Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks.
A septic tank is an underground chamber made of concrete, fiberglass, or plastic through which domestic wastewater (sewage) flows for basic sewage treatment. Settling and anaerobic digestion processes reduce solids and organics, but the treatment efficiency is only moderate. Septic tank systems are a type of simple onsite sewage facility. They can be used in areas that are not connected to a sewerage system, such as rural areas. The treated liquid effluent is commonly disposed in a septic drain field, which provides further treatment. Nonetheless, groundwater pollution may occur and can be a problem.
Ngāi Tahu, or Kāi Tahu, is the principal Māori iwi (tribe) of the South Island. Its takiwā is the largest in New Zealand, and extends from the White Bluffs / Te Parinui o Whiti, Mount Mahanga and Kahurangi Point in the north to Stewart Island / Rakiura in the south. The takiwā comprises 18 rūnanga corresponding to traditional settlements.
Kaiapoi is a town in the Waimakariri District of the Canterbury region, in the South Island of New Zealand. The town is located approximately 17 kilometres north of central Christchurch, close to the mouth of the Waimakariri River. It is considered to be a satellite town of Christchurch, although in the Waimakariri for statistical purposes it is part of the Christchurch urban area.
The Ōpāwaho / Heathcote River lies within the city boundaries of Christchurch, New Zealand, and is fed from springs near Templeton Road, with a catchment area in wet weather extending as far west as Yaldhurst and Pound Road. It meanders around the base of the Port Hills from west to south-east.
The Grey River / Māwheranui is located in the northwest of the South Island of New Zealand. It rises 12 kilometres southwest of the Lewis Pass in Lake Christabel, one of numerous small lakes on the western side of the Southern Alps, and runs westward for 120 kilometres before draining into the Tasman Sea at Greymouth. Thomas Brunner, who explored the area in the late 1840s, named the river in honour of Sir George Grey, who first served as Governor of New Zealand from 1845 to 1854. The Ngāi Tahu Claims Settlement Act 1998 changed the official name of the river to Grey River / Māwheranui in 1998. The Māori name for the river system and surrounding area is Māwhera, with Māwheranui being distinguished from the northern branch Little Grey River / Māwheraiti.
Biosolids are solid organic matter recovered from a sewage treatment process and used as fertilizer. In the past, it was common for farmers to use animal manure to improve their soil fertility. In the 1920s, the farming community began also to use sewage sludge from local wastewater treatment plants. Scientific research over many years has confirmed that these biosolids contain similar nutrients to those in animal manures. Biosolids that are used as fertilizer in farming are usually treated to help to prevent disease-causing pathogens from spreading to the public. Some sewage sludge can not qualify as biosolids due to persistent, bioaccumulative and toxic chemicals, radionuclides, and heavy metals at levels sufficient to contaminate soil and water when applied to land.
Waimakariri District is a local government district, located in the Canterbury region of New Zealand's South Island. It is named after the Waimakariri River, which forms the district's southern boundary, separating it from Christchurch City and the Selwyn District. It is bounded in the north by the Hurunui District and in the east by the Pacific Ocean.
Onsite sewage facilities (OSSF), also called septic systems, are wastewater systems designed to treat and dispose of effluent on the same property that produces the wastewater, in areas not served by public sewage infrastructure.
Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge treatment is focused on reducing sludge weight and volume to reduce transportation and disposal costs, and on reducing potential health risks of disposal options. Water removal is the primary means of weight and volume reduction, while pathogen destruction is frequently accomplished through heating during thermophilic digestion, composting, or incineration. The choice of a sludge treatment method depends on the volume of sludge generated, and comparison of treatment costs required for available disposal options. Air-drying and composting may be attractive to rural communities, while limited land availability may make aerobic digestion and mechanical dewatering preferable for cities, and economies of scale may encourage energy recovery alternatives in metropolitan areas.
Christchurch East, originally called Christchurch City East, is a current New Zealand parliamentary electorate. It was first created for the 1871 election and was abolished for two period, from 1875–1905 and again from 1946–1996. It was last created for the introduction of the MMP voting system for the 1996 election. The current MP is Poto Williams, a member of the New Zealand Labour Party who was first elected in the 2013 Christchurch East by-election.
Sir Tipene O'Regan is a New Zealand academic and company director.
The Avon River / Ōtākaro flows through the centre of the city of Christchurch, New Zealand, and out to an estuary, which it shares with the Ōpāwaho / Heathcote River, the Avon Heathcote Estuary / Ihutai.
The Estuary of the Heathcote and Avon Rivers / Ihutai is the largest semi-enclosed shallow estuary in Canterbury and remains one of New Zealand’s most important coastal wetlands. It is well known as an internationally important habitat for migratory birds, and it is an important recreational playground and educational resource. It was once highly valued for mahinga kai.
Water supply and sanitation in New Zealand is provided for most people by infrastructure owned by territorial authorities including city councils in urban areas and district councils in rural areas. As at 2021, there are 67 different asset-owning organisations.
Ngāi Tahu Holdings Corporation Limited is owned by the Ngāi Tahu iwi of the South Island of the New Zealand. Its main interests are in tourism, fisheries, property and forestry and it is among the wealthiest iwi in New Zealand. Ngāi Tahu annually contributes more than $200 million to the South Island economy.
Bromley is a suburb of the city of Christchurch, New Zealand. It lies to the east of the city centre, mostly between Pages Road and the Avon river estuary.
Takapūneke, with the location also known as Red House Bay, is a former kāinga—an unfortified Māori village—adjacent to present-day Akaroa, New Zealand. Takapūneke was a major trading post for the local iwi (tribe), Ngāi Tahu, as there was safe anchorage for European vessels. The site is of significance to Ngāi Tahu as their tribal chief, Tama-i-hara-nui, was captured here by North Island Ngāti Toa chief Te Rauparaha, and then tortured and killed. The village itself was raided and subject of a massacre, with the events subsequently called the Elizabeth affair. There is a direct link from the massacre in 1830 to the signing of the Treaty of Waitangi in 1840, giving the site a status of national significance.
Charles Eldon Fayne Robinson is a New Zealand Māori artist specialising in carving. Robinson has contributed to the carving of buildings on many marae in New Zealand as well as exhibiting his art in galleries and museums.
The San José–Santa Clara Regional Wastewater Facility is a wastewater treatment plant located in the Alviso neighborhood of San Jose, California. The facility treats 110 million U.S. gallons of wastewater per day, with a capacity of up to 167 million U.S. gal/d (630 ML/d), making it the largest tertiary treatment plant in the western United States. It serves 1.5 million residents and over 17,000 business facilities in eight cities. The 2,600-acre (1,100 ha) site is operated by the San Jose Environmental Services Department and jointly owned by the cities of San Jose and Santa Clara. It began operations in 1956 to address severe water pollution issues and played a key role in San Jose's aggressive annexation program during the 1950s and 1960s.
