Preparation method and application of novel adsorptive iron salt compound flocculant

Abstract

The invention provides a preparation method and an application of a novel adsorptive iron salt compound flocculant. The method comprises the following steps: (1) mixing activated carbon powder and poly-ferric sulfate powder at a mass ratio of (1-0.3):1; (2) adding into a stirrer, grinding, and mixing to obtain mixed powder; and (3) compounding the mixed powder and polyacrylamide at a mass ratio of 99:1, grinding, and mixing to obtain the novel adsorptive iron salt compound flocculant. The novel flocculant of the invention is prepared from poly-ferric sulfate flocculant, activated carbon and polyacrylamide as the raw materials, in which the poly-ferric sulfate flocculant can remove the dispersed impurities and macromolecular organic matters in water (which cannot be well adsorbed by powdered activated carbon), and the powdered activated carbon can remove micromolecular organic matters that are hardly removed by coagulation, so that the treatment capacities for removing organic matters of the poly-ferric sulfate flocculant and the powdered activated carbon are both further improved.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a preparation method and application of a novel adsorptive iron salt composite flocculant. Background technique [0002] The coking industry is one of the key polluting industries in my country. Coking wastewater has always been the focus and difficulty of wastewater treatment process research because of its large discharge volume, complex composition, high treatment difficulty, and refractory organic wastewater. At the same time, the shortage of water resources has become a limiting factor restricting the further development of my country's coking, coal chemical industry and other industries. In order to realize the sustainable development of the coking industry, the treatment standard and advanced treatment of coking wastewater become the key to achieve this goal. [0003] The existing treatment methods of coking wastewater can be divided into: (1...

AI Technical Summary

Problems solved by technology

However, for coking wastewater that is difficult to treat, such as when the effluent COD index of the secondary sedimentation tank is as high as 300-400mg / L, the COD effluent index of the coagulation tank is 210-280mg / L when the pure iron salt flocculant is used, which is controllable for coking wastewater The indicator is that COD is less than 150mg / L, so the effluent indicator exceeds the standard; in addition, if the turbidity of the effluent from the secondary sedimentation tank is low, the alum flowers are relatively small after flocculation with pure iron salt, the amount of flocs is small, the settlement effect is poor, and the treatment effect is general, so Exceeding water index

Therefore, in view of the above situation, the pure iron salt flocculant is unable to meet the needs.