Effects of aluminum ions on acid production and organic substance release in waste activated sludge diges-tion by Autothermal Thermophilic Micro-Aerobic Digestion (ATMAD)
LIU Yi-wei, GAO Chun-di, BI Hao-hua, OU Jia-li, XING Yi-yan, PENG Yong-zhen
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China
Abstract：In order to exploit and use the organic matter in the fermentation liquid, the study added various dosage of AlCl3•6H2O to the sludge digestion system which using the technology of Autothermal Thermophilic Micro-Aerobic Digestion (ATMAD), the thesis discussed about the impacts of aluminum ions (Al3+) on transformation rule of organic substance, volatile fatty acid (VFA), ammonia nitrogen (NH4+-N) and orthophosphate (PO43--P) in the course of ATMAD. The results promoted that the conversion and degradation of organic substance was inhibited, meanwhile, the content and composition of dissolved organic substance in sludge digestion solution was changed when Al3+was existing in the system of ATMAD. The maximum production of VFA in contrast group was 6.9 multiple than experimental group with the concentration of Al3+ was 1.0g/L. When the process of ATMAD digestion ended, the concentration of NH4+-N was 502.06mg/L in the reactor which the concentration of Al3+ was 1.0g/L, in the contrast group the concentration of NH4+-N just was 334.41mg/L. The activity of microorganisms declined when Al3+ present in the system of ATMAD. It can be concluded that Al3+ have negative impacts on sludge digestion and stabilization. It's advisable to avoid adding excessive aluminum ions in sludge ATMAD system to ensure the digestion system can fully produce acid and release organic substance, which will be used as high-quality carbon for biological nitrogen removal.
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