Pretreatment method for secondary effluent treated by nanofiltration/reverse osmosis technology
A technology of secondary effluent and technical treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of increasing operating costs, shortening the service life of membranes, pollution, etc. To achieve the effect of reducing mutual interference and improving removal efficiency
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Embodiment 1
[0033]In conjunction with the accompanying drawings, in view of the complex water quality of the secondary biological effluent in this embodiment, including inorganic ions, suspended matter, microorganisms, colloids, and dissolved organic matter, if nanofiltration / reverse osmosis treatment is directly performed, colloids will form on the nanofiltration / reverse osmosis membrane , Inorganic salt scaling, deposition of microorganisms and organic pollutants. Although the addition of scale inhibitors can prevent calcium, barium and other sulphates and carbonates from depositing on the surface of nanofiltration / reverse osmosis membranes, there are also membrane fouling by scale inhibitors and the resulting high-concentration phosphorus-containing wastewater is difficult to treat. Commonly used pretreatment processes such as "coagulation-clarification-multimedia filtration", "microfiltration / ultrafiltration filtration" have certain effects on the control of colloidal and microbial con...
Embodiment 2
[0044] The pretreatment method of nanofiltration / reverse osmosis technology in this embodiment to treat the secondary effluent is basically the same as that in Embodiment 1, the difference is that in this embodiment, the mixed ion exchange resin is a macroporous strong base with a volume ratio of 5:1. Type acrylic anion exchange resin D213 and macroporous weak acid type acrylic cation exchange resin D113, the two resins are uniformly mixed, and the particle size is between 0.8-1.25mm, the flow rate of the secondary outlet water is 2BV / h, the added Inorganic flocculant—the concentration of polyferric chloride in the effluent is 10mg / L. In the ultrafiltration treatment, the polyethersulfone membrane with a cut molecular weight of 50kDa is used for the ultrafiltration membrane, and the NaCl solution with a mass percentage concentration of 10% is selected as the desorption solution. . The DOC of the effluent is 6.2mg / L, and the SDI value is 0.51.
Embodiment 3
[0046] The pretreatment method of the nanofiltration / reverse osmosis technology in this embodiment to treat the secondary effluent is basically the same as in Embodiment 1, the difference is that in this embodiment, the mixed ion exchange resin is selected as a macroporous strong base with a volume ratio of 3:1 Type acrylic type anion exchange resin D213 and macroporous strong acid type styrene type cation exchange resin D001, the two resins are evenly mixed, and the particle size is between 0.6-1.1mm, the flow rate of the secondary outlet water is 15BV / h, adding The inorganic flocculant—polymeric ferric chloride has a concentration of 20mg / L in the effluent water. In the ultrafiltration treatment, the ultrafiltration membrane uses a polyethersulfone membrane with a cut molecular weight of 80kDa, and the desorption solution uses NaCl with a mass percentage concentration of 25%. solution, the effluent DOC is 7.1mg / L, and the SDI value is 0.63.
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Abstract
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