Problem diagnosis and analysis of advanced treatment system for reclaimed water in a power plant

Abstract

The reclaimed water of municipal sewage plant after advanced treatment in a power plant is used as makeup of circulating water system. Due to the problems in the advanced treatment system of reclaimed water，such as the output of the mechanical acceleration clarification tank failing to reach the designed value，poor effluent quality，the sludge dewatering system failing to operate normally，the feeding blockage of the lime system，the widespread leakage of the dosing device and no chain control，etc.，the requirements for normal use of reclaimed water in the power plant can’t be met. After the diagnosis of the problems，the optimization scheme was put forward. The internal structure of the mechanical acceleration clarification tank and the bottom sludge discharge pipeline system were modified respectively to restore the processing capacity of the mechanical acceleration clarification tank and meet the requirements of the water required of the system. The sludge dewatering system was modified to restore the sludge dewatering unit. The lime dosing system was modified to improve the problems of lime dosing and material blockage then restored the stable operation of the lime system. After optimization and transformation，the output of the clarification tank was improved，and the effluent quality of the system was optimized，effectively ensuring the normal operation of the deep treatment system for recycled water and the safety of water use in the power plant.

Keywords

• advanced treatment system for reclaimed water
• mechanical accelerated clarification tank
• sludge dewatering
• lime dosing