本文選題：移動床生物膜反應(yīng)器　切入點：揮發(fā)酚　出處：《華南理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：酚類化合物是一種有毒污染物,對環(huán)境和人類有害,某石化公司的汽提凈化裝置出水(以下統(tǒng)稱煉油含酚廢水)含酚量較高,酚含量在150 mg/L~250 mg/L之間,直接排放將影響廢水生化處理系統(tǒng)穩(wěn)定運行和廢水處理達標排放,按照“污污分流與分治”的工藝設(shè)計,本文采用生物新技術(shù)對煉油含酚廢水進行預(yù)處理,自行設(shè)計具有內(nèi)循環(huán)功能的移動床生物膜反應(yīng)器(MBBR),目標使煉油含酚廢水的揮發(fā)酚平均去除率達80%以上,研究專屬微生物(噬酚菌)的培養(yǎng)馴化方法、最佳工藝參數(shù)和操作條件,為工業(yè)應(yīng)用提供設(shè)計參數(shù)和技術(shù)參考。完成的主要工作及結(jié)論如下:(1)MBBR反應(yīng)器的設(shè)計。該實驗裝置設(shè)計處理規(guī)模是500L/h,由兩級生物膜反應(yīng)器與沉淀池構(gòu)成,采用高性能的聚乙烯填料作為微生物載體,具有內(nèi)循環(huán)功能,大水量的內(nèi)循環(huán)水流既能稀釋和混合高濃度的含酚廢水,又能強化污染物在水相和生物相之間的傳質(zhì)效率。(2)MBBR反應(yīng)器的啟動。對噬酚菌的培養(yǎng)與馴化將采用靜態(tài)、動態(tài)結(jié)合的培養(yǎng)方法,反應(yīng)器內(nèi)有大量微生物生成,揮發(fā)酚、COD、p H的降解穩(wěn)定。(3)MBBR反應(yīng)器運行影響因素研究�？疾焖νＡ魰r間(HRT)、溶解氧(DO)和酸堿值(p H)對裝置運行的影響,最適宜HRT為10h,裝置中部廢水DO濃度應(yīng)維持1.0~3.0 mg/L,p H維持7.0~9.0之間,能夠保證噬酚菌處于高的生物活性狀態(tài)。(4)煉油含酚廢水可生化性研究。經(jīng)過兩級移動床生物膜反應(yīng)器處理后,煉油含酚廢水的平均BOD5/COD比值由0.45升至0.67,可生化性得到提高,有利于石化廠對出水的進一步處理,證明移動床生物膜反應(yīng)器對煉油含酚廢水有生物降解作用。(5)MBBR反應(yīng)器兩級串聯(lián)連續(xù)運行狀況分析。維持進水水量為500L/h,使HRT保持10h,氣水比維持在14:1~18:1,保證反應(yīng)器內(nèi)的溶解氧充足,裝置在最佳運行條件下連續(xù)運行28天,兩級串聯(lián)總揮發(fā)酚去除率為87.14%,總COD去除率為33.20%,裝置連續(xù)運行效果穩(wěn)定,污染物降解效果顯著。
[Abstract]:Phenolic compounds are toxic pollutants, which are harmful to the environment and human beings. The effluent of a petrochemical company's stripping purification plant (hereinafter referred to as the wastewater containing phenol in refinery) contains high phenol content, and the phenol content is in the range of 150 mg/L~250 / mg/L. Direct discharge will affect the stable operation of wastewater biochemical treatment system and the discharge standard of wastewater treatment. According to the process design of "decontamination and separation and treatment", a new biological technology is used to pretreat the wastewater containing phenol in oil refining. A moving-bed biofilm reactor with internal circulation function was designed to achieve an average removal rate of 80% or more of volatile phenol in the wastewater from oil refining. The culture and acclimation method, the optimum technological parameters and the operating conditions of the specialized microorganism (Phenophagobacteria) were studied. The main work and conclusions are as follows: 1. The design of MBBR reactor. The designed treatment scale of the device is 500L / h, which consists of a two-stage biofilm reactor and a sedimentation tank. High performance polyethylene filler is used as microorganism carrier, which has the function of internal circulation. The internal circulating water with large amount of water can not only dilute and mix the high concentration phenol wastewater, but also has the function of internal circulation. It can also enhance the mass transfer efficiency of pollutants between water phase and biological phase. The start-up of MBBR reactor. The culture and acclimation of phenolic bacteria will be carried out by static and dynamic combination, and a large number of microorganisms will be produced in the reactor. Study on the influencing factors of the degradation Stability of volatile Phenol (CODN) H. The effect of HRT (do) and pH value (pH) on the operation of MBBR reactor was investigated, and the effect of HRT (do) and pH value (pH) on the operation of MBBR reactor was investigated. The optimum HRT is 10 h, and the concentration of do in the wastewater of the middle part of the plant should be kept between 1.0 ~ 3.0 mg / L 路L ~ (-1) H, which can guarantee the biodegradability of phenolic bacteria in a high bioactivity state. The biodegradability of phenol-containing wastewater is studied. After two-stage moving bed biofilm reactor, the biodegradability of phenolic wastewater can be ensured by a two-stage moving bed biofilm reactor. The average BOD5/COD ratio of phenol wastewater increased from 0.45 to 0.67, and the biodegradability was improved, which was beneficial to the further treatment of effluent from petrochemical plants. It is proved that the moving bed biofilm reactor has biodegradable effect on the wastewater containing phenol in refinery. The two-stage continuous operation of the two-stage MBBR reactor is analyzed. The HRT is maintained at 500L / h, and the gas-water ratio is kept at 14: 1: 18: 1, which ensures the sufficient dissolved oxygen in the reactor. Under the optimum operating conditions, the removal rate of total volatile phenol and total COD were 87.14 and 33.20, respectively. The continuous operation effect of the plant was stable and the degradation effect of pollutants was remarkable.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X742

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