【導(dǎo)讀】A2O-MBR反應(yīng)器在17LMH流量下連續(xù)運(yùn)行210天。然后在兩周內(nèi)逐步提高設(shè)。熱化學(xué)消化污泥運(yùn)行在一個(gè)固定的pH. 值和溫度(75℃)下，可溶解的COD含量為25%。過程被送回厭氧罐。污泥的厭氧消化對(duì)COD和總磷的去除沒有任何影響。運(yùn)行中,MBR通過膜過濾壓差保持相對(duì)穩(wěn)定。研究結(jié)果表明,所提出的流程配置在不降低處理。水水質(zhì)的情況下，有可能減少剩余污泥的產(chǎn)生。剩余污泥的減少和脫氮除磷是污水處理廠兩個(gè)相關(guān)的重要課題。MBR過程由于具有更長(zhǎng)。泥的產(chǎn)量大概降低28-68%，這取決于所用的污泥齡。在MBR反應(yīng)器內(nèi)這個(gè)問題可以通過引進(jìn)污泥分解技術(shù)來解決。解和生化處理是污泥減量化處理的基礎(chǔ)。在這些分解技術(shù)中，熱化學(xué)分解法被認(rèn)為是最簡(jiǎn)單。是在有氧與缺氧交替的情況下通過聚磷微生物的過度攝取而達(dá)到的。此外，工業(yè)化對(duì)磷資源的需求在不斷地增長(zhǎng)，在許。較低的轉(zhuǎn)速混合，以保證混合物中的懸浮固體始終處于懸浮狀態(tài)。濾膜的工作面積為。第38天時(shí)MLSS的濃度已經(jīng)達(dá)到8100mg/L。

　　

【正文】 oncluded that PAO anisms were not affected by thermo chemical pretreatment and TP in the effluent was found to be less than 1 mg/L throughout the study period. presents data on phosphorus profile of the sludge during the thermo chemical digestion. In the process of thermo chemical digestion, the bound phosphorous in the biosolids was solubilised and released into the solution. The phosphorous solubilisation was found to be in the range of 4550%. The alkali increases the pH of the digested mixed liquor and was in the range of . This high pH range was favorable for phosphorous removal using calcium salt. The phosphorous removal in the supernatant was carried out using lime at a mole ratio of :1. Fig. 4 explain nitrification and denitrification processes in the A2OMBR system. Nitrification is the primary important process in removing total nitrogen from the wastewater. Inplete nitri fication decreases TN removal efficiency of the system (Morita et al., 2021 and Choi et al., 2021). Dissolved oxygen (DO) is the principal parameter that controls nitrification. Nitrification efficiency goes down when DO decreases below mg/1 (Bane et al., 2021). To ensure plete nitrification the DO in the aerobic basin was maintained around mg/1. In the second step of nitrogen removal process, the nitrate formed by nitrification was reduced into nitrogen gas in the absence of dissolved oxygen called anoxic denitrification (Peng et al., 2021). From Fig. 4 it is evident that not all nitrate species enter into anoxic basin get reduced. The nitrate concentration was found to be in the range of 46 mg/L indicating denitrification process was inplete. Fig. 5 explains TN removal efficiency of the A2OMBR system. It is evident from the figure that the nitrogen removal efficiency of A2O system was remain unaffected during the entire period of study. The influent TN was found to be 40 mg/L. During the initial phase of operation (120 days) the TN removal was in the range of 5055%. Sludge disintegration did not have any influence over TN removal efficiency of the system and was varied between 60% and 67% throughout the study period. TN concentration in the effluent was found to be in the range of 1418 mg/L. During the study period, the transmembrane pressure increased slowly and at the end of 210 days of reactor operation the TMP was found to be 6cmHg. It appears that the sludge disintegration system does not play role in membrane fouling. Similar to our study, while working on sludge reduction practices in MBR, Young et al. (2021) have reported that the alkaline treatment of sludge didn39。t cause membrane fouling. 4. Conclusions Stable operation of MBR process was possible without significant accumulation of biomass when a part of the biological solids were disintegrated with alkali at pH 11 and temperature 75℃ Thermo chemical sludge digestion favors the recovery of phosphorous in the supernatant using calcium salts. The system can run for a long period of time with any further detoriation in TP removal efficiency. Further studies focusing on fate of disintegrated sludge are in progress. Acknowledgements This work was partly supported by the GS group of panies and Brain Korea 21 program from the Korean Ministry of Education References 1. Akin, ., Ugurlu, A., 2021. The effect of an anoxic zone on biological phosphorus removal by a sequential batch reactor. Bioresour. Technol. 94, 17 2. APHA, 2021. Standard Methods for the Examination of Water and Wastewater, 21 st ed. American Public Health Association, American Water Works Association,Water Pollution and Control Federation, Washington, DC 3. Banu, ., Uan, I., Yeom, LT., 2021. Effect of ferrous sulphate on nitrification during simultaneous phosphorous removal from domestic wastewater using laboratory scale anoxic/oxic reactor. World J. Microbiol. Biotechnol. 24, 29812986 4. Choi, H., Jeong, Sw， Chung, Y 一 2021. 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