CHEN Li-zhu,CHAO Meng,HE Sun-wei.Biosafety Risk and Influencing Factors of Daphnia Zooplankton in Waterworks[J].China Water & Wastewater,2022,38(2022 1 1):60-63.
Biosafety Risk and Influencing Factors of Daphnia Zooplankton in Waterworks
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
60-63
Column:
Date of publication:
2022-01-01
- Keywords:
- waterworks; daphnia zooplankton; ultrasonic; pre?oxidation
- Abstract:
- To deal with sensory problems and potential biosafety risks caused by daphnia zooplankton in waterworks, the microorganism and organic matter content released from dead daphnia zooplankton in effluent of sedimentation tank, the effects of ultrasonic time and ultrasonic frequency on daphnia zooplankton, and the control of daphnia zooplankton by pre-oxidation and sludge discharge cycle were investigated. Bacteria carried by daphnia zooplankton in the effluent from the sedimentation tank of the waterworks were released after ultrasonic breakage, which increased the total number of bacteria in the water. The leachate from the dead daphnia zooplankton bodies led to an increase in the concentration of organic matter in the water sample. Ultrasonic treatment significantly reduced the activity of daphnia zooplankton, and the activity of daphnia zooplankton decreased with increasing ultrasonic time. At the same ultrasonic time, the activity of daphnia zooplankton decreased with the increase of the ultrasonic frequency. Both the pre-oxidation and shortening the sludge discharge cycle could effectively control the growth of daphnia zooplankton in summer and winter, and the removal efficiency of daphnia zooplankton increased with the increase of the pre-oxidant dosage. When the pre-oxidant dosage reached 1.5 mg/L, the removal efficiency tended to be stable at approximately 92%.
Last Update:
2022-01-01