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sewage infrastructure management

sewage infrastructure management

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    sewage infrastructure management sewage infrastructure management Presentation Transcript

    • United Nations Environment Programme Division of Technology, Industry, and Economics
      • municipial sewage = domestic + commercial + industrial wastewater
      • wastewater management has seen very little change
      • sewage industry is huge  Government responsibility ( municipalities +other levels )
      • Authority varies (for the construction & management of plants, trunk sewers and branch collectors)
      Trunk sewers Storm sewers & tanks www.iconeng.com/past_projects.htm
      • UAE: In AD, Dubai & Sharjah: local Water &Electricity Authorities ,
      • Northern emirates : Ministry of electricity &water
      • Expand & Expand….
      • Sharjah Population 500,000  800 000 since 2004
      •  extension of (STW).
      • 2004 total treatment capacity : 148,000 m 3 of sewage /day (satisfy >50%) – Science Direct Journal:41,8
      • Dubai : The Drainage & Irrigation Dep of Municipality  new sewage treatment plant in the Aweer area , for 330,000 gallons of sewage water per day. 100,000 gallons /day of treated water for irrigation ( uaeinteract.com,2005)
      • Ajman signs Dh815m sewage finance deal: Municipality will supervise the 2 companies
      • Abu Dhabi : Mafraq STWE - The largest sewage treatment of its kind in the UAE
    • NOW: huge surge in its privatization : DEVELOPERS forced Municipality unable to support /receive all the sewage Private sewage plants like Eagle Electromechanical, Arabian Ranches, expanded tenfold since 2000 (Hijaz, 2007) Q: Will others private companies be allowed in market?
      • Environmental & health: proper drainage & disposal of wastewater; nutrient& water recycling,
      • Preventing floods
      • Preserving receiving water quality
      • Economic: resource recovery/
      • optimization
      • water is a precious resource! plan should encompass a water cycle that has a minimal env impact, involves efficient water and wastewater systems
      • Water Issues:
      • 2.75 billion people, or 50 % of the world’s population, still lack water enough for sanitation and public health
      • year 2025, 2/3 of the world population will suffer from a water crisis
      • UAE: Water is the scarcest resource in the sandlands
      • climate: dry
      • Water resources : ground water, desalinated & recycled sewage water.-
      • No falajes left in ALAin
      • Desalinated water :satisfy 70% of the total potable water needs (250 million gallons per day =11 % of World ( Abu Dhabi Chamber Of Commerce & Industry )
      • Abu Dhabi Emirate Water Production, Coutesy of EAD
          Abu Dhabi Emirate Water Production                     AD WATER CONSUMPTION BY SECTOR   2003
      • Examples:
      • Singapore “NEWater”:public utility (mixed with reservoir water then treated
      • Tokyo 1984 water recycling centre: lower charge toilet flushing
      • Sharjah, UAE : “Most residents around Rolla Square have been using drinking water to flush toilets..”(Secretdubai , MAY, 2006)
      • For: watering green areas, fertilizer extraction, recharging ground water reservoirs
      • Dubai : Now it’s a big business : greenery & golf courses
      • Abu Dhabi is the green capital of the Gulf.
      • High quality treated sewage: less contaminated than desalinated water by <0.1% (below 1,000mg/litre.
      • UAE desalinated water :
        • heavily accused of causing cancer
        • billions of dollars of expansion (in AD: by 200 fold in the last 25 years before 2000, but reviews still predicted shortfalls (demand will increase from142 to 600 million gallon per day by 2010- unlimited
        • Recycled Sewage water?
      • http://www.ec.gc.ca/water/images/manage/effic/a6f4e-rev.gif
      • Sewage Collection: combined or separate sewers
      • Pumping Stations: gravity & pumping  plant
      • (rainwater  sub/surface aquifers )
      C. Wastewater Treatment Plants ( role: remove pollutants & discharge effluent
      • Grit Chamber(settling & screening)
      • 1 Sedimentation Tank (2-3 hrs
      • Aeration Tank (6-8hrs) & Activated sludge (m/o)
      • 2 Sedimentation Tank
      • sludge treatment :
      • 1.dehydrate & burn  ash ( 1% of the original volume)
      • 2.Fertilizer, or 3.landfill
      • Includes:
        • installation of the collection system & machinery
        • engineering and construction ( of pumping stations , treatment plants , infrastructure
      • Urban construction considerations:
      • 1.Underground Obstacles, rerouting (time & money)
      • 2. Space & land,
      • 3. interfering with other projects ex: road construction, waterways
      • 4. Disposal of Soil
      • 5. Cooperation of Stakeholders ex: ex: ISO14001, meetings, public input
    • Road & sewage network projects Same will be done at Al Abbar and Al Hazzanah areas next year Target: promote Sharjah civil services @ a cost of Dh. 1.42 billion Within 3 years
      • master plan of Sharjah major projects includes the 7 th phase of the sewage station expansion to link new areas (Dh. 100 million)- Halcrow (since 1969)& CCIC
      • 1 st phase of STW was commissioned in 1978
      • Al Waha, No.39: “ More than 20 areas got linked (completely) to sewage project . The rest on the way”. Road projects are still running ‘”in full swing”
