Thesis Details


Thesis Title: Evaluation of the hydraulic retention time necessary to biodegrade a complex dyeing and finishing waste
Thesis Author: Heather Green
Abstract: As textile manufacturing production has increased and chemical usage has changed over the years, some of the same textile waste treatment plants built 20 to 30 years ago are still being used today. If the operation of the plant with respect to design parameters has not changed accordingly, efficiency losses may be extensive. This forces volume requirements up and plants are faced with construction of additional capacity. However, if the design parameters were re-evaluated, the system volume requirements could possibly be reduced simply by manipulating other design parameters (e.g., HRT, biomass concentration). Previous research suggests that aerobic activated sludge treatment systems with retention times less than 24 hours are capable of reducing the chemical oxygen demanding substances, also referred to as the COD, present in textile wastes to a satisfactory level. Since the plant treatment systems are operated on a continuous basis, the majority of the research has been conducted on a continuous basis. The sludge age does not vary significantly in the steady state operation of the continuous flow systems. As the sludge age varies, so do the COD removal and retention time required. In this study, sludge age and retention time were varied to determine their effect on COD removal for a batch reaction system. Findings indicated that hydraulic retention times of less than 48 hours may be feasible, if toxicity is not an issue in the plant.