Cross-linked cationic polyacrylamide sludge dewatering agent and preparation method thereof

Abstract

The invention relates to a cross-linked cationic polyacrylamide sludge dewatering agent which comprises the following components: deionized water, acrylamide, acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, ammonium sulfate, adipic acid, an active auxiliary agent, a chelating agent, an azo initiator, a cross-linking agent, a chain transfer agent, anoxidizing agent and a reducing agent. The preparation method comprises the following steps: mixing and stirring deionized water, acrylamide, acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, N-2, 2-propenyl-2-acrylamide, ammonium sulfate, adipic acid, the active auxiliary agent and other auxiliary cross-linking agents, and adjusting the pH value of thesolution; cooling, introducing nitrogen and discharging oxygen, adding the azo initiator, the chelating agent, the chain transfer agent, the oxidizing agent and the reducing agent, and closing a nitrogen introducing valve after reaction initiation to obtain flocculant colloid; crushing the colloid, drying at high temperature, and sieving to obtain flocculant powder; the dewatering agent is safe and environment-friendly, and can effectively improve the sewage dehydrating effect.

Description

technical field [0001] The invention belongs to the technical field of flocculant preparation, in particular to a cross-linked cationic polyacrylamide sludge dewatering agent and a preparation method thereof. Background technique [0002] Sludge is a by-product produced in the process of sewage treatment. It contains a large number of pathogenic bacteria, heavy metals and refractory organic matter. It has the characteristics of small sludge particles, poor sedimentation performance, and high moisture content. If it is not handled properly, it will cause serious secondary pollution to water sources and the atmosphere, and cause long-term and irreparable damage to the environment. According to research by some institutions, it is estimated that by 2020, my country's sludge production will reach about 65 million tons. According to the requirements in the "Notice on Strengthening the Prevention and Control of Sludge Pollution in Urban Sewage Treatment Plants", if the sewage tre...

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Problems solved by technology

Patent CN101172748A discloses a composite sludge dewatering agent, which can only control the dehydration rate at about 72% after compounding with other patented products, and the process is cumbersome; the sludge dewatering agent disclosed in patent CN101100345A uses There are up to 5 kinds of ionic dispersants, and the filtrate will cause secondary pollution

In addition, although the document "Graft Copolymerization and Flocculation Performance Test of Acrylamide and D-Fructose-Acrylamide Derivatives" mentions that cross-linking agents such as MBA can be used, but the grafting rate is very low during grafting, and it is difficult to achieve ideal application effect

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