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Wastewater Management

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file icon Optimal Grit Removal and Control in Collection Systems and at Treatment Plantshot! 05/16/2008

Authors: Kwabena Osei and Robert Andoh

Abstract: Grit removal is a process required in both separate and combined sewer systems, and at wastewater treatment plants. The bulk of grit in collection systems results from surface water runoff from impervious areas especially during the early stages of a storm. Industrial activities and construction also generate large volumes of grit that finds its way into collection systems. This paper reviews processes for grit removal in collection systems and at wastewater treatment plants and discusses the key optimal arrangements and configurations for effective and efficient grit removal and handling. Grit characteristics and grit removal data from a number of operational sites in the US are presented together with important design features that need to be taken into account in the implementation of grit removal schemes.

file icon USING TERTIARY AERATED SAND FILTERS FOR AMMONIA REMOVALhot! 09/25/2007

Authors

Barter, P. and Smith, J.

Abstract

With the challenge of meeting new tighter ammonia consents in municipal wastewater treatment, tertiary aerated sand filters, combining the solids removal aspects and selfcleaning properties of continuously backwashed up-flow filters (CoUF’s) with the ammonia conversion capabilities of an attached growth filter are becoming increasingly popular. With specific reference to the DynaSand / DynaOxy system, this paper examines how the filters work, covering their form and operation and what mechanisms are used in their control. The optimisation of process air requirements to maximise the ammonia conversion effectiveness of biomass is considered, along with energy consumption issues and operational practices required to ensure efficient operation in the longer term. The results of a monitoring study of a full-scale installation treating a dry weather flow of over 2000 m3/day are presented.

file icon Perspectives of different parties involved in the selection of capital equipment for seweragehot! 06/16/2007
Authors
M. G. Faram, J. M. Saker & V. M. Story
Abstract
This paper presents a study of UK water industry capital equipment selection, focusing in particular on behaviour in relation to sewerage/combined sewer overflow (CSO) and wastewater-associated investment activities. Valuable new insights into the perspectives of different parties, including water service providers (WSPs), design consultants and construction companies, are provided. Through analysis of over 200 questionnaires, equipment selection is confirmed to be multi-organisational, with different parties dominating different roles. Among the selection criteria, service and quality are found to be valued as parameters worth paying for. Relationships and sustainability considerations are also found to be important, although views on whether sustainability benefits will be paid for are divided. While interparty alignment of views is generally good, there are occasional discrepancies at the individual water region level. It is suggested that optimisation might derive from recognising the significance of intangible components of the supplier offering, and managing relationships to allow these to be capitalised upon.
file icon EVOLVING METHODS FOR THE CALIBRATION OF FLOW CONTROLS FOR STORMWATER AND WASTEWATER MANAGEMENThot! 09/26/2006
Authors
LeCornu, J.P. and Faram, M.G.
Abstract
The ability to accurately and reliably control flows in drainage and sewerage systems is critical for the effective operation of such systems. The use of inaccurate or unreliable flow controls can lead to adverse effects including flooding. Conventional methods for the calibration of flow controls are time consuming and can suffer from poor repeatability.
This paper describes work carried out with the aim of developing new, improved methods, to both enhance accuracy and improve repeatability, while also reducing test times. In order to achieve the objectives, a PROFIBUS based instrumentation and control system was fitted to existing hydraulic test facilities, operated by Hydro International. The new methods, applied to the calibration of vortex flow controls and orifice plates, show potential to reduce test times by a factor of more than ten, while also increasing the accuracy and repeatability of results.
file icon Wastewater Treatment Using Hydrodynamic Vortex Separatorshot! 09/16/2004
Authors