To utilize plentiful starch resources in our country and meet higher requests of flocculant in the modern wastewater processing, the formation mechanisms of complexes between phosphate ester starch and polyamine(PESPC) were studied, and the functions of the complexes as flocculant in the treatment of de-ink wastewater were investigated. In chapter 2, we studied the preparations of phosphate ester starch and PESPC. The effects of dosages and mass ratios of the phosphates, reaction time and amounts of urea to...