Subscribe to our free weekly newsletter
Send news

News tags

mental health  physical activity  earthquake  vacancies  families  public health  children  funding  poverty  health determinants  social  Community development  planning  employment  healthy cities  volunteers  newsletter  youth  volunteering  nutrition  employment opportunity  housing  alcohol and drugs  maori  community engagement  rebuilding  wellbeing  disabilities  Lectures  counselling  Training  earthquake recovery  sustainability  event  community gardens  Community  seminar  Awards  stress  Community Groups  mens health  research  arts  smokefree  culture  men  exercise  migrants  community event  education  environment  resilience  human rights  health  medical  business  sport  conferences  survey  mental wellbeing  Courses  obesity  elderly  support group  environmental health  healthy food  health promotion  violence  pacific health  resources  rebuild  women  race relations  meeting  gardens  workshop  services  leadership  forum  water  disabled  repair  transport  prevention  pacific  dance  fundraising  asian health  sexual health  inequality  cancer  support  disasters  development  mindfulness  dementia  presentation  collaboration  health in all policies  data analysis  recovery  smoking  law  drugs and alcohol  technology  safety  cycling  Sleep  policy  parenting  media  hearing  walking  land  neighbours  social justice  qualification  resilient cities  information  community connection  consultation  oral health  bullying  depression  youth empowerment  young people  activities  non-profit  charity  harm  NURSES  addiction  disease  Communication  alcohol  symposium  submission  anxiety  accessibility  Relationships  eating  economics  Advocacy  eLearning  falls  parking  energy  efficiency  heating  insulation  advice  Eating Disorders  abuse  waste  Matariki  webinar  diabetes  workplace  Film  Climate Change  solutions  urban  management  economy  plan  restoration  Report  Vulnerability  welfare  parks  learning  awareness  emergencies  legislation  injury prevention  reading  Meeting Room  conservation  language  refugees  recreation  built environment  data  venue  urban design  Food  older people  finances  suicide  heritage  gender  recycling  breastfeeding  public  identity  Nursing  submissions  Rainbow  biodiversity  campaign  promotion  Gut Health  diversity  therapy  older adults  sexuality  computing  pollution  School Holidays  Arts Therapy  providers  gambling  Maori health  Cervical cancer  screening  trauma  autism  Governance  treaty of waitangi  care  mentoring  pets  relaxation  Professional Development  pornography  exhibition  history  discrimination  vaping  equity  lockdown  grief  rural  hygiene  participation  tourism  summer  intervention  warning  podcast  science  petition  swimming  roadworks  traffic  wildlife  beaches  pools  immunisation  vaccination  brain  preparation  open day  market  evaluation  noise  music  property  testing  crafts  CALD  cultural diversity  creativity  community events  library  Hornby  skills  placemaking  regenerative communities  journey  reflection  regional council  councillors  water management  emergency management  retirement  stress management  Christmas  family  festival  alcohol harm  waterways  planting  health protection  legionnaire's disease  hepatitis  heatwaves  river beds  nesting birds  edible gardens  water safety  Canterbury  natural resources  community organisations  reflect  fishing  gardening  workshops  stormwater  biosecurity  volunteer  plant and animal pest management 

Aeration components arriving at Christchurch Wastewater Treatment Plant

Wednesday, February 16, 2022   Posted in: Signatory Notice Board By: Administrator With tags: recovery, waste, services, environmental health

Christchurch City Council Newsline: 15th February 2022

Aeration components from around the world are arriving at the Christchurch Wastewater Treatment Plant, as the Christchurch City Council starts implementing its medium-term plan to minimise odours from the fire-damaged plant.

Six aerators are being flown in from the United States and two more have been sourced from around the country. Motors are coming from Brazil and specialised submersible electrical cabling from Australia.

Christchurch City Council Head of Three Waters, Helen Beaumont, says while work was already under way to convert two of the four clarifier tanks into aeration basins, the aerators are a vital component of the interim solution.

“Installing four aerators in each of the two tanks will pump more oxygen into the wastewater, which should help decrease the unpleasant odours and improve the wastewater quality before it enters the oxidation ponds,” Ms Beaumont says.

“We aim to have the aerators functional by the end of March. The 1st November fire destroyed the two trickling filters at the plant, and these were very important to the wastewater treatment process.

“We’re very aware of the smells that residents have been subjected to since the fire. We expect the new system, which should be in place by the end of next month, will help improve this situation, as it’s likely to be years before we’re able to fully rebuild or replace the trickling filters.”

A crane will lift four 75kw mixer aerators into each clarifier - to convert the clarifiers into aeration basins. An additional 600kw power supply will enable the aerators to continuously operate.

New submersible pumps will push the wastewater from the new aeration basins through to the remaining two clarifier tanks.

After the clarifier conversion is completed, detailed design will begin on a way to provide additional aeration into the oxidation ponds.

In the meantime, Ms Beaumont says poly aluminium chloride will continue to be added to the wastewater at two key points in the process.

This ‘poly-dosing’ settles more of the suspended solids and reduces the organic loading of the supernatant wastewater - the clear liquid from the top - that now bypasses the trickling filters and goes on to the secondary contact tanks.

The team is also adding hydrogen peroxide – a compound that naturally breaks down into water and oxygen – to the wastewater before it’s discharged into the oxidation ponds.

This week Council staff also submitted its incident report to WorkSafe. The report will be made public once all insurance claims are settled.

Get more information and updates on the recovery from the wastewater treatment plant fire.