘇某燃煤電廠脫硫廢水預(yù)處理的最優(yōu)操作參數(shù),再采用蒸發(fā)結(jié)晶法對(duì)預(yù)處理后的脫硫廢水進(jìn)行深度處理,回用廢水并回收廢水中的工業(yè)鹽,實(shí)現(xiàn)脫硫廢水零排放。本論文主要研究結(jié)果如下:物化法主要包含中和沉淀、硫化物沉淀和混凝,正交試驗(yàn)確定的燃煤電廠脫硫廢水物化法預(yù)處理的最佳工藝條件為:中和沉淀反應(yīng)的pH=9,攪拌速度200 r/min,攪拌時(shí)間20 min,鎘、鉛、鎳離子的去除率分別為97.14%、69.13%及79.81%;硫化物沉淀反應(yīng)控制硫化鈉加入量21 mg/L,攪拌速度200 r/min,攪拌時(shí)間40 min,鉛離子去除率達(dá)80.94%;混凝反應(yīng)加入混凝劑PAFS 2.5 mL/L和助凝劑PAM 2.0mL/L,濁度降低了91.3%。以生物炭為原料,制備出KOH活化、磁性和賦硫三種生物質(zhì)活性炭;改性制備的三種生物質(zhì)活性炭的各項(xiàng)孔結(jié)構(gòu)參數(shù)均大于未改性的原料生物炭;KOH改性的活性炭的酸性基團(tuán)羧基顯著增加,內(nèi)酯基減少;磁性活性炭的羧基略有增加,內(nèi)酯基和酚羥基減少,羰基增加;賦硫活性炭的羧基增加,內(nèi)酯基和羰基減少。實(shí)驗(yàn)考察了pH值、溫度、時(shí)間三種吸附條件對(duì)Pb(Ⅱ)、Cd(Ⅱ)、Ni(Ⅱ)的吸附影響,研究結(jié)果表明三種重金屬離子的最佳吸附pH值均為6;脫硫廢水的吸附過(guò)程中,各種重金屬離子之間存在競(jìng)爭(zhēng)吸附,去除效果為Cd(Ⅱ)Ni(Ⅱ)Pb(Ⅱ),鎘抑制鉛和鎳的吸附,綜合比較,磁性活性炭對(duì)重金屬離子混合體系的吸附效果較好。蒸發(fā)結(jié)晶深度處理時(shí),當(dāng)蒸發(fā)速率為50 mL/h,加入2%晶種時(shí),得到的工業(yè)鹽粒度分布均勻,平均粒度達(dá)414μm;工業(yè)鹽產(chǎn)品質(zhì)量達(dá)到GB/T 5462-2003《工業(yè)鹽》的國(guó)家精制工業(yè)鹽二級(jí)標(biāo)準(zhǔn);冷凝水水質(zhì)達(dá)到GB/1576-2008《工業(yè)鍋爐水質(zhì)》的給水標(biāo)準(zhǔn)。
[Abstract]:The coal-fired power plant desulfurization wastewater pollutant variety, suspended solids, salinity, heavy metals (cadmium, mercury, chromium, lead, nickel), fluoride, sulfide, COD and other indicators were more than the national emission standards, environmental pollution is very strong, if the direct emissions, will affect the environment seriously, further threatening the people health. Therefore, the comprehensive utilization technology of desulfurization wastewater, the wastewater reuse, the desulfurization wastewater "zero emissions" has significant environmental benefits, economic benefits and social benefits. This paper mainly through orthogonal test to determine the physicochemical method and adsorption method for the optimal operation parameters of pretreatment desulfurization wastewater in a coal-fired power plant in Jiangsu then, the evaporation crystallization method for the advanced treatment of desulfurization wastewater after pretreatment, wastewater reuse and recycling of industrial salt wastewater, desulfurization wastewater to achieve zero emissions. The main results are as follows: the main physicochemical method Including neutralization precipitation, sulfide precipitation and coagulation, orthogonal test to determine the coal-fired power plant desulfurization wastewater by physicochemical pretreatment and the optimum conditions were: the precipitation reaction of pH=9, stirring speed of 200 r/min, stirring time 20 min, cadmium, lead, nickel ion removal rates were 97.14%, 69.13% and 79.81%; sulfide precipitation the reaction control of sodium sulfide dosage 21 mg/L, stirring speed of 200 r/min, stirring time of 40 min, the lead ion removal rate was 80.94%; the coagulation reaction adding coagulant and coagulant aid PAFS 2.5 mL/L PAM 2.0mL/L, 91.3%. in turbidity reduced biological carbon as raw material, prepared by KOH activation, magnetic and sulphur of three kinds of biomass activity carbon; the pore structure parameters of three kinds of biomass activated carbon prepared were higher than that of unmodified carbon raw materials; carboxylic acid groups of KOH modified activated carbon increased significantly, lactone reduction; magnetic activated carbon with carboxyl radical Increase, lactone and phenolic hydroxyl carbonyl reduction, increasing sulphur; activated carbon increased lactone carbonyl and carboxyl, reduced. The effects of pH value, temperature, time of the three kinds of adsorption conditions on Pb (II), Cd (II), Ni (II) the effect of adsorption, the results show that the optimum adsorption of pH three kinds of heavy metal ions was 6; adsorption desulfurization wastewater, the competitive adsorption existed between various heavy metal ions, the removal effect of Cd (II) Ni (II) Pb (II), the adsorption of cadmium, lead and nickel in the suppression of a comprehensive comparison, better absorption effect of magnetic activated carbon mixed system for heavy metal fitting the depth of treatment. Ion evaporation and crystallization, when the evaporation rate is 50 mL/h, with 2% seed, the granularity of industrial distribution, the average particle size of 414 mu m; refining industrial salt two national standard of industrial product quality reached GB/T 5462-2003< salt industrial salt >; water quality reached the GB/1576-2008< industry Water quality of boiler > water supply standard.

【學(xué)位授予單位】：武漢科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X773

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Mark Yarbrough;馬明;;零液體排放系統(tǒng)對(duì)未來(lái)電廠設(shè)計(jì)的影響[J];電力建設(shè);2007年01期

，

本文編號(hào)：1519176