Water Kit - Hunter Water

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3.3 raymond terrace WWTW Raymond Terrace WWTW Raymond Terrace WWTW serves about 25,000 people in Raymond Terrace and Medowie. Control and monitoring The entire wastewater treatment process is automatically controlled by a series of computers that are linked to Hunter Water’s main computer system in Newcastle. Department of Environment and Conservation licence parameters. Hunter Water also submits an annual report to this department to confirm that the facility has been operating within its licence. The upgraded Raymond Terrace WWTW The new Inlet Works is completely covered to control odour The original facilities were constructed in 1980. An upgrade was carried out to improve the quality of effluent produced at the facility and cater for the area’s population growth. To plan for this upgrade an Environmental Impact Statement was prepared and publicly exhibited, with approval for the upgrade granted by the state government. The upgraded Raymond Terrace WWTW is capable of treating an average flow of over 6.5 million litres per day, with the capacity to serve a population of approximately 29,500 people. Provision has been made in the design of the plant to allow for an upgrade to 35,000 people if required. Benefits of the Raymond Terrace WWTWThe Raymond Terrace WWTW was designed and built to treat wastewater to a high standard and to have a minimal impact on the environment. This has been achieved by collecting wastewater from houses, business and industry via pipes and pumping stations, and directing it to the WWTW. The wastewater is treated to a high standard, disinfected and then discharged into Grahamstown Drain which then flows into Windeyers Creek and the Hunter River. Where it is economically viable, treated wastewater is recycled and used in activities such as the irrigation of golf courses and for industrial purposes. The collected residual solids (or dewatered sludge) are called ‘biosolids’ and are reused for activities such as minesite rehabilitation. To ensure that the facility is operating efficiently, sampling and testing are conducted on the holding tanks and discharge waters. The results are analysed to ensure the treatment processes continue to meet the Wastewater treatment at Raymond Terrace Inlet Works The inlet works receive wastewater through four sewer mains. The inlet works house the step screens and the grit tank.This area is covered and kept under constant vacuum to contain odours, which are then passed through a soilbed filter. Soilbed Filter The organic soilbed filter consists of layers of gravel, soil, peat and bark chips. This soilbed allows the growth of natural bacteria which breakdown and disperse odours. Step Screen Large objects and solids present in the wastewater are removed using two fine automatic step screens. The bars on the two screens are 5mm apart and can treat up to 1000 litres per second. The screenings are washed and dewatered and then disposed to landfill Water kit . ssS . 001 . april 2010 7
Grit Tank Inorganic grit material in the raw sewerage is removed using centrifugal grit chambers. The settled grit is dewatered and stored in a 1 cubic metre bin for disposal to landfill. Bioreactor A new bioreactor has been constructed to provide the additional non-aerated zones required to enhance the plant for biological phosphorus removal. The naturally forming bacteria are fed with the wastewater/sewage and then moved to the carousel for further treatment. Carousel Tank The carousel tank provides both aerated zones and unaerated zones. The suspended solids, organic matter, nitrogen and phosphorus are further broken down by naturally occurring bacteria into simple gaseous and solid particles. Clarifiers The wastewater from the bioreactor flows into four clarifiers where the biological solids settle from the clear effluent. The solids are recycled back into the bioreactor. Clear effluent overflows from the clarifier and flows on to the disinfection system. DISINFECTION AND DISCHARGE The clear effluent is subjected to a bank of concentrated ultraviolet light to kill potentially harmful pathogenic organisms. The final effluent is released into Grahamstown Drain, which then flows into Windeyers Creek and the Hunter River. Sludge TREATMENT The sludge remaining from the main process is aerobically digested to stabilise the sludge. This reduces odour potential and pathogens. After digestion the solids are separated from the liquid using a belt filter press and dewatered biosolids are reused in agricultural and minesite rehabilitation projects. Water kit . ssS . 001 . april 2010 8
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Water kit . ssS . 001 . april 2010
Page 3 and 4:
introduction to water supply WATER
Page 5 and 6:
introduction WHY STUDY WATER? Water
Page 7 and 8:
1.1 the water cycle INTRODUCTION Mo
Page 9 and 10:
BREAKING THE WATER CYCLE To supply
Page 11 and 12:
Hunter Water’s area of operations
Page 13 and 14:
Protecting and managing the catchme
Page 15 and 16:
Water From The Mountains Chichester
Page 17 and 18:
Rewarding Water Conservation A new
Page 19 and 20:
Main infrastructure of Hunter Water
Page 21 and 22:
1.6 the managing groundwater supply
Page 23 and 24: Water Sharing Plan for the Tomago,
Page 25 and 26: Monitoring the Hunter catchment The
Page 27 and 28: Environmental Hunter Water: • Dev
Page 29 and 30: The Expanded Polystyrene (EPS) was
Page 31 and 32: labour is invested on the site annu
Page 33 and 34: influences on water supply in the h
Page 35 and 36: ainfall patterns and water supply w
Page 37 and 38: managing water supply sustainably w
Page 39 and 40: 1.8 Sustainability & Water Supply S
Page 41 and 42: Links with THE Syllabus Used collec
Page 43 and 44: Integrated Water Resource Plan The
Page 45 and 46: 2.2 being waterwise at home Our wat
Page 47 and 48: 2.3 being waterwise at school Water
Page 49 and 50: 2.4 school water audit Why DO A wat
Page 51 and 52: 2.6 think twice water saving campai
Page 53 and 54: design a water saving campaign work
Page 55 and 56: assessing water conservation scheme
Page 57 and 58: 8 Use wetlands to store stormwater
Page 59 and 60: water audits - a case study workshe
Page 61 and 62: desktop water audit worksheet 4 Ask
Page 63 and 64: asic water audit worksheet 5 Leakin
Page 65 and 66: environmental audit protocol worksh
Page 67 and 68: water conservation resource list 2.
Page 69 and 70: Links with THE Syllabus Used collec
Page 71 and 72: These controls specify the quality
Page 73: wwtw population communities daily v
Page 77 and 78: 3.5 stormwater management What is s
Page 79 and 80: 3.6 managing stormwater with sqids
Page 81 and 82: ) Suggest strategies that might be
Page 83 and 84: Does it transport rubbish down into
Page 85 and 86: stormwater in your school worksheet
Page 87 and 88: improving wastewater worksheet 4 2
Page 89 and 90: support material This section conta
Page 91 and 92: International WEBSITES: Ecoschools
Page 93 and 94: LOWER HUNTER CENTRAL COAST REGIONAL
Page 95 and 96: agency project focus amount contact
Page 97 and 98: 4.5 glossary Aerate To charge or tr
Page 99 and 100: Shoreline outfall Disposal of treat
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Water Kit - Hunter Water

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