Greenlea Meats New Wastewater Treatment Plant

The anaerobic lagoon was lined with 1.5mm thick PE liner and a PE cover fitted with a gas collection and release system. The SBR lagoon was lined with a PE liner and no cover. Both ponds were fitted with drainage to relief ground water pressures and fitted with a leak detection system. The lining of the lagoons was carried out by a nominated subcontractor.

Six main pipelines were installed. The main deliver 180PE pipe line transferred effluent form meat processing plant across the Waitakaruru Stream via a rail bridge to the new treatment facilities. Other pipelines included a 180-dia. interconnecting pipeline, carbon feed pipeline, discharge pipeline, waste recirculation pipeline and storm water pipelines, totalling a length of 930m.

An inter-stage building between the two lagoons was built housing control valves, flowmeters, and the main MCC and Gas flare control panel. The block building was cut into the lagoon embankment and a block retaining wall and concrete slab area housed the gas flare & transformer (both Principal supplied).

Installation of Principal supplied aerators and mixers in the SBR pond and the electrical instrumentation, controls and SCADA system were also part of the project scope.

Assistance during process commissioning was provided.