Silicon removing method for silicone waste water
A technology of wastewater and silica gel, applied in the field of water treatment, can solve the problem of difficulty in the treatment of silica gel wastewater, and achieve the effect of significant environmental benefits
Inactive Publication Date: 2013-09-11
ZHEJIANG MARINE DEV RES INST
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[0004] The purpose of the present invention is to provide a method for removing silicon from silica gel wastewater with reasonable sewage treatment process and better treatment effect, so as to solve the technical problem that the treatment of silica gel wastewater is difficult at present
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[0023] Such as figure 1 The silicon removal method of shown silica gel wastewater, the method steps are as follows:
[0024] 1. Mix and homogenize
[0025] Since the water quality of the waste water produced by each process of silica gel waste water is quite different, the waste water is mixed and homogenized first. The mixing and homogenization is carried out in the mixing tank, and the hydraulic retention time is about 2 hours.
[0026] 2. Water quality adjustment
[0027] The homogenized wastewater is acidic, adding slaked lime to the wastewater to adjust the pH of the wastewater to 7-8 is beneficial to improve the removal rate of silicon. Alkali addition is carried out in the regulating tank. After adding alkali, the wastewater will produce a large amount of flocculent suspended matter, which is removed by sedimentation. The hydraulic retention time is 4 hours.
[0028] The alkali to be added can also be quicklime, limestone, magnesium hydroxide, sodium hydroxide, pot...
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The invention belongs to the field of a water treatment technology, and in particular relates to a silicon removing method for silicone waste water. The method comprises the steps of mixing and homogenizing, water quality adjusting, and coagulation silicon removing. In the step of mixing and homogenizing, silicone waste water is subjected to mixing and homogenizing in a mixing tank, and a hydraulic retention time is 1 to 5 hours; in the step of water quality adjusting, an alkali is added to the silicone waste water, the pH value is adjusted to the range of 6 to 9, and a hydraulic retention time is 2 to 10 hours; in the step of coagulation silicon removing, calcium chloride and magnesium chloride are successively added tothe waste water obtained by the step of water quality adjusting, uniformly mixing is carried out, ferric chloride is added to the waste water to form alum blossom, finally polyacrylamide is added, slag and water are separated to obtain a clear supernatant. The step of coagulation silicon removing is carries out in a coagulation and sedimentation tank, and the hydraulic retention time of the waste water in the coagulation and sedimentation tank is more than 40 minutes. The silicon removal flocculant provided by the invention has high removal rate of total silicon in silicone waste water, and after being subjected to subsequent treatments, can realize reclaimed water reuse.
Description
technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for removing silicon from silica gel wastewater. Background technique [0002] The main raw material for the production of silica gel is sodium silicate (commonly known as water glass, sodium silicate), which is obtained by chemical processing of silica. That is, the melt produced by calcining quartz ore powder and soda ash at a high temperature of 1100-1350°C is soaked in water to obtain a colorless and transparent viscous liquid. The production methods of silica gel are: (1) sulfuric acid method, which is obtained by reacting sodium silicate and sulfuric acid (other acids can also be used); (2) double decomposition method, which is obtained by the action of sodium silicate and water-soluble salts; (3) ) Precipitation method, which is obtained by precipitating silica gel from alkali metal silicate solutions with the help of various organic compounds; (4) Electr...
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IPC IPC(8): C02F1/52C02F1/56C02F1/60
Inventor 范会生陆阿定张海春郁小芬王波孙保库孙兆栋
Owner ZHEJIANG MARINE DEV RES INST