XU Xiao-ming.Design of Expansion Project of a WWTP with Industrial Wastewater as the Main Feed Water[J].China Water & Wastewater,2021,37(4 4):71-75.
Design of Expansion Project of a WWTP with Industrial Wastewater as the Main Feed Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
4 4
Page:
71-75
Column:
Date of publication:
2021-02-17
- Abstract:
- The influent of a wastewater treatment plant in Zhejiang Province contained 70% industrial wastewater with high concentration of organic matter and emulsified oil, as well as high impact load. However, the effluent should reach the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). AAO tank, high-efficiency sedimentation tank and cloth-media filter were used in the first-stage project(2×104 m3/d), which caused severe excess of effluent organic matter. Therefore, the regulating tank, coagulation/air floatation unit, A/O tank and high efficiency sedimentation tank were applied in the second-phase expansion project (2×104 m3/d). The design features were as follows: adjusting the quality and quantity of influent by adding a regulating tank; The coagulation/air floatation tank was used to remove the emulsified oil, so as to avoid the interference with the subsequent process operation; By extending the residence time of the biochemical tank, the removal of organic matter was strengthened, advanced oxidation process could be avoided in advanced treatment stage, which would save the costs of construction and operating. For air floatation sludge, centrifugal dewatering were selected, and belt filter dewatering were selected for the biochemical sludge. During the trial operation of the project, the effluent quality was stable and reached the design standard, and the direct operation cost was 0.56 yuan/m3.
Last Update:
2021-02-17