RESEARCH OF THE POSITIVE AND NEGATIVE OF IONIC ORGANIC FLOCCULANT ON SLUDGE DEWATERING

To research the behavior of the ionic organic flocculant on sludge dewatering，under different conditons， the paper added the flocculant of poly diallyl dimethyl ammonium chloride ( HCA) and polyacrylamide ( APAM) to the sludge． The results showed that pH，flocculation time and the dosage of flocculant significantly affected the performance of sludge dewatering． The optimal reaction conditions of sludge dewatering was the flocculant dosage of 30 mg /L，the pH of 5，the vacuum filtration time of 4min． HCA and APAM could achieve better performance of sludge dewatering，but the behaviour of HCA was better than APAM． Besides，adsorption bridging was the main mechanism of flocculation reaction，charge neutralization played a supporting role．