Waterview Mobile Home Park

SOLUTION

The revised approach centred on the addition of a membrane bioreactor (MBR) as the final biological treatment and solids separation step. This allowed the existing secondary
clarifers to be converted to post-anoxic reactors complemented by external carbon
feed for enhanced denitrifcation. With the MBR located downstream of the expanded postanoxic reactors, excess carbon can be added to ensure denitrifcation without concern for high effuent BOD and TSS. The MBR effuent refects very low BOD, TSS, and turbidity and thus can be disinfected with UV light.

The existing Primary Clarifer was converted into an aerobic sludge digester.

The second Primary Clarifer chamber continues to provide primary solids separation and incorporates a Trash Tank to provide grit removal, primary solids and trash removal as
well as hair, string, and rag control. An aerated wedge wire screen with 0.1” (2.5mm) openings and a grinder pump that allows the operator to manually pump down the Trash Tank and discharge primary solids to the adjoining new Sludge Digester.

The MBBR carriers were removed from the Pre-Anoxic chamber to improve mixing and
eliminate issues with carriers blocking the screens. The nitrifcation MBBR carriers remain, but the Post-Anoxic zone was emptied of carriers to again improve mixing.

Newterra then supplied a new MBR system in a 20-foot High Cube cargo container, constructed with insulated walls, heating and ventilation. This modular system was complete with new aeration blowers, membrane feed pumps, dual stainless steel membrane tanks, MicroClear MB3-1 membranes, permeate extraction, CIP system and controls. The old UV system was taken out and new UV units supplied with the Newterra package.

The system was ordered in March of 2018, and delivered in June 2018. Start-up was completed in July.