Alkaline high-calcium wastewater decalcification treatment method

A treatment method and waste water technology, applied in water/sewage multi-stage treatment, neutralized water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of limited application range and high treatment cost, and reduce salt content , waste water treatment cost reduction, water quality improvement effect

Inactive Publication Date: 2011-04-06
XIANGTAN UNIV
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  • Alkaline high-calcium wastewater decalcification treatment method
  • Alkaline high-calcium wastewater decalcification treatment method

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[0021] The technological process of the inventive method is referred to accompanying drawing. Alkaline high-calcium wastewater 1 (pH 11.0-12.3, Ca concentration 679-1642 mg / L) generated from acid wastewater treatment enters the first neutralization tank A, and is treated with carbon dioxide waste gas 2 (CO 2 Concentration of 30% to 90%) aeration for pre-neutralization treatment, the pH is controlled at 9.0 to 10.0, and the aeration time is 5 to 40 minutes, so that the Ca(OH) in the wastewater 2 CaCO 3 Precipitate and drive the supersaturated CaSO in the wastewater 4 Co-precipitation; the pre-neutralized suspended wastewater enters the first sedimentation tank B, and the sedimentation time is 30 to 90 minutes; the supernatant wastewater of the first sedimentation tank B enters the reaction tank C, and sodium carbonate 3 is added under mechanical stirring. The addition of sodium carbonate 3 is controlled so that the mol ratio of sodium carbonate 3 and calcium in the waste wate...

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Abstract

The invention discloses an alkaline high-calcium wastewater decalcification treatment method, which comprises the following steps of: 1, introducing alkaline high-calcium wastewater into a first neutralizing tank, and performing preneutralization treatment through aeration by using a proper amount of carbon dioxide exhaust; 2, introducing turbid wastewater subjected to the preneutralization treatment into a first sedimentation tank for sediment separation; 3, introducing supernatant wastewater in the first sedimentation tank into a reaction tank, and adding a proper amount of sodium carbonate; 4, introducing the turbid wastewater subjected to the sodium carbonate treatment into a second sedimentation tank for sediment separation; 5, introducing the supernatant wastewater in the second sedimentation tank into a second neutralizing tank, and neutralizing through aeration by using a proper amount of carbon dioxide exhaust; and 6, introducing the supernatant wastewater in the second sedimentation tank into a filtering tank for filtering. The alkaline high-calcium wastewater decalcification treatment method is suitable for treating the alkaline high-calcium wastewater with the pH value of more than or equal to 11.0 and the calcium concentration of more than or equal to 500mg/L, the treatment cost is lower than that of a traditional method, and the water quality is improved.

Description

technical field [0001] The invention belongs to an alkaline wastewater treatment method, in particular to a decalcification treatment method for alkaline high-calcium wastewater produced by treating acidic wastewater with lime or carbide slag. Background technique [0002] Large-scale acid wastewater treatment is generally neutralized by lime or calcium carbide slag. The effluent is alkaline and the calcium concentration reaches about 1000mg / L. The discharge needs to be neutralized by acid, and the reuse needs to be decalcified. The traditional decalcification treatment method is to use sulfuric acid as neutralizing agent and sodium carbonate as decalcifying agent. Based on the calcium content in the wastewater, even if sodium carbonate is added at a molar ratio of 1:1, the decalcification effect of the wastewater is still limited. The calcium concentration in the effluent is mostly between 50 and 100 mg / L, and the total salt content is basically not reduced. More important...

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Application Information

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IPC IPC(8): C02F9/04C02F1/66
Inventor 游志敏李皓张杰黄力群
Owner XIANGTAN UNIV
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