Treatment Processes

Engineering Biological Wastewater Treatment for The Removal of Hazardous Chemicals from Activated Sludge Plants

Reference: 17/WW/04/19
ISBN: 1 84057 847 5
Published Date: 13/12/2017

The aim of this project was to assess if biological treatment processes at wastewater treatment works could be engineered to improve the efficiency of hazardous chemicals (HCs) removal. 

In this case, the effect of the engineering process parameters Solids Retention Time (SRT), Hydraulic Retention Time (HRT), temperature on microbial diversity were studied to identify those conditions that were most conducive for microbial degradation of HCs.

Price: £50  

Optimising the Balance Between Primary and Secondary Treatment - Report

Reference: 15/WW/04/18
ISBN: 184057 755 X
Published Date: 01/04/2015

Realising financial value through energy generation from treatment of sewage sludge and optimising operational performance for wastewater plants are two key drivers for water utilities. Optimising the treatment process requires a balance of increased primary solids removal, reduced load on secondary treatment processes, and assessment of effect on biogas yield from treatment of those solids.

Outputs from optimisation studies will provide information to assess the business case for investing in operational activities to improve the biogas yield. UKWIR commissioned the development of a model that enables changes in primary sludge solids capture to be quantified. The model is a spreadsheet tool which allows the assessment of the impact of operational changes to primary treatment processes.

Site operational data are necessary to configure and validate the model, to establish the baseline conditions against which projected variations to the primary treatment process can be assessed. The model was tested (trialled) on two working UK WwTWs.

Price: £37  

Technical Study into Heat Sinks in Wastewater and Sludge Treatment

Reference: 12/WW/05/6
ISBN: 1 84057 621 9
Published Date: 02/04/2012

The objective of this project was to investigate the potential for exploiting the Renewable Heat Incentive (RHI), a government economic incentive, as an additional revenue stream within the wastewater and sludge treatment industry.
The main finding of the project is that there is scope for the industry to benefit from RHI. The most likely application would be through the export of surplus biomethane into the national gas grid. Favourable indicators include a proximity to a suitable medium pressure gas connection and high net gas yields from advanced anaerobic digestion.
Exporting heat from sewage treatment facilities is unlikely to offer an opportunity, as the capacity threshold stipulated in the RHI is lower than the potential output of all but the smallest digesters found in the industry.
Export is also unlikely from the industry's current generation of incineration plants, which have been designed primarily as a means of sludge disposal rather than as energy generators. However, it is possible to envisage a new generation of incineration plants, configured to meet good quality combined heat and power criteria, which could act as a source of heat for some facilities.

Price: £14