【摘要】：目前對污泥絲狀菌膨脹的研究主要關(guān)注出水水質(zhì)和沉降性等特征,而鮮有關(guān)于活性污泥微生物生理狀態(tài)的報(bào)道.針對這一問題,采用降低SBR系統(tǒng)中溶解氧(DO)這一引發(fā)污泥絲狀菌膨脹的典型條件,研究了污泥絲狀菌膨脹過程中微生物受沖擊過程中呼吸圖譜與親和系數(shù)的變化.結(jié)果表明,降低DO初期,微生物進(jìn)入生理適應(yīng)期,其特征為活性污泥內(nèi)源比耗氧呼吸速率(SOURe)突然上升,自養(yǎng)菌比耗氧呼吸速率(SOURn)大幅下降,異養(yǎng)菌比耗氧呼吸速率(SOURc)小幅下降后迅速上升,同時(shí)氧親和系數(shù)KO突增;維持低DO時(shí)期特征為出水水質(zhì)和沉降性惡化,但SOURn和SOURc均恢復(fù)至較高水平,且COD親和系數(shù)KS和氧親和系數(shù)KO逐步減小,從理論上證明了低DO環(huán)境下足夠的水力停留時(shí)間可以使出水水質(zhì)更好,也就說明微生物通過適應(yīng)性調(diào)整可以適應(yīng)低DO環(huán)境,從呼吸代謝和動力學(xué)參數(shù)的角度驗(yàn)證了"低氧曝氣理論"的可行性.研究成果對于污水處理廠節(jié)能提供新的理論支持.
[Abstract]:At present, the research on the expansion of the filamentous bacteria of the sludge mainly focuses on the characteristics of water quality and sedimentation, but few reports about the physiological state of the activated sludge. In order to solve this problem, a typical condition of reducing the amount of dissolved oxygen (DO) in the SBR system is used to expand the filamentous bacteria of the sludge, and the change of the respiration pattern and the affinity coefficient during the expansion of the filamentous fungus of the sludge is studied. The results showed that, in the early stage of DO, the microorganisms enter the physiological period, which is characterized by a sudden increase of the endogenous specific oxygen-consumption respiration rate (SOURe) of the activated sludge, a significant decrease in the respiration rate of the autotrophic bacteria (SOURn) and a rapid rise in the rate of respiration of the heterotrophic bacteria (SOURc) after a small decrease in the oxygen-consuming respiration rate (SOURc), at the same time, the oxygen affinity coefficient KO is increased; the low DO period is maintained to be characterized in that the water quality and the sedimentation property of the effluent are deteriorated, but both the SOURCE and the SOURc are recovered to a higher level, and the COD affinity coefficient KS and the oxygen affinity coefficient KO are gradually reduced, It is proved theoretically that sufficient hydraulic retention time in the low DO environment can make the water quality better, and the feasibility of the "low-oxygen aeration theory" is verified from the angle of the respiratory metabolism and the kinetic parameters. The research results provide new theoretical support for the energy-saving of the sewage treatment plant.
【作者單位】： 西安建筑科技大學(xué)環(huán)境與市政工程學(xué)院西北水資源與環(huán)境生態(tài)教育部重點(diǎn)實(shí)驗(yàn)室;挪威科技大學(xué)土木與環(huán)境工程系;
【基金】：陜西省住房和城鄉(xiāng)建設(shè)廳科技計(jì)劃項(xiàng)目(2015-K63) 西安市社會發(fā)展引導(dǎo)計(jì)劃-社會發(fā)展科技示范項(xiàng)目(2016063SF/SF09)
【分類號】：X172

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