      • “ The City of Sharjah appeared to be a huge
      • workshop that does not stop at any
      • Time… to provide all means of prosperity”..
      • “… Perhaps people were annoyed or got
      • angry against traffic jams at construction
      • Sites.. We do understand but understand!!
      • [& we invite you to cooperate] Director General
      • municipality blamed , roads have been diverted and somewhere blocked..
      • Gov Websites for public : contacts and recommendations http://www.westwiltshire.gov.uk
      • (Dubai)shocked engineers :“We have found shirts, bras, mobile phones, pants and rocks,” (Blue Gold & EWP Blog)
      • uaeinteract.com, 2007 : “[Private]Plant to treat oil waste soon- treat and process 50 m3
      • oily waste clogs network & kills bacteria
      • Director of Drainage & Irrigation Dep blamed tankers from restaurants
      • Municipality will supervise
      • install grease separators , recycling charge : 250 to Dh300
      • Dubai Now : 3 sewage and hazardous waste treatment plants , 1 at Al Aweer, 2 Jebel Ali. None treat oil/grease waste . (Emirates Today)
      • Should be preventive (sewer systems unseen  get little attention  reactive/complaint-driven management)
      • Note that sewage facilities operate under severe 24-hr conditions .
        •  Maintenance needed (regular inspections, cleaning and repair )
        • new techniques to reduce costs.
      • A. Sewers (mains &piplelines): affected by external factors  pipe break/crack.
      • B. Pumping Stations : issues: heavy rain, need also constant operation .
      • C. Wastewater Treatment Plants: requires trained operators & financial resources (complexity & capacity)
      • Information Systems & others improve efficiency & reliability of inf. (Tokyo)
      • Rainfall Information Systems (floods)
      • Sewage Mapping and Data Management Systems : allows to systematize sewage facility & create a database for operational purposes ex: Tokyo
      • Enhancing Green Space and Recreational Opportunities : harmony with surrounding area/env, allow integration of green space/ recreational facilities . (ex: green roofs)
      • AD: the largest sewage treatment plant ,Mafraq STWE: Support a green oasis & wildlife
      • B. Preventing Odours and Emissions/ smoke (resident comfort)
      •  contain & deodorize (chemical/biological methods)
      • C. Measures against &quot;urban flooding”:
      • 1.Capacity increase (of sewers& pumping stations)
      • 2.rainwater storage tanks & infiltration facilities to control inflow
      • D. Improving the Performance of Combined Sewer Systems (CSOs):
      • interceptor strategy :
      • 1)CSO storage tank
      • 2) screens
      • secretdubai (Nov 2005): “ Oh we do like to be beside the Creekside , But maybe not to actually swim in it”
      • One in 20 people become ill from swimming in waters polluted by sewage ( Vandeweed, 2004) (study: islands drowning in rubbish )
      • jet ski rental at Garhoud Bridge used to be within the infected area (1 s.treatment plant used to exist)
      • Khor Khalid-Sharjah
      • 1. Utilization of Reclaimed Water : only about 4% of all water produced by Mafraq i s re-used (EAD)
      • 2. Utilization of Sludge :useful by-products derived from sludge -ash :
      • Concrete ex reinforced-concrete pipes ,
      • Lightweight aggregate ex water-permeable construction materials
      • Compressed baked blocks ( press and burn technology) 1050 Celsius  durable interlocking bricks  pavement and park landscaping .
      • Sludge melted slag ( 1500 °C to burn organic, inorganic remainder used: ½ volume, highly stable with no heavy metals dissolution  used in road bed or construction materials
      • 3.Utilize Wastewater Heat  ( energy savings & reduced air pollution
      • ( Dubai advanced cooling systems)
      • 4. (Industrial ) Pretreatment Requirements: effluent standards, monitoring, inspections
      • 5. financial accounting system : local public utility mostly responsible, promotes effectiveness & incremental improvement
      • sources of revenue : often national subsidies, bonds, and funds from general tax, remainder from user fees .
      • UAE: Dubai Industrial City 2007 agreement  Dubai Recycling Park (the 1 st fully integrated waste management & recycling park in the Middle East.
      • It is believed that it will be their most important project from a socially responsible stand point & that it should be replicated across the region.
      • Dr Clifford Randall: “Building dykes may be in Dubai’s future” (Global Warming)
      • “ By 2020, the effects will be massive”
      • UAE: Emirates inaugral global warming conference 2007: “Cut Pollution Now” (recyclingdubai.com-News)
      • http://uaeinteract.com
      • http://www.adcci.gov.ae:90/public/media/Magazines/april2001/local.htm
      • http://www.unep.or.jp/ietc/publications/Freshwater/FMS10/7addressing.asp
      • http://www.biwater.com/case_studies.html?id=7&serv=%2Four_services%2Fwastewater_treatment
      • http://www.questjournalists.com/index.php/site/treated_water_clean_pure_sewage_sir/
      • http://www.westwiltshire.gov.uk
      •   http://www.sciencedirect.com
      • http://secretdubai.blogspot.com/search/label/environment
      • www.unep.org/cpi/briefs/Brief02April04.doc
      • http://www.ead.ae/en/?T=2&ID=179
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