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 Version
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