Polymer-assisted hydraulic dredging for quality control of stormwater pond sediment and reject water – Influence of polymer choice and its preparation

Hydraulic dredging of stormwater ponds may include on-site dewatering dredged materials using polymers and geotextile filtration. The choice polymer its preparation affect the overall operational effectiveness quality reject water (filtrate) returned to pond. This study examined resulting particle content as well nutrient metal concentrations in filtrate conducted on hydraulically sediment that was chemically conditioned filtered through geotextile. investigates how affects outcome. In total, three types were tested (powder, emulsion commercial cationic chitosan), (tap or reclaimed) prepared in, aging time solution. Deviations from manufacturer's instructions increased amount needed for an optimal conditioning process. terms pollutant retention, there no difference between preparations. filter cake discernable unconditioned sediment, rather noticeable filtrate. Conditioned produced a with considerably less than sediment.