Pukalani Wastewater Treatment Plant, Hawaii Water Service Company, Maui, HI Water Works Engineers designed an upgrade to the Pukalani WWTP . The existing plant, which used an extended-aeration activated sludge process, was replaced by a new 0.2 mgd membrane bioreactor (MBR) plant. The upgrade to the MBR treatment process allows the Pukalani facility to produce an e?uent with an improved water quality (R-1) over the previously produced R-2 e?uent. The MBR facility was designed for an initial phase of 0.2 mgd, average day ?ow and is expandable to 0.8 mgd. The structures constructed under the initial phase were sized for 0.4 mgd and the expansion from 0.2 mgd will only require the addition of membrane units and minor equipment. The new process units added included ?ne in?uent screens, an equa

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