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Treatment of Waste Water Streams: A Contractor's Perspective Disclosure Number: IPCOM000217187D
Publication Date: 2012-May-04
Document File: 8 page(s) / 446K

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Treatment of Waste Water Streams: a Contractor's Perspective by R C Ashton, Principal Engineer, M W Kellogg Limited Preamble

The BC-organised conference "Waste Water Management for Industry", held in Manchester, October 1994, heard papers presented inter alia on the following topics:-

Regulation, with perspectives from Water Service Companies the IWA

Legal aspects in relation to Trade Effluent Discharge
Waste Minimisation, Waste Water Minimisation, Water Wastage Minimisation Laboratory Treatability Studies
Selection and Optimisation of Waste Water Treatment Schemes
Treatment Methods:

Physico-chemical Aerobic biological Anaerobic biological

Monitoring and Control
Pollution Prevention Strategy (Environmental Quality Objectives)

The Managing Contractor for a major project in process engineering which incorporates a waste water treatment system (WWTS), must integrate many of the facets of waste water management implied in these topics in order to fidfil the contractual obligations to the Client. Taken in isolation from the complexities of the project as a whole, the WWTS must in its own right be demonstrably safe, minimise adverse environmental impact and be operable and reliable. It is, of course, axiomatic that the design ensures, within defined specifications, product stream compositions from the WWTS in compliance with local regulatory constraints.


The intention of the paper is to examine some of the constraints which impact on a Contractor in delivering to the Client a WWTS in accordance with contractual and regulatory requirements.


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Waste Water Treatment Svstem and the Performance Warra nty

Failure to meet the contractual obligations in respect of the provision and performance of an installation's WWTS definitely represents a "lose-lose" situation for the Client- Contractor relationship. If the upstream process plant production is compromised by the shortcomings in performance of the WWTS the Contractor may be liable both to pay substantial damages and risk loss of the Client for future business. At the same time the Client may be failing to generate product as anticipated, with both a loss of direct revenue from sales and extra cost arising from the need to make alternative waste water disposal arrangements. For large projects with long lead-in times the product has often been pre-sold. This has the effect of potentially impacting the WWTS's shortcomings far wider than its installed locality.

Often the Managing Contractor will employ a specialist in WWTS design as a sub- Contractor. The scope of work for the specialist may include design, supply of proprietary equipment and commissioning services. Performance guarantees in respect of the WWTS, arising fiom the contractual arrangements between the Client and the Contractor, may be passed on to the sub-contractor. However, failure of the WWTS to perform to specification still results in the undesired situation described above.

On a more positive note, t...