Abstract

This study aimed to evaluate several potential candidates of single disinfection/disinfectant units and integrated disinfection systems in treating sewage effluent to obtain non-potable water, within a techno-economic analysis framework. Eight candidates of commercially available disinfection units and integrated disinfection systems were selected to be examined under the techno-economic analysis by comparison amongst the sewerage effluent. There were 4 types of treatment processes represented amongst the single disinfection units (Single): ultraviolet (UV), chlorination, microfiltration (MF), and ultrafiltration (UF). Within these processes, MF and UF both were represented twice by HVLP00010 and PVDF021 M (MF membranes); and by PVDF1001 M and PES20kDa (UF membranes). Whereas, for integrated disinfection systems (Integrated), UV disinfection and chlorination act as the primary disinfection unit, with MF/UF, Enviromulti-media (EMM) adsorption, or granular activated carbon (GAC) adsorption integrated as the pre-treatment unit. Two design capacities for water recovery - 100 m³/day (to represent a pilot-scale reproduction) and 5000 m3/day (to represent an industrial-scale reproduction) were defined to analyze and compare the cost effectiveness between single disinfection units and integrated disinfection systems chosen in this study. Amongst the studied setups, single chlorination unit and EMM-UV integrated disinfection system were the two most economical configurations to regenerate treated water for restricted applications. Whereas, the single PVDF1001 M UF membrane filtration unit was ultimately suggested as the most economic and viable technology for unrestricted water reuse purpose at both design capacities, considering the estimated cost at Malaysia currency, RM 0.50/m³ and RM 0.10/m³ for 100 m³/day and 5000 m³/day design capacity, respectively.

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