Abstract
The statistics about investment and operation situation of 36 urban sewage treatment plants and 72 country ones show that: ①Urban and country sewage treatment plants are mainly small-scale ones, using oxidation ditch, A2/O, SBR and its variants process. ②Operation loading rates of urban and county sewage treatment plants are generally low, and the better treatment process varies with different scales. ③The unit investment and unit investment of pipe network decreases with the scale increasing. So does the trend of operating cost. Overall, the operating costs of the A2/O and the oxidation ditch are cheaper in urban wastewater treatment plants, while each process are more economical in country ones. Therefore, choosing reasonable process, and coordinating the relationship between centralization and decentralization play an irreplaceable role in the coordinated development of the Guangxi autonomous region in the future, saving money under the premise of ensuring the safety of water environment.
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