| 摘要 |
A versatile and efficient biological wastewater treatment system is provided which is adaptable to small, shop fabricated package plants and large, assembled in place plants, and which can be operated as a secondary treatment, activated sludge process, for suspended solids and Biochemical Oxygen Demand (BOD) removal, or a tertiary treatment, activated sludge process, for suspended solids, Biological Oxygen Demand (BOD), Nitrogen and Phosphorous removal. The system major equipment includes a wastewater pump and an air aspirator-mixer to provide aeration, sludge recirculation and waste, and wastewater recirculation for the secondary and tertiary treatment processes. The aeration system with the air aspirator-mixer is highly efficient in oxygen transfer to the wastewater, easy to maintain and versatile to use, as it is located outside aeration tanks. The wastewater pump and air aspirator-mixer system lends itself to continuous and cyclic aeration and oxic and anoxic treatment processes. The multiple use of the wastewater pump for aeration, recirculation and sludge waste minimizes the number of pumping systems required and eliminates air blowers.
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