Wastewater

Wastewater management systems that serve communities efficiently while returning treated wastewater to the environment with minimal effect are necessary outcomes for a sustainable world. Harrison Grierson engineers work closely with all project stakeholders to deliver solutions that meet the needs of the current and future generations.

Wastewater treatment employs wastewater management strategies including all aspects of liquid and solids processing, as well as effluent disposal for both municipal and industrial clients. Services include master plans, feasibility studies, pilot plant studies, conceptual design, final design, construction management, startup and training, operations troubleshooting, and process and energy optimization. Key aspects of effluent disposal are reuse opportunities, as well as water quality issues with respect to nutrient requirements.

Harrison Grierson process engineers conduct extensive process design; process optimization and troubleshooting; preliminary and final design for primary, secondary and tertiary treatment; ultraviolet (UV) disinfection; aerobic and anaerobic digestion; nutrient removal; and odour/air emissions control. We work in a multidisciplinary environment where wastewater management is approached in comprehensive and innovative ways.

To plan for wastewater network extension or improvement projects, a variety of services are provided by our engineers such as master planning, route selection and sewer design, consent applications, sewer overflow control technologies, rehabilitation programmes. Advanced design tools such as geographical information systems (GIS) and computer modelling are used to ensure the accuracy and efficiency of each wastewater management project.

	Kawakawa Bay Sewerage Scheme for Manukau Water Limited The construction of this first time sewerage scheme for the community at Kawakawa Bay has helped restore this popular swimming beach to its former, pristine state… view pdf
	Te Aroha MBR plant for Matamata Piako District Council Te Aroha wastewater treatment plant was upgraded in 2006 to significantly improve the treatment performance of the conventional oxidation ponds system. This was the largest municipal MBR plant in New Zealand... view pdf
	Te Awamutu WWTP for Waipa District Council The water quality of the Mangapiko Stream has been successfully restored following our upgrade of the town’s wastewater treatment plant. A new, multi-zone, activated sludge treatment process was designed to... view pdf
	Tirau WWTP for South Waikato District Council An innovative solution was adopted for the 2006 upgrade of this 1970’s primary stage wastewater treatment plant to one of the most modern treatment processes in Australasia... view pdf