Experimental method for preparation of poly-iron-based flocculating agent for coking wastewater advanced treatment

Abstract

The invention relates to an experimental method for the preparation of a poly-iron-based flocculating agent for coking wastewater advanced treatment. The experimental method comprises the specific operating steps that 1, the optimal preparation conditions of polymeric ferric sulfate are determined through an orthogonal experiment method; 2, on the basis of the optimal conditions of the polymeric ferric sulfate, an aluminum ingredient is added, and the optimal molar ratio of Fe to Al is determined through a coagulation experiment; 3, on the basis of polymeric ferric aluminum sulfate, activated silicic acid and positive polyacrylamide ingredients are added, and the optimal iron-aluminum proportion is determined through a coagulation experiment; 4, polysilicate ferro-alumium sulfate is applied to the coking wastewater advanced treatment, and the optimal technological conditions of the flocculating agent are determined. According to the experimental method for the preparation of the poly-iron-based flocculating agent for coking wastewater advanced treatment, under the conditions that the pH value of the flocculating agent is 7 and the dosing quantity is 0.83 mL / L, the CODcr removing rate of a coking wastewater sample can reach 50%, the turbidity removing rate reaches 95.96%, the chroma removing rate reaches 50%, through the research and development of the optimal flocculating agent matching, the efficiency of coking wastewater coagulation treatment is improved, and the load of follow-up treatment units is reduced.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a polyiron-based polymer coagulant for advanced treatment of coking wastewater. Background technique [0002] According to the main mechanism of action of water treatment agents in sewage treatment, a wide variety of flocculants have been developed at home and abroad. According to its composition, it can be divided into three categories: inorganic flocculants, organic flocculants and microbial flocculants. Inorganic low-molecular-weight flocculants are the earliest flocculants used. They have been widely used in the purification of drinking water and industrial water, as well as in the dehydration of groundwater, wastewater, and sludge. Molecular flocculants instead. As a new type of water treatment agent, inorganic polymer flocculants were developed on the basis of traditional aluminum salts and iron salts in the 1960s. It not only has the characteristics of low-molecular flocc...

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Problems solved by technology

[0003] The flocs formed by aluminum salt flocculants in the flocculation process are large and have good decolorization effect, but the flocs are loose and fragile, and the sedimentation speed is slow; the flocs formed by iron salt flocculants in the flocculation process are dense, and the sedimentation speed is fast, but The flocs are small, the sweeping effect is poor, and the color of the treated water is darker

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