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环境科学 2006
Residual Sludge Reducing by Anaerobic Hydrolysis-acidification and Aerobic Oxidation Process of A1/A2/O Bio-treatment System
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Abstract:
In the A1/A2/O bio-treatment system treating alkali minimization and dyeing-printing wastewater,with the function of hydrolysis-acidification in A segments and aerobic oxidation in O segment,residual sludge could be reduced effectively by recycling of sludge to A1 segment.Meantime,the observed sludge yield coefficient declined and the sludge produced in O segment decreased.The anaerobic hydrolysis-acidification and aerobic oxidation A1/A2/O process realized the sludge reducing by the three segments conjunctly,i.e.recycled sludge was liquefied and inactivated in A1 segment and then intensified in A2 segment,while the assimilating function in O segment was weakening gradually.During the 6-month dynamic-experiment,it has been tested that the reduction rate of residual sludge in the system reached to 67.87% and the observed sludge yield coefficient of O segment decreased to 45.5% of the initial stage when the volume loading(CODCr) was 2.54kg·(m3·d)-1 and the HRT was 7.56h in A1 segment.Meanwhile,the MLVSS/MLSS]value of the sludge in A1 segment was reducing from(0.718?2) to(0.592 2) and that of the sludge in A2 from(0.667 3) to(0.526 7.) Study on the sludge particle size distribution of every segment also demonstrated that sludge reducing and mineralization occurred when sludge was inactivated gradually in the A1 and A2 segments.
