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The Public Works Center for Coal-to-Natural Gas Production in Keqi, Datang, has successfully completed the replacement of the quartz sand filter media in Filter Unit 1 of the concentrated brine turbid circulation system. Author/Source: Datang Keqi Coal-to-Natural Gas Company. Date: April 16, 2022. Clicks: 12. Recently, the Public Works Center organized its staff to replace the quartz sand filter media in Filter Unit 1; due to prolonged operation, the original filter media had lost some of its quartz sand as a result of backwashing, which led to an increased frequency of backwashing, a decrease in the amount of water that could be processed per cycle, reduced capacity to remove impurities, and higher turbidity in the effluent. This situation increased water consumption, making it urgent to carry out this replacement. Due to the relatively high height and complex structure of the variable-porosity filter, and considering the limited operating space at the top of the tank during the initial filling phase, a pipeline system was adopted for material transfer. However, during operation, quartz sand accumulated in the pipelines, preventing effective transfer. The managers immediately changed the plan and opted for manual filling; everyone used shovels to pack the quartz sand into small bags, carried those bags to the pool one by one, and used homemade tools to level the quartz sand. Ultimately, completing this task took almost half as long as expected. For this filling operation, the center carried out thorough scientific planning and careful organization. Through 8 hours of relentless effort, its staff manually filled 60 tons of quartz sand filter media into the pores of Circulation 1# for concentrated brine treatment. The filling was completed to both quality and quantity standards, effectively increasing the amount of water that could be processed per cycle as well as the capacity to remove pollutants in the variable-pore filter system. This reduced the rate of water consumption, further promoting low-energy operation practices and helping the company improve its efficiency and productivity.