Power plant desulfurization wastewater zero discharge project
Release time：
2025-12-01 13:44:01
During the two years of stable operation of the zero-discharge wastewater treatment project based on the all-membrane method, the zero-discharge water utilization rate has always exceeded 93%. At the same time, the resource recycling and recycling of water, salt, and mud was achieved, overcoming the development bottlenecks of zero-discharge technology at that time, such as low water utilization rate, inability to process high-yield mixed salt by-products, and the risk of secondary pollution. Taking the power plant zero-discharge project as an example, we analyze the power plant's zero desulfurization wastewater project from the aspects of macro processing technology, key technologies, operation and maintenance services, and economic benefits. We summarize the successful cases of power plant zero desulfurization wastewater project projects from the perspective of process economic development, and explore the feasible ways for the sustainable development of zero wastewater discharge technology in the future.
In my country's energy structure, coal will continue to be my country's important energy source in the long term, and coal-fired power generation's dominance in the energy supply layout will remain unchanged in the short term. Nearly 90% of the desulfurization systems used in raw coal power plants use dolomite-gypsum wet flue desulfurization technology. Because the wastewater produced by the desulfurization system is acidic, has a very high content of suspended solids and salts, and contains a large amount of heavy metals exceeding the standard, it is a problem and key in the audit of power plant wastewater. Due to the uniqueness, diversity and strong corrosiveness of desulfurization wastewater pollution components, whether this part of wastewater can be treated satisfactorily has become the key factor that hinders the realization of "zero discharge" of wastewater in coal-fired power plants. With the promulgation of a series of environmental protection laws and regulations such as the "Water Pollution Prevention and Control Action Plan" ("Water Ten Articles"), the "Implementation Plan for the Permit System for Control of Pollutant Discharge", and the "Technical Policy for the Prevention and Control of Pollution from Thermal Power Plants", raw coal power plants, as large water consumers, are subject to water source management and discharge restrictions. Pressure at a certain level has suddenly increased: the national environmental protection policy stipulates that the environmental assessment level of new power plants after 2005 shall be designed in accordance with the "zero discharge" regulations of power plant wastewater; at the same time, power plants in water source protection areas and areas rich in coal and low water such as the Great Northwest have also successively stipulated the implementation of zero discharge of wastewater. Our country's zero-emission technology has been in engineering practice since 2009. As of the power plant's Zero Discharge of Desulfurization Wastewater construction project in 2015, there were relatively few domestic zero-emission project construction processes, including Heyuan City Power Plant in Guangdong Province and Jingneng Nanxun Power Plant. However, the overall level is still in the technical development and practice stages, and zero-emission system software design and operation experience are imperfect. China's two major power plant zero-emission projects that have been put into operation both have problems with high investment and operation costs. Moreover, the water utilization rate is low, the output of mixed salt by-products cannot be processed, and there is a risk of secondary pollution. Various problems restrict the rapid development and application of zero-discharge technology. Therefore, completing the recycling of raw coal power plant wastewater and miscellaneous salts at the same time is the key development bottleneck of zero-discharge power plant wastewater technology.
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