本文關(guān)鍵詞： 煉油廢水 傳統(tǒng)活性污泥工藝 兩級(jí)A/O工藝 模擬優(yōu)化　出處：《青島科技大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：目前對(duì)于煉油廢水處理的提標(biāo)方法主要是在生化單元后增加其他處理設(shè)備和工藝,增加了煉油廢水處理的能耗及成本。本文以某煉油廠煉油廢水第一、第二處理廠廢水處理工藝設(shè)施的實(shí)際運(yùn)行情況為例,應(yīng)用Bio Win 5.0軟件首先建立兩級(jí)A(厭氧)/O(好氧)工藝生化單元的ASDM數(shù)學(xué)模型,對(duì)兩級(jí)A/O工藝的生化處理單元進(jìn)行模擬優(yōu)化研究并進(jìn)行現(xiàn)場(chǎng)實(shí)驗(yàn)驗(yàn)證,再建立傳統(tǒng)活性污泥工藝模型,對(duì)傳統(tǒng)活性污泥工藝生化單元進(jìn)行模擬優(yōu)化研究:1、通過(guò)實(shí)驗(yàn)分別對(duì)兩級(jí)A/O工藝和傳統(tǒng)活性污泥工藝進(jìn)出水水質(zhì)進(jìn)行分析,實(shí)驗(yàn)檢測(cè)模型所需水質(zhì)常規(guī)組分和特殊組分。通過(guò)灼燒法測(cè)定各工藝曝氣池中的污泥濃度(MLSS)用于評(píng)估工藝運(yùn)行狀況和建立模型。兩級(jí)A/O工藝現(xiàn)場(chǎng)沉淀池存在跑泥現(xiàn)象,通過(guò)靜態(tài)濃縮實(shí)驗(yàn)校正兩級(jí)A/O工藝沉淀池模型。2、建立兩級(jí)A/O工藝模型,模擬工藝實(shí)際運(yùn)行狀況并校準(zhǔn)模型,并針對(duì)該工藝出水生化需氧量(COD)和總氮(TN)出水不達(dá)標(biāo)等問(wèn)題進(jìn)行模擬優(yōu)化。通過(guò)模擬優(yōu)化發(fā)現(xiàn),一級(jí)、二級(jí)O池溶解氧(DO)濃度對(duì)生化系統(tǒng)影響較小,維持在2mg/L即可,同時(shí)可節(jié)省曝氣能耗;為保證工藝COD出水達(dá)標(biāo),一級(jí)A/O的MLSS維持在4000 mg/L左右,二級(jí)A/O的MLSS維持在2000 mg/L左右,同時(shí)采用分段進(jìn)水,可提高TN處理效率,保證工藝TN出水達(dá)標(biāo)。通過(guò)現(xiàn)場(chǎng)部分實(shí)驗(yàn)驗(yàn)證的模型優(yōu)化結(jié)果,進(jìn)一步驗(yàn)證了所建模型以及模型模擬優(yōu)化方法的準(zhǔn)確性。由于第一處理廠的兩級(jí)A/O工藝模擬優(yōu)化后仍存在無(wú)法達(dá)標(biāo)的隱患,通過(guò)模擬對(duì)該工藝進(jìn)行改造優(yōu)化,將原工藝改造為水解池+一級(jí)A/O工藝,并將現(xiàn)場(chǎng)O池以及沉淀池并聯(lián)使用,增加硝化液回流,且無(wú)需添加Na OH溶液。并通過(guò)模擬選擇改造后工藝的最佳運(yùn)行方案,改造后的工藝條件參數(shù)如下:好氧曝氣池DO濃度保持在2mg/L,曝氣池的MLSS應(yīng)維持在3000~4000 mg/L,硝化液回流比為100%。改造后工藝較原工藝COD去除率提高2.5%,TN去除率提高19.6%,改造后優(yōu)化效果明顯。3、建立傳統(tǒng)活性污泥工藝模型,模擬工藝實(shí)際運(yùn)行狀況并校準(zhǔn)模型,并針對(duì)該工藝出水COD不穩(wěn)定、易超標(biāo)、出水TN無(wú)法達(dá)標(biāo)等問(wèn)題進(jìn)行模擬優(yōu)化。通過(guò)模擬優(yōu)化發(fā)現(xiàn),一級(jí)、二級(jí)O池DO濃度對(duì)系統(tǒng)影響較小,維持在2mg/L即可,同時(shí)可節(jié)省曝氣能耗;為保證工藝COD出水達(dá)標(biāo),一級(jí)曝氣池的MLSS維持在6000 mg/L左右,二級(jí)曝氣池的MLSS維持在2000 mg/L左右;分段進(jìn)水優(yōu)化對(duì)TN去除效果影響較小,工藝優(yōu)化無(wú)法使TN達(dá)標(biāo)排放,需要通過(guò)模擬對(duì)該工藝進(jìn)行改造優(yōu)化。將原工藝改造為A/O工藝,將現(xiàn)場(chǎng)一級(jí)曝氣池前半段改為厭氧段,將沉淀池并聯(lián)使用;針對(duì)工藝出水TN無(wú)法有效去除的情況,增加硝化液回流,且無(wú)需添加Na OH溶液。通過(guò)模擬選擇改造后工藝的最佳運(yùn)行方案,改造后的工藝條件參數(shù)如下:好氧曝氣池DO濃度保持在2mg/L,曝氣池的MLSS應(yīng)維持在3000~4000 mg/L,硝化液回流比為100%。改造后工藝較原工藝COD去除率提高3.12%,TN去除率提高36%,優(yōu)化效果明顯。
[Abstract]:The refinery wastewater treatment standard is the main method of increasing other processing equipment and technology in biochemical unit, increased energy consumption and cost of refinery wastewater treatment. In this paper a refinery refinery wastewater treatment facilities, second wastewater treatment plant operation situation as an example, using Bio Win 5 software is firstly established in two A (anaerobic) /O (aerobic) ASDM mathematical model of process of biochemical unit, biochemical treatment unit of two stage A/O process simulation and optimization research and field experiment, and then establish the conventional activated sludge process model, research on Simulation and optimization of conventional activated sludge biochemical unit: 1, through the experiment on two respectively. A/O process and conventional activated sludge process and water quality analysis, experimental testing model for conventional water quality and special compositions. Through the determination of the burning process in the aeration tank The sludge concentration (MLSS) was used to evaluate the operation condition and process model. The two stage A/O process on sedimentation tank sludge exist phenomenon, through the static concentration correction in two stage A/O process clarifier model.2, the establishment of two stage A/O process model, process simulation and