The management of sludge-settling properties in Nordic conditions is of importance during the low temperature (spring) season because of the peak settler load. A survey was made in 10 Finnish waste water treatment pla...The management of sludge-settling properties in Nordic conditions is of importance during the low temperature (spring) season because of the peak settler load. A survey was made in 10 Finnish waste water treatment plants(WWTP's) and the total extended filament length and DSVI in half of the plants exceeded the limits, which indicates sludge bulking(15 km/g SS and 150 ml/g respectively). The dominant organism was Microthrix parvicella, the abundance of which was 59.22% of total extended filament length on average. Chemicals were tested to control the filaments, and it was found that special attention has to be paid to maintaining the nitrification at low temperature. A dosage of(H_2O_2-based) oxidants controlled the growth of Microthrix parvicella effectively and rapidly, whereas with the use of aluminium hydroxidechloride a 2 to 5-week period was needed to decrease the filament length.展开更多
提出调控工艺局部污泥负荷分布来处理污水处理厂冬季微丝菌污泥膨胀。在某AAO工艺污水处理厂开展平行反应器实验,进行显微观测和工艺模拟,发现反应器前端厌/缺氧区污泥去除负荷的差值与微丝菌丰度、污泥粒径和沉降性能有相关性。比较多...提出调控工艺局部污泥负荷分布来处理污水处理厂冬季微丝菌污泥膨胀。在某AAO工艺污水处理厂开展平行反应器实验,进行显微观测和工艺模拟,发现反应器前端厌/缺氧区污泥去除负荷的差值与微丝菌丰度、污泥粒径和沉降性能有相关性。比较多种运行模式的改善效果,发现AO模式沉降性能最好,优于AAO和多点回流。反应器前端污泥去除负荷梯度可作为调控指标,实验中AO模式负荷梯度可达0.54 kg COD·(kg SS·d)^(-1),明显高于AAO、多点回流和多点进水。因此,通过优化回流和排泥操作,可以调控污泥去除负荷的沿程分布,有可能缓解冬季的微丝菌型污泥膨胀。展开更多
针对由微丝菌引起的城市污水处理厂营养物去除系统的活性污泥膨胀,采用投加次氯酸钠进行氧化控制,探讨不同剂量下次氯酸钠对微丝菌的杀灭效果、活性污泥沉降性能的改善以及对功能微生物(聚磷菌)的损伤和恢复。结果表明,次氯酸钠使裸露...针对由微丝菌引起的城市污水处理厂营养物去除系统的活性污泥膨胀,采用投加次氯酸钠进行氧化控制,探讨不同剂量下次氯酸钠对微丝菌的杀灭效果、活性污泥沉降性能的改善以及对功能微生物(聚磷菌)的损伤和恢复。结果表明,次氯酸钠使裸露于絮体外的菌丝断裂,污泥容积指数减小;随着非丝状菌的增殖和剩余污泥排出,活性污泥沉降性能进一步改善;次氯酸钠的投加量越高,对聚磷菌吸磷和释磷速率影响越大,但聚磷菌释磷速率减小的幅度小于吸磷速率。最佳投药量为5.3 g Cl/kg MLSS,此时SVI由未投加次氯酸钠时的202 m L/g降至134 m L/g,最大释磷速率和最大吸磷速率同比分别降低了11%和40%。可见,投加次氯酸钠能有效控制微丝菌引起的污泥膨胀。展开更多
文摘The management of sludge-settling properties in Nordic conditions is of importance during the low temperature (spring) season because of the peak settler load. A survey was made in 10 Finnish waste water treatment plants(WWTP's) and the total extended filament length and DSVI in half of the plants exceeded the limits, which indicates sludge bulking(15 km/g SS and 150 ml/g respectively). The dominant organism was Microthrix parvicella, the abundance of which was 59.22% of total extended filament length on average. Chemicals were tested to control the filaments, and it was found that special attention has to be paid to maintaining the nitrification at low temperature. A dosage of(H_2O_2-based) oxidants controlled the growth of Microthrix parvicella effectively and rapidly, whereas with the use of aluminium hydroxidechloride a 2 to 5-week period was needed to decrease the filament length.
文摘提出调控工艺局部污泥负荷分布来处理污水处理厂冬季微丝菌污泥膨胀。在某AAO工艺污水处理厂开展平行反应器实验,进行显微观测和工艺模拟,发现反应器前端厌/缺氧区污泥去除负荷的差值与微丝菌丰度、污泥粒径和沉降性能有相关性。比较多种运行模式的改善效果,发现AO模式沉降性能最好,优于AAO和多点回流。反应器前端污泥去除负荷梯度可作为调控指标,实验中AO模式负荷梯度可达0.54 kg COD·(kg SS·d)^(-1),明显高于AAO、多点回流和多点进水。因此,通过优化回流和排泥操作,可以调控污泥去除负荷的沿程分布,有可能缓解冬季的微丝菌型污泥膨胀。
文摘针对由微丝菌引起的城市污水处理厂营养物去除系统的活性污泥膨胀,采用投加次氯酸钠进行氧化控制,探讨不同剂量下次氯酸钠对微丝菌的杀灭效果、活性污泥沉降性能的改善以及对功能微生物(聚磷菌)的损伤和恢复。结果表明,次氯酸钠使裸露于絮体外的菌丝断裂,污泥容积指数减小;随着非丝状菌的增殖和剩余污泥排出,活性污泥沉降性能进一步改善;次氯酸钠的投加量越高,对聚磷菌吸磷和释磷速率影响越大,但聚磷菌释磷速率减小的幅度小于吸磷速率。最佳投药量为5.3 g Cl/kg MLSS,此时SVI由未投加次氯酸钠时的202 m L/g降至134 m L/g,最大释磷速率和最大吸磷速率同比分别降低了11%和40%。可见,投加次氯酸钠能有效控制微丝菌引起的污泥膨胀。
