Pollutional aspects of gross solids and their interaction with sewer sediments

Abstract

This paper describes a study programme underway in the upper Perth Road catchment in Dundee to estimate the effect of gross solids and their interaction with the sediment found within a combined sewer network. Gross solids have been collected at three different sites in the study catchment, near its head, at the catchment outfall and at an intermediate site. In conjunction with the study of gross solids, sewer sediment samples were collected and analysed to determine both their chemical and physical characteristics. The study also includes flow sampling (both dry and storm) and gully discharge monitoring. The pool of pollutants information thus collected includes surface derived, foul flow and gross solids pollutant characteristics. The objective of the study programme is to analyse the contribution made from the various inputs and to produce a budget of pollutants within the study sewer system. A description of the field and laboratory work undertaken in the study is described, together with a preliminary assessment of the pollutants budget technique.

Quantifying physical disintegration of faeces in sewers: Stochastic model and flow reactor experiments

“…In downstream sections, GSs are expected to be moved more easily (Staufer et al, 2011;Penn et al, 2017 (a,b)) due to higher flow velocities. Due to deposition and physical disintegration of faeces and toilet paper they are expected to be found mostly in the upper parts of the sewer system (Verbanck et al, 1994;Milne et al, 1996). At downstream links, other GSs such as plastic and sanitary products are expected to dominate (Evans and Eadon 2005).…”

Gross solids from combined sewers in dry weather and storms, elucidating production, storage and social factors

“…The sewer sampling methodology for collecting aesthetic pollutants during dry and wet weather conditions was developed from previous work (Balmforth et al, 1995;Meeds, 1995;Milne et al, 1996) that involved sampling of aesthetic pollutants in CSOs and large sewers. Flow survey loggers were used to record sewer flow velocity and depth, with rainfall being recorded by 0.2 mm tipping bucket rain gauges (Digman, 2003).…”

Computational Fluid Dynamics Analysis on Filtration Effect of Non-Point Source

“…The road runoff that occurred during rainfall inflow to sewage including various pollutants cumulated on surface of road. In case of exceeding capacity of intercepting sewer pipe, that is not carried to sewage treatment plant, and non-intercepting discharge are out flowed to river via storm overflow diverging tank [1][2]. Likewise, CSOs is discharged to receiving body of water (like river, dam, and etc.)…”