actual operation condition and the calibration model, the effluent biochemical oxygen demand (COD) and total nitrogen (TN) of the water is not standard for simulation and optimization. It is found that, through the simulation and optimization of a grade, two grade O dissolved oxygen (DO) concentration had little effect on the biochemical system, can be maintained at 2mg/L, and can save the energy consumption of aeration; in order to ensure the process COD effluent standard, the level of A/O MLSS maintained at about 4000 mg/L, two A/O MLSS maintained at about 2000 mg/L, at the same time by step-feed, can improve the treatment efficiency of TN, ensure the process TN effluent standards. Through the optimization results of the model on experimental verification, further verified The model and simulation accuracy optimization method. Because there are still unable to reach the hidden dangers of simulation and optimization of two stage A/O process for the first treatment plant, through the simulation and optimization of the transformation process, the original process for the transformation of a hydrolysis pool + A/O process, and the scene to O pool and sedimentation tank used in parallel increase the nitrification liquid reflux without adding Na, OH solution. And the optimal operation scheme after the transformation process through the simulation, the following process parameters after the transformation of the aerobic aeration tank of DO concentration in 2mg/L, MLSS in aeration tank should be maintained at 3000~4000 mg/L, the nitrification liquid reflux ratio is 100%. after the transformation process is better than the original process for the removal rate of COD increased by 2.5%, the removal rate of TN increased by 19.6%, after the transformation of the optimization effect is obvious.3, a conventional activated sludge process model, process simulation and actual operation condition and the calibration model, the effluent COD is not stable, Easy to exceed the standard, the problem of effluent TN compliance can not simulated optimization. Found by simulation and optimization level, two level O pool DO concentration on the system has little effect, can be maintained at 2mg/L, and can save the energy consumption of aeration; in order to ensure the process COD effluent standard, an aeration tank MLSS is maintained at about 6000 mg/L, two aeration tank MLSS maintained at about 2000 mg/L; step-feed optimization have little influence on the removal of TN, process optimization can not make TN emission standards, through the simulation and optimization of the transformation process. The transformation process is A/O process, will be the scene of a stage aeration tank first half to anaerobic, the sedimentation tank according to the process used in parallel; the effluent TN can not effectively remove the situation, increase the nitrification liquid reflux, and there is no need to add Na OH solution. The optimal operation scheme of simulation selection after transformation process, the following conditions after the transformation parameters: Aerobic aeration tank DO When the concentration is kept at 2mg/L, the MLSS of the aeration tank should be maintained at 3000~4000 mg/L, and the reflux ratio of nitrifying liquid is 100%.. After transformation, the removal rate of COD is increased by 3.12% compared with the original process, and the removal rate of TN is increased by 36%, and the optimization effect is obvious.

【學(xué)位授予單位】：青島科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X742

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