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In view of the needs of secondary water quality evaluation and intelligent operation and maintenance management, the data quality evaluation of two major secondary water supply online monitoring indicators (residual chlorine and turbidity) was carried out, and the variance analysis and covariance analysis of the impact factors of the water quality of the four major secondary water supply were proposed, and the water quality evaluation method of secondary water supply online monitoring based on K-means clustering method and entropy value method was proposed, which was applied in the secondary water supply management system of L City, and the evaluation results provided an important reference for the secondary water supply manager. Evaluation methods can be widely applied in the water quality management of secondary water supply. [ABSTRACT FROM AUTHOR]

The increasing production of excess sludge has become a serious problem that plagues the development of Chinese sewage treatment industry. Ultrasonic technology (high-intensity ultrasound) has attracted the attention of researchers because of its advantage of reducing sludge production from the source. The principle and main influencing factors of ultrasonic sludge process reduction technology are introduced. The current research status of improving the sludge process-reduction rate and reducing energy consumption was reviewed, including the combination of ultrasound and physicochemical method or traditional sewage biological treatment process. There is a contradiction between the sludge reduction and deterioration of effluent quality in the combination of ultrasound and traditional wastewater biological treatment process. Combining the advantages of low-intensity ultrasound to increase the biological activity of sludge and promote the shortcut nitrification process, a method of new wastewater biological treatment process (partial nitrification-denitrification (PND) and partial nitrification/partial denitrification-anammox (PN/PD-A)) coupled with different intensity ultrasound was summarized and its technical advantages were discussed. [ABSTRACT FROM AUTHOR]