| Water resources are important strategic resources related to China's economic lifeline and people's livelihood.With the rapid improvement of the national economic level in recent years,the demand for water resources is also increasing.Under the new situation,the problem of water pollution and the serious shortage of water resources have gradually become prominent.The coal-to-gas power plant is an enterprise with a large demand for water,not only industrial wastewater,but also the overall proportion of domestic sewage cannot be ignored.Therefore,the domestic sewage is treated as daily greening water and on-site chemical workshop as reclaimed water,saving water potential huge.In a coal-to-gas power plant in Tianjin,the waste water currently produced in production and life is mainly organic matter,heavy metal molecules,and the pH exceeds the standard.The waste water has been classified and processed to meet the car washing and sweeping water standards in CJ25.1-89 "Standards for Domestic Miscellaneous Water" The indicators are:BOD5?10mg/L;SS?5mg/L;CODcr? 50mg/L;NH3-N? 10mg/L.This topic is based on the characteristics of domestic sewage in a coal-to-gas power plant in Tianjin.Through multi-program economic and technical comparison,the MBR technology is successfully applied to wastewater treatment engineering practice.In accordance with the relevant national design codes and standards,the process design and operation debugging of domestic sewage advanced treatment for coal-to-gas power plant relocation project were completed.The commissioning results of operation practice show that after deep treatment of domestic sewage in this project,the BOD,concentration is reduced from the average value of inflow 164.2 mg/L to the average value of effluent 8.2mg/L.The removal effect is significant,and the removal rate reaches 95%;The average value of 313.2mg/L was reduced to the average effluent of 31.3mg/L,and the removal rate reached 89.1%;the SS concentration and NH3-N were reduced from the average of the influent of 223.6mg/L and 9.1mg/L to the average of effluent of 3.3mg/L And 4.0mg/L;at the same time,the entire set of treatment process also effectively removes the oil contained in domestic sewage to achieve the expected effect.After the commissioning program runs,the project is in a stable state,and the effluent quality meets the design standards.Through research and application of the MBR process for domestic sewage treatment,this topic has solved to a certain extent the difficulties faced by traditional power plant companies in the actual production and life of domestic sewage treatment.It is possible to reduce the treatment equipment account by choosing the optimal selection of traditional process equipment Floor area;At the same time,through the use of MBR technology,effectively improve the sewage treatment effect,so that the water quality meets the drainage reuse standard;improve the impact resistance and sewage treatment capacity,ensure the quality of the produced water,and obtain high-quality produced water.Relying on the coal-to-gas relocation project of a power plant in Tianjin,the practical application of the MBR process in the advanced treatment of domestic sewage in the power plant was realized,effectively improving the existing sewage treatment model and solving the problem of domestic sewage recycling.Here,this commissioning practice case will provide reference value for the treatment and operation of domestic sewage in the future power plant construction. |
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