1. The main technical and economic indexes of process selection include: treatment of unit water investment, reduction of unit pollution investment, treatment of unit water consumption and cost, reduction of unit pollutant power consumption and cost, occupation of land, operation performance reliability, management and maintenance of the degree of difficulty, overall environmental benefits and so on.
2. Urban wastewater treatment technology should be selected according to the treatment scale, water quality characteristics, environmental functions of the receiving water body, local actual conditions and requirements, and selected after comprehensive technical and economic comparison.
3. It is necessary to determine the influent water quality of sewage, optimize the parameters of process design, and make a detailed investigation or determination of the current water quality characteristics of sewage, and make a reasonable analysis and prediction. The composition of water quality is complex. When special, the dynamic test of sewage treatment process should be carried out, and the pilot study should be carried out if necessary.
4. The new process should be adopted actively and prudently. For the new process that is applied for the first time, it must pass pilot test and production test, and provide reliable design parameters before application.
5. In the construction of the same sewage plant by stages, the same process should be adopted in each stage, and the construction scale of each stage should be the same as possible.
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