Study on Preparation and Effect of Flocculant Based on Crop Straw
In order to develop a novel natural polymer flocculant based on crop straw,cellulose was extracted from 3 crop straws of corn,rice and wheat by nitric acid-ethanol method,and copolymerized with methacryloxyethyltrimethyl ammonium chloride(DMC)in homogeneous aqueous solution(reaction temperature of 30,40,50 and 60 ℃)to generate straw cellulose grafted methacryloxyethyltrimethyl ammonium chloride flocculant(SC-g-DMC).The results showed that the best cellulose content of the 3 crops after straw extraction was(69.8%±1.7%),and the best grafting rate of the samples was(36.9%±3.1%).Infrared spectroscopy and scanning electron microscopy(SEM)confirmed the successful grafting of monomers to the cellulose surface of straw.The flocculation effect of SC-g-DMC on dairy farm sewage showed that under different reaction temperatures,the pollutant removal efficiency first increased and then decreased with the rise of reaction temperature.The SC-g-DMC prepared at 40℃ had the best flocculation effect.The removal rate of chemical oxygen demand,turbidity and total suspended solids of 100 mg·L-1 SC-g-DMC on dairy wastewater was(13.9%±2.3%),(30.6%±5.6%)and(33.8%±0.9%),respectively.Above results showed that the flocculant had a good application prospect and could provide basic data for the application of new natural polymer flocculants.
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