| 英文摘要 |
The optimum parameters of the scum avoided layer selection are arranged by Taguchi Arrays. Seven designs of experiment were chosen. After the first screening stage, based on the results, the optimum parameter was selected from Fig4.1 the scum weight contour line which graphs by the JMP software. For further consideration, the scum avoided layer would hold the scum under the board which could improve the organic matter dissolved. Besides, three tracer experiments are set up. Pouring into the tracer in the tank for detecting the outlet tracer conductivity and then calculate the average detention time. All the three deviations of results are less than 3%, so there is no short-circuiting in the three sets. The hydraulic behavior is similar to plug flow in the unit which is added with the round-the-end boards and the cross boards. Most of sewage stayed in the unit until the detention time.
The scope of work for the phase II is designed based on a logic procedure that has been applied in many of the sewage treatment field. Both of technical issue and application investigation are addressed. Other than the hardware construction, the system’s treatment ability study and application investigation of the sewage treatment system will be conducted during phase II so that a feasible work plan for the sewage reuse demonstration project can be submitted.
There two systems are constructed based on the phase I results and balance equations. One is called as the checking set, the other is a comparison set. For the technical issue, the continuous sewage running test and system capability test are proceeding. The outlet BOD5、SS concentration for each system is less than 10ppm after a few days. There is little scum in the checking system, but the comparison one with more scum on the surface. The scum would become hard after a period of time in the comparison system. The BOD5、SS concentration will be 50% of the influent sewage after the round-the-end board and cross board in the checking system, but the comparison system is only 25% after unit I treatment.
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