About WRc | Portfolio Programme | Help | Contact Us  
Portfolio Logo WRc
Home New Ideas New On Site New Starts Proposed
Research
Live
Research
Completed
Research
Your List
Search
Browse

Asset Maintenance
Asset Management
Benchmarking
Business Planning
Business Processes
Carbon Footprint
Carbon Management
Catchment Management
Climate Change
Competency
Customer Service
Data & Information
Data Management
Demand Management
Distribution Management
Drinking Water Quality
Emergency Planning
Energy
Energy Efficiency
Environmental Management
Environmental Policy & Legislation
Finance
Innovation
Instrumentation
Investment Planning
Leak Detection
Leakage
Metering
Metering & Charging
Monitoring
NCET
Odour Management
Operating Costs
Pipeline Materials
Real Time Control
Receiving Water Quality
Regulation
Resource Management
Risk Assessment
Risk Management
Sewerage
Sludge/Biosolids
Spatial Information
Standards/Regulation
Strategic Planning
Supply Demand Management
Technology
Technology Development
Underground Assets
Waste
Waste & Resource Management
Waste Management
Wastewater Treatment
Water & Wastewater
Water Distribution
Water Quality
Water Resources
Water Treatment
Water Treatment Waste
Water Use
WFD

Printer Friendly VersionSelected Information - Completed Research

CP107  Optimised Waterworks Sludge Thickening Water Treatment
The treatment and disposal of coagulant sludge was a major and increasing proportion of water treatment operating costs. Optimisation of sludge treatment was needed to reduce costs while ensuring that the revised regulatory limit for acrylamide monomer (0.1µg/l) is met.

Efficient thickening (de-watering) of the dilute sludges from clarification and backwash settlement was central to efficient sludge management. Many widely used, continuous "rake type" thickeners, were underperforming due to: overdosing of polyacrylamide floculant-aid causing sludge blankets to congeal; inadequate design of inlet arrangements so there was insufficient floc shear; oversizing of thickened sludge transfer pumps.

The research was undertaken by WRc and British Hydraulics Research (BHR) who optimise thickener operation and demonstrated compliance with acrylamide limits by:

  • Identifying benchmarks for sludge thickener performance
  • Developing tools and procedures for assessing thickener performance
  • Auditing a sample of thickeners
  • Producing a step-by-step guide to auditing and optimising thickeners.

Benefits

  • Performance benchmarks will allow underperformance (and underlying causes) to be identified rapidly
  • Cost-effective improvements to thickener operation to reduce operating and disposal costs
  • Ability to demonstrate that the regulatory target for acrylamide monomer is being met.
WRc's Portfolio Programme
Summary of the £1.5 million per annum research programme

More details...

About WRc | Portfolio Programme | Hot Topics | Help | Contact Us