Journal
CHEMOSPHERE
Volume 300, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134489
Keywords
Decentralised wastewater treatment; Source separation of urine; Nitrogen removal; Wastewater treatment capacity; Capital costs
Categories
Funding
- Bhutan Trust Fund for Environmental Conservation (BTFEC) [MB0167Y16]
- UTS International Research Scholarship (UTS IRS) , UTS cross-faculty collaboration fund
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This study simulated the impact of urine diversion on a decentralised wastewater treatment plant by using BioWin. The simulation showed that urine diversion can double the treatment capacity of the plant and reduce capital costs. When urine diversion exceeds a certain ratio, the existing treatment process can be replaced by a simpler membrane bioreactor.
In this study, the impact of urine diversion on the treatment capacity, treatment process, and capital costs of a decentralised wastewater treatment plant (WWTP) was simulated using BioWin. The data for simulation including for economic analysis were obtained from a real decentralised WWTP at Sydney. Simulation was conducted for two alternative process design scenarios of a WWTP: membrane bioreactor (MBR) without denitrification and anaerobic MBR in place of aerobic MBR and compared to existing process design. The simulation shows that with about 75% urine diversion (through source separation), the treatment capacity of the existing WWTP can be doubled although above 40% urine diversion, the impact appears less rapid. When the urine diversion exceeds 75%, it was found that the anoxic tank for biological denitrification becomes redundant and the current wastewater treatment process could be replaced with a simpler and much less aeration intensive membrane bioreactor (MBR) producing similar effluent quality with a 24% reduction in capital expenditure (footprint) cost. Anaerobic MBR can be a potential alternative to aerobic MBR although pre-treatment becomes essential before reverse osmosis treatment for water reuse applications. Sensitivity analysis has revealed that by operating the bioreactor at higher mixed liquor suspended solids concentrations (9 g/L instead of 5 g/L) could
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