厌氧水解酸化-好氧氧化A_1/A_2/O工艺剩余污泥减量影响因素

Factors Affecting Residual Sludge Reducing by Anaerobic Hydrolysisacidification and Aerobic Oxidation Process of A_1/A_2/O Bio-Treatment System

厌氧水解酸化-好氧氧化工艺实现剩余污泥减量，不需要高温、高压、强氧化剂或强碱性等破坏微生物细胞结构的强化措施，可操作性和经济性良好．污泥减量系统的主要目的是实现对污染物的降解，系统污泥减量效果与系统的有机负荷、水力停留时间、温度等因素有关，并受这些因素影响．在碱减量印染废水A1／A2／O生物处理系统，把剩余污泥回流到A1段、利用水解酸化和好氧氧化工艺实现对剩余污泥减量的试验表明：A1段容积负荷（COD）在2．54kg·（m^3·d）^-3、水力停留时间为7．56h、温度在2512～4012，系统在长期运行可以实现对系统污泥的有效减量和对废水处理达标排放要求（GB8978—96一级标准）．污泥回流到A，段进行减量，细胞中N、P的释放可以有效克服碱减量印染废水中N、P不足的缺点，大大降低向系统添加N、P营养物的费用．

Hydrolysis-acidification and aerobic oxidation process could realize sludge reducing without those strengthening conditions such as high temperature, high pressure, strong oxidant or alkali which may destroy the cell structure of microorganisms, so it has good maneuverability and is economical. The purpose of sludge reducing system is mainly to degrade the pollutants in it ant its reducing effect is related to organic loading, HRT and temperature, etc. In the A1/A2/O bio-treatment system dealing with alkali minimization and dyeing-printing wastewater, residual sludge can be reduced effectively by recycling sludge to A1 segment. It proved that sludge could be reduced effectively and treated water could reach the grade I standard of GB8978-96 for long time operation of the system, when the volume loading of A1 （COD） was 2.54 kg· （m^3·d） - l, the HRT of A1 was 7.56h and the temperature of the system was 2512 -4012. The sludge reducing could be realized through recycling to A1 segment, and the N, P released from the broken bacteria cell could compensate the shortage of N and P of alkali minimization and dyeing-printing wastewater, and then the cost of adding the nutrition of N and P to the system could be reduced greatly.