【摘要】：飲用水源的復(fù)合污染及其健康風(fēng)險控制是當(dāng)前飲用水水質(zhì)凈化面臨的重要難題,其中對飲用水中消毒副產(chǎn)物的控制工作為重中之重。作為消毒副產(chǎn)物的主要前驅(qū)物質(zhì),水源中碘離子和天然有機(jī)物-碘離子復(fù)合污染產(chǎn)生的潛在健康危害十分顯著。飲用水處理中工藝中,混凝能有效去除水中有機(jī)污染物,我國傳統(tǒng)水處理工藝中混凝法具有明顯的經(jīng)濟(jì)可行性優(yōu)勢。本研究以碘離子和NOM(Natural organic matter,天然有機(jī)物)-碘離子復(fù)合污染為研究對象,采用FeCl_3·6H_2O和HPAC(High poly aluminium Chloride,高聚合氯化鋁)這2種混凝劑進(jìn)行燒杯試驗,改變混凝劑投加量、控制pH值、加入共存離子和生物聚合物等條件,考察這2種混凝劑對碘離子和NOM-碘離子復(fù)合污染的去除效果,確定相應(yīng)的最佳投加量和最佳pH值條件,并通過控制混凝劑的投加量和水樣的pH值,考察混凝對濁度的去除和Zeta電位的變化,探討混凝機(jī)理。研究發(fā)現(xiàn),混凝劑最佳投加量為0.5mmol/L,低pH值(pH6)有利于去除水樣中碘離子且HPAC的去除率高于FeCl_3·6H_2O的去除率,去除NOM-碘離子復(fù)合污染的最佳pH值為7。共存離子對去除飲用水源中碘離子及NOM-碘離子復(fù)合污染沒有影響。生物聚合物有助于去除飲用水中溶解性有機(jī)物,其投加量為1mg/L時,混凝去除NOM-碘離子復(fù)合污染的效果最佳。在本研究所采用的實驗條件下,UV254和TOC(Total organic carbon,總有機(jī)碳)之間存在著高度相關(guān)關(guān)系�；炷^程中發(fā)揮主要作用的機(jī)理隨著操作條件的變化而改變;對于FeCl_3·6H_2O來說,在混凝過程中,不僅電性中和發(fā)揮作用,吸附-架橋和網(wǎng)捕-卷掃也同樣發(fā)揮作用;對于HPAC來說,在混凝過程中,吸附-架橋和網(wǎng)捕-卷掃發(fā)揮主要作用。保持水樣呈中性有利于達(dá)到良好的混凝處理效果。
[Abstract]:The compound pollution of drinking water source and its health risk control are the important problems of drinking water quality purification at present, among which the control of disinfection by-products in drinking water is the most important. As the main precursor of disinfection by-product, the potential health hazard caused by the compound pollution of iodine ion and natural organic-iodine ion in water source is very significant. In the process of drinking water treatment, coagulation can effectively remove organic pollutants in water. In this study, iodine ion and NOM (Natural organic matter, natural organic matter)-iodine ion compound pollution as the research object, using FeCl_3 6H_2O and HPAC (High poly aluminium Chloride, high polyaluminium chloride) two kinds of coagulant to carry on the beaker experiment, change the dosage of coagulant, control the pH value, By adding coexisting ions and biopolymer, the removal effect of the two coagulants on the compound pollution of iodine ion and NOM- iodine ion was investigated, and the optimum dosage and the optimum pH value were determined. By controlling the dosage of coagulant and the pH value of water sample, the removal of turbidity and the change of Zeta potential were investigated, and the coagulation mechanism was discussed. It was found that the optimal dosage of coagulant was 0.5 mmol / L, and the low pH value (pH6) was beneficial to the removal of iodine ion in water samples, and the removal rate of HPAC was higher than that of FeCl_3 6H_2O, and the optimal pH value of removing NOM- iodide compound pollution was 7. Coexisting ions have no effect on the removal of iodine ion and NOM- iodide compound pollution in drinking water source. Biopolymer is helpful to remove dissolved organic compounds in drinking water. When the dosage of biopolymers is 1mg/L, coagulation is the best way to remove NOM- iodide compound pollution. There was a high correlation between UV254 and total organic carbon (TOC) of TOC (Total organic carbon, under the experimental conditions. The mechanism that plays a major role in the coagulation process changes with the change of the operating conditions. For FeCl_3 6H_2O, it is not only electrically neutralized, but also adsorption-bridging and trapping / scrubbing also play a role in the coagulation process; for HPAC, In the coagulation process, adsorption-bridge and net-sweep play a major role. Keeping the water sample neutral is beneficial to the good coagulation effect.
【學(xué)位授予單位】：首都經(jīng)濟(jì)貿(mào)易大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU991.2

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