Composite multi-element coagulant for treating low-temperature low-turbidity water and preparation method of composite multi-element coagulant

Abstract

The invention discloses a composite multi-element coagulant for treating low-temperature low-turbidity water and a preparation method of the composite multi-element coagulant. The composite multi-element coagulant comprises the following components: aluminum sulfate powder, cross-linked polyacrylamide graft copolymer / silane modified nanocellulose, lime powder, fly ash and diatomite. The mass ratioof the aluminum sulfate powder to the cross-linked polyacrylamide graft copolymer / silane modified nanocellulose to the lime powder to the fly ash to the diatomite is 1: (0.05 to 0.20): (0.15 to 0.45): (0.15 to 0.25): (0.005 to 0.025); the cross-linked polyacrylamide graft copolymer / silane modified nanocellulose is prepared from the following components: a cross-linked polyacrylamide graft copolymer, silane modified nanofibers, aluminum chloride hexahydrate, N-(isobutoxymethyl) acrylamide and 2,2'-azobis[2-methylpropionamidine] dihydrochloride. The problems that the utilization rate of cross-linked polyacrylamide is reduced, the solvation effect of colloidal particles in low-temperature low-turbidity wastewater is enhanced, and destabilization is difficult are solved, and the neutralizingcapacity and adsorption bridging capacity of the coagulant can be improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a composite multi-component coagulant for treating low-temperature and low-turbidity water and a preparation method thereof. Background technique [0002] Low-temperature and low-turbidity water mainly refers to surface water with a temperature lower than 10°C and a turbidity lower than 30 NTU. In low-temperature and low-turbidity water, the impurities are mainly uniformly dispersed and dissolved in the water as fine colloids, and the colloidal particles have strong dynamic stability and coagulation stability. Due to the low turbidity of low-temperature and low-turbidity water, the number of colloidal particles contained in the water body is small, and the chances of colloidal particles colliding with each other and aggregating are less. Low temperature and low turbidity water Due to the low water temperature, the Zeta potential of the colloidal particles in the wat...

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Problems solved by technology

[0006] The object of the present invention is to provide a composite multi-component coagulant for treating low-temperature and low-turbidity water and its preparation method, so as to solve the problem of cross-linking polyacrylamide and metal cation hydroxide in the above-mentioned background technology. The utilization rate of joint polyacrylamide is reduced, the solvation of colloidal particles in low-temperature and low-turbidity wastewater is enhanced, the surface hydration film is easy to form, and the destabilization is difficult. It can increase the neutralization ability and adsorption bridging ability of the coagulant.