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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Stability And Capacity Enhancements Of Activated Sludge Process By Ifas Technology
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Stability And Capacity Enhancements Of Activated Sludge Process By Ifas Technology

机译：Ifas技术提高活性污泥工艺的稳定性和容量

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This research was conducted to evaluate the capacity and stability of the Activated Sludge (AS) process retrofitted to the Integrated Fixed Film Activated Sludge (IFAS) process.Hydraulic retention time (HRT) and solids retention time (SRT) were used as independent variables in this investigation.The IFAS and AS processes were operated in parallel for carbon removal and nitrification at 6, 8, and 10 hours HRTs at which 4, 6, and 8 days SRTs were maintained.The AS system failed to attain steady state conditions at 10 hours HRT with 4 days SRT, 8 hours HRT with 4 and 6 days SRTs, and 6 hours HRT with 4, 6, and 8 days SRTs, whereas the IFAS system was stabilized until the SRT and HRT were at 4 days and 6 hours, respectively.Excessive filamentous microorganisms were observed in the IFAS and AS systems as the results of completely-mixed condition and high readily biodegradable organic content in the wastewatcr.The filamentous bulking was apparently the cause of system failure and the reduction of nitrification in the AS system.As the HRTs and SRTs were decreased or the system loadings increased, it was clearly demonstrated that the IFAS system was higher in capacity and stability than the AS system.The attached biomass in the IFAS system suppressed the growth of filamentous microorganisms by reducing the amount of substrates in contact with the filamentous microorganisms providing the system stability.Nitrification was completed in the IFAS system and could be independent of the suspended SRT.Both AS and IFAS systems could provide the same performance for COD removal at the experimental conditions.
机译：本研究旨在评估改型为集成固定膜活性污泥（IFAS）工艺的活性污泥（AS）工艺的能力和稳定性。在此，将水力停留时间（HRT）和固体停留时间（SRT）作为自变量。 IFAS和AS流程在6、8和10小时的HRT上并行运行以去除碳和硝化，并维持4、6和8天的SRT.AS系统无法在10时达到稳态使用4天SRT的HRT小时，使用4天和6天SRT的8小时HRT，使用4天，6天和8天SRT的6小时HRT，而IFAS系统则一直稳定到SRT和HRT分别为4天6小时，在IFAS和AS系统中，由于完全混合的条件和废水中易生物降解的有机物含量高而导致的丝状微生物过多，丝状膨大显然是系统故障和还原的原因。随着HRT和SRT的减少或系统负荷的增加，IFAS系统的容量和稳定性明显高于AS系统.IFAS系统中附着的生物量抑制了系统的生长。通过减少与丝状微生物接触的底物的数量来提供丝状微生物，从而提供系统稳定性。硝化作用在IFAS系统中完成，并且可以独立于悬浮的SRT.AS和IFAS系统都可以在相同的条件下去除COD实验条件。

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