| Human life and production activities are inseparable from water.With the in-creasing of human consumption of water resource and serious water pollution, water shortage has become an increasingly restricting human economic development, a se-rious threat to human survival. Because the city water source of stability and reliabili-ty, water reuse has become a important way to alleviate the shortage of water re-sources. In thermal power plant water consumption, the circulating cooling water ac-counts for more than 90% of the total water consumption, thermal power plant in-stalled capacity of 1000MW, the amount of daily replenishment of circulating cooling water to reach 3800 m3, consumption is very great. Therefore, the reclaimed water reused as circulating cooling water for power plant can effectively protect the pre-cious water resources, recycle the wastewater, increase water use value, is conducive to the harmonious development of human and ecological environment. As the water contains high alkalinity, hardness, organic matters, such as salt, scale and corrosion will happen or develop biological phenomenon such as sticky mud, hinder the im-provement of circulating cooling water concentration ratio, endanger safe operation of the unit, therefore, the water must be through deep processing, to remove these harm-ful ingredients to recycle.In this paper, in accordance with the requirements of a thermal power plant project in shenyang construction, from near secondary wastewater deep treatment of wastewater treatment plant, and then as make-up water of power plant circulating wa-ter cooling water system. Ash coagulation process debugging experiment was carried out respectively and ceramic membrane process test to observe the treatment effect and cost analysis, and get the most suitable for the thermal power plant water depth of processing the best test.Through the scene debugging flocculant, coagulant aid reagent adding quantity test such as lime coagulation method depth of water in the optimal dosage, and on the depth of water in the process used for the benefit of power plant circulating water for analysis. Treated with lime coagulation debugging test, the water quality have im- proved but the water hardness are not reach the requirement of the thermal power plant circulating water cooling. Through cost analysis, medicament adding to halve the processing cost is 0.76 yuan/ m3, don’t add medicament processing cost is 0.51 yuan/ m3. Don’t add medicament treatment effect is better and cheaper.Ceramic membrane process with biological filter treatment of power plant the aerated water as experimental samples. Water samples respectively by 50nm, 100nm, 200nm ceramic membrane, by adjusting the frequency, pressure regulating valve and the flow regulating valve to adjust the water production rate were 40%, 50%, 60%, 70%, 80%, 90%, detection of influent and ceramic membrane filtration in 5min,10 min, 20 min, 30 min and 60 min when the quality of the produced water. According to the test can get three kinds of aperture ceramic membranes with different water pro-duction rate when the effluent reached water recirculating cooling water requirements. Ceramic membrane aperture for water production rate of 200nm, 70% ceramic mem-brane flux was highest, at this time, the production cost is 0.54 yuan/m3.In summary, coagulation and ceramic membrane treatment process for advanced treatment of reclaimed water compared with lime, ceramic membrane process and low operation cost, good water quality, can guarantee the circulating cooling water system of power plant is stable, safe operation completely. Water system of unit cost 0.54 yuan/t, economic benefit is very considerable. |
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