1. Research of Sludge Properties during Startup of Integrated Anoxic Aerobic Process
- Author
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Le Zhong Xu, Yong Fu Guo, Wei Jia Zhang, Yong Jian Liu, and Jin Yu Chu
- Subjects
Pollutant ,Wastewater ,Waste management ,Sedimentation (water treatment) ,Dyeing wastewater ,Scientific method ,General Engineering ,Environmental science ,Biodegradation ,Anoxic waters ,Mixed liquor suspended solids - Abstract
An integrated and three-dimensional anoxic-aerobic (A/O) process is put forward. The novel A/O process is used to treat printing and dyeing wastewater with concentrated sludge of sludge concentration tank as inoculated sludge. The experiment studies the sludge properties during startup of the A/O process. The results show that the inoculated sludge has completely adapted the quality of the wastewater after operation of 54 d. The average MLSS of A tank and O tank reach 7.26 g/L and 3.69 g/L at the end of the last stage, respectively. The ratios of MLVSS to MLSS in A/O reactor are stable at 0.63 - 0.75. And the sedimentation velocity of sludge has a large-scale promotion and reaches 34.2 m/h in A tank and 25 m/h in O tank, respectively. Simultaneously, the novel A/O reactor has high biodegradability for pollutants with CODcr removal efficiency of about 70%. The results indicate that the integrated A/O process will be a better method to treat printing and dyeing wastewater.
- Published
- 2012