Experimental Study On Removal Effect Of Sulfate Radical And Hardness In Mine Wastewater

Shanxi is my country important production base of coal industry, coal production accounts for more than a quarter of the national coal output. As more small coal mines in Shanxi Province, coal mining emission of a large number of direct discharge of untreated mine water, causing pollution to the surrounding environment, to maintain water quality greatly reduced, resulting in water quantity or quality of water, water damage very serious. To address the low utilization of mine water in Shanxi Province, a waste of serious problems, this study seeks to experiment in the last two students on the basis of some progress, to find a more suitable approach in Shanxi mine water to mine water from flocculation, sedimentation, after the combination of technology can reduce wastewater sulfate content and total hardness content of the effluent quality meet the national drinking water standard of living.By changing the fly ash, diatomaceous earth, activated carbon dosage size, at different temperatures and pH values, different coagulant dosage tested good, preferred adsorbent to determine the selected fly ash. Fly Ash and several coagulant (aluminum chloride, ferric chloride, aluminum chloride, ferric chloride), coagulant PAM, at different values of temperature and PH conditions tested, through the estimated to cost the economy and ultimately determine the PAC, PAM, fly ash mixed with the pharmaceutical dosage. The temperature of 22℃, pH = 7, join the PAC 0.3g / L, flocculant PAM 4mg / L, ash 4g / L, the best place to go, sulfate removal rate was 89.94%, removal rate was 87.81 percent of total hardness.Dynamic filtering column test is based on a static beaker tests, with the optimal combination of investment and added to the pharmaceutical coagulation in the pool, after coagulation of the mine water after filtration through the filtration column, the effluent quality further. Device after a long period of operation, obtain the optimum operating parameters, coagulation HRT 7h, the filtration cycle is 46h, ore processing backwash time 20min, backwashing strength 16.27L / s ? m2, filter layer filter backwash best.Run filtration column test device can be: When SO42-≤1100mg / L, total hardness≤1200mg / L, consider the treated effluent quality and electrodialysis, reverse osmosis desalination process two membrane treatment method comparison, treated effluent quality can be meet the national drinking water standard of living, but take into consideration economic factors, this case is to use the test device used in filtration column.When SO42-> 1100mg / L, total hardness> 1200mg / L, run the filter column test, even when the increase in the coagulation of pharmaceutical dosage, the treated effluent quality fails to meet drinking water standards of living. Electrodialysis, reverse osmosis membrane treatment of this water quality of two mine water, treated effluent quality can meet the national drinking water standard of living, but both methods require a large capital, high operating costs, better suited to deal with highly mineralized mine water relatively more affordable.