Resourceful treatment method for silica gel waste water
A treatment method and recycling technology, applied in the field of comprehensive resource treatment of silica gel wastewater, can solve problems such as the difficulty of silica wastewater treatment, achieve significant environmental and social benefits, save freshwater resources, and achieve significant environmental benefits.
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Embodiment 1
[0025] like figure 1 The shown silica gel wastewater resource treatment method, the method comprises the following steps:
[0026] 1. Water quality adjustment
[0027] In the water quality adjustment tank, add lime to the silica gel waste water to adjust the pH to the range of 7-8.
[0028] 2. Coagulation and silicon removal
[0029] The pH-adjusted wastewater flows into the coagulation sedimentation tank, and 300 mg / L calcium chloride and 100 mg / L magnesium chloride are added to the wastewater, and mixed to remove dissolved silicon in the wastewater, and then 150 mg / L is added to the wastewater Ferric chloride solution, fully mixed to form alum flowers, and finally add 2 mg / L polyacrylamide to increase the size of the alum flowers and accelerate the settlement. The wastewater stays in the coagulation sedimentation tank for 45 minutes and is separated from the slag water to obtain Clearer supernatant.
[0030] The above-mentioned calcium chloride, magnesium chloride, ferri...
Embodiment 2
[0039] The specific method is the same as in Example 1, the difference is that the dosages of calcium chloride, magnesium chloride, ferric chloride, and polyacrylamide are respectively 200 mg / L, 50 mg / L, and 100 mg / L in terms of per liter of waste water , 1mg / L; the hydraulic retention of wastewater in the coagulation sedimentation tank is 60 minutes; in the ceramic membrane filtration, the ceramic membrane with a pore size of 0.2μm is selected, and the operating pressure is 0.2Mpa; the nanofiltration membrane is cellulose acetate with a molecular weight cut-off of 150 Membrane: The operating pressure of nanofiltration membrane filtration is 2.5MPa, and the operating temperature is 40°C.
[0040] The concentration ratio of the concentrated water obtained in this example was 3.4 times, and the sodium sulfate content was 9.68%. High-quality sodium sulfate solids were obtained after evaporation and drying; see Table 3 for the effluent quality of nanofiltration membrane.
[0041] ...
Embodiment 3
[0044] The specific method is the same as in Example 1, the difference is that the dosages of calcium chloride, magnesium chloride, ferric chloride and polyacrylamide are respectively 400 mg / L, 80 mg / L and 200 mg / L in terms of per liter of waste water , 5 mg / L; the hydraulic retention of wastewater in the coagulation sedimentation tank is 60 minutes; in the ceramic membrane filtration, the ceramic membrane with a pore size of 0.2 μm is selected, and the operating pressure is 0.2Mpa; the nanofiltration membrane is a composite nanofiltration with a molecular weight cut-off of 300 Membrane: The operating pressure of nanofiltration membrane filtration is 2.5MPa, and the operating temperature is 20°C.
[0045] The concentration ratio of the obtained concentrated water was 3.5 times, and the sodium sulfate content was 9.98%. High-quality sodium sulfate solids were obtained after evaporation and drying;
[0046] Table 4 The effluent quality of nanofiltration membrane filtration
[004...
PUM
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