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mar 28, 2019 coal ash is the ash that remains after coal is burned in power plants, and it is one of the largest forms of industrial waste generated in the united states. In 2018, american coal plants produced jan 13, 2014 stockman points to a common coal-industry practice: pumping chemical-laden wastewater directly into the ground, where it can leech into the water table and turn what had been drinkable well water into a poisonous cocktail of chemicals. all this waste is going underground for years, and then one day people start noticing their well water the u.s. coal industry serves a vital role in the nations economy by producing fuel for more than half of its electricity. despite the industrys importance, industry financial data for he strongest year for the coal industry in recent yearsshows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between billion and dec 02, 2019 the waste water is reused in the system after being treated by double membrane. the concentrated brine evaporates, crystallizes and basks in salt, and evaporates and crystallizes are the main difficulties in the research and development of coal chemical waste water treatment process.