Zero discharge treatment method for saline wastewater
A technology of saline wastewater and its treatment method, which is applied in the zero discharge treatment of high saline wastewater in the coal chemical industry and in the field of zero discharge treatment of saline wastewater, which can solve problems such as high cost, inability to achieve zero discharge, and ineffective integration of functions. Achieve the effects of low cost, long operation cycle and improved recovery rate
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Embodiment 1
[0051] The average concentration of each pollutant in a high-salt industrial wastewater is: COD is 70 mg / L, total hardness (calculated as CaCO 3 Calculated) is 800 mg / L, total alkalinity (as CaCO 3 (calculated) is 300 mg / L, silicon dioxide is 30 mg / L, and TDS is 4500 mg / L, among which, the concentration of nitrate ion is 60 mg / L, the concentration of chloride ion is 680 mg / L, and the concentration of sulfate ion is 1100 mg / L, the pH value is 7.5. Such as figure 1 As shown, using the zero-discharge treatment process for coal chemical industry saline wastewater includes the following steps:
[0052] (1) The salty wastewater enters the high-density clarifier. According to the water quality of the saline wastewater, calcium hydroxide is added at 1.5 g / L in the reaction zone of the high-density clarifier to maintain the pH value at 10.5-11.0, and then add 2.2 g / L sodium carbonate, then add 50mg / L PFS for coagulation and 4 mg / L PAM to aid coagulation. After fully coagulating in ...
Embodiment 2
[0061] The average concentration of each pollutant in a high-salt industrial wastewater is: COD is 68 mg / L, total hardness (calculated as CaCO 3 Calculated) is 1000 mg / L, total alkalinity (as CaCO 3 (calculated) is 500 mg / L, silicon dioxide is 30 mg / L, and TDS is 5000 mg / L, among which, the concentration of nitrate ion is 70 mg / L, the concentration of chloride ion is 700 mg / L, and the concentration of sulfate ion is 1000 mg / L. mg / L, the pH value is 7.8.
[0062] Such as figure 1 As shown, using the zero-discharge treatment process for coal chemical industry saline wastewater includes the following steps:
[0063] (1) The saline wastewater enters the high-density clarifier. According to the water quality of the saline wastewater, 1.8 g / L sodium hydroxide is added to the reaction zone of the high-density clarifier to maintain the pH value at 11.0-11.5, and then add 2.0 g / L sodium carbonate, then add 100mg / L PFS for coagulation and 10 mg / L PAM to aid coagulation. After fully ...
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