本文選題：石化二級出水　切入點(diǎn)：微絮凝砂濾工藝　出處：《長安大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：石油化工廢水具有排放量大、組分復(fù)雜、難去除等特點(diǎn),是工業(yè)廢水處理領(lǐng)域的研究熱點(diǎn)。經(jīng)過常規(guī)生物處理的石化二級出水往往還含有大量難去除的有機(jī)物質(zhì),隨著水質(zhì)排放標(biāo)準(zhǔn)的逐步提高,需要對二級出水進(jìn)行深度處理。本研究采用微絮凝砂濾工藝對石化二級出水進(jìn)行了深度處理的試驗(yàn)研究,主要研究結(jié)論如下:燒杯試驗(yàn)中,采用PAC作為投加劑,較佳參數(shù)條件為:攪拌時(shí)間6min、投加量為30mg/L,COD、TP的平均去除率分別為28.95%、60.15%,干污泥產(chǎn)量為0.028g/L,絮體粒徑可成長至117.02μm,Zeta電位值為-0.887mV;采用PAFC作為投加劑試驗(yàn)較佳參數(shù)條件為:攪拌時(shí)間6min、投加量為30mg/L,COD、TP的平均去除率分別為30.15%、63.18%,干污泥產(chǎn)量為0.0204g/L,絮體粒徑可成長至87.32μm,Zeta電位值為-0.485m V。微絮凝砂濾工藝中試試驗(yàn),以PAC作為絮凝劑,投加量為30mg/L時(shí),COD、TP、濁度去除率分別為33.28%、81.11%、86.02%。以PAFC為絮凝劑,投加量為30mg/L時(shí),COD、TP、濁度去除率分別為34.27%、85.05%、87.78%。以PAC為投加絮凝劑改變?yōu)V速、氣水比優(yōu)化出最終的最佳參數(shù)組合為:進(jìn)水流量為500L/h,即濾速為7m/h,投加量為30mg/L,氣量為16.5L/m2.s,氣水比為3:1。對最佳運(yùn)行參數(shù)條件下微絮凝砂濾工藝處理前后水樣的有機(jī)物分子量分布研究得出:微絮凝砂濾工藝優(yōu)先處理對象主要是大于3K大分子有機(jī)物;對三維熒光特性變化研究表明:該工藝不能有效去除或削減類芳香族蛋白質(zhì)有機(jī)物、類溶解性微生物代謝產(chǎn)物、腐植酸;對特征有機(jī)物的變化情況測定得出:該工藝對石化污水二級出水主要存在的不飽和烴、苯系物、酮、酯等特征有機(jī)物均難以有效去除。處理量為6500t/h,則所消耗的能源動(dòng)力成本為0.04206元/噸。投加量為30mg/L時(shí),PAC、PAFC處理成本這算成污水處理成本分別為0.05786元/噸、0.06286元/噸。
[Abstract]:Petrochemical wastewater, with the characteristics of large discharge, complex components and difficult to remove, is a research hotspot in the field of industrial wastewater treatment. The secondary effluent of petrochemical industry after conventional biological treatment often contains a large number of organic substances which are difficult to remove. With the improvement of water quality standard, advanced treatment of secondary effluent is needed. In this study, advanced treatment of secondary effluent of petrochemical industry was carried out by micro-flocculation sand filtration process. The main conclusions are as follows: in beaker test, Using PAC as additive, The optimum parameters are as follows: stirring time is 6 min, the average removal rate of 30 mg / L CODTP is 28.95g / L 60.15, the dry sludge yield is 0.028 g / L, the particle size of flocs can grow to -0.887mV, and the best parameter condition of using PAFC as adding agent is as follows: when mixing, the optimum parameters are as follows: when mixing, the sludge yield is 0.028 g / L, and the particle size can grow to 117.02 渭 m Zeta potential value of -0.887mV. In 6 min, the average removal rate of 30 mg / L CODN TP was 30.15 ~ 63.18, the dry sludge yield was 0.0204 g / L, and the particle size of the flocs could grow to -0.485m V with the Zeta potential of 87.32 渭 m 路m ~ (-1) 路min ~ (-1). When PAC was used as flocculant, the turbidity removal rate of 30mg/L was 33.2881.11 and 86.02, respectively. When PAFC was used as flocculant and 30mg/L was added, the turbidity removal rate was 34.27 ~ 85.05 and 87.78 respectively. The filtration rate was changed by adding PAC as flocculant. The optimal parameters are as follows: the influent flow rate is 500L / h, that is, the filtration rate is 7m / h, the dosage is 30mg / L, the gas volume is 16.5 L / m ~ 2 路s, and the gas-water ratio is 3: 1.The organic content of water sample before and after the treatment of micro-flocculation sand filtration process under the optimal operating parameters is obtained. The results show that the priority of micro-flocculation sand filtration process is more than 3K macromolecular organic matter. The results showed that the process could not effectively remove or reduce the aromatic protein-like organic compounds, soluble microbial metabolites, and humic acid. It is concluded that the main unsaturated hydrocarbons, benzenes and ketones in the secondary effluent of petrochemical wastewater by this process are determined by the change of characteristic organic matter. It is difficult to remove the characteristic organic matter such as ester effectively, the energy power cost is 0.04206 yuan / ton when the treatment capacity is 6500t / h, and the cost of 30mg/L is 0.05786 yuan / ton and 0.06286 yuan / ton respectively, the cost of wastewater treatment is 0.05786 yuan / t ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1).
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X78

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