NA-05 - Cleaning: Solids in Drain and Sewer Systems (Demo)

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Fundamentals
Origin of solids
Transport behaviour of solids
Consequences of solids entry

Origin of solids

Origins of solids - Solids entry from roof drainage systems

A significant source of solids collected from the roof drainage systems originates from the pollution and dust particles deposited by local industries. Areas with heavy industry, such as a coal power plant, have a higher level of solid particle pollution which corresponds to a higher entry of solids into the sewer system [Godeh2002] [ATV96:2007][Godeh2000].

Image:

Entry of solids through roof drainage [Source: STEIN Ingenieure GmbH]

Source: STEIN Ingenieure GmbH

Image and rendering credits Prof. Dr. Ing. Stein & Partner GmbH, Germany.

Godeh2002

Godehardt, M. (2002): Feststoffe aus der Reinigung der Abwasserkanäle, Sinkkästen und Regenbecken, KA-Korrespondenz Abwasser (49), S. 180-185

ATV96:2007

1. Arbeitsbericht der ATV/VKS-Arbeitsgruppe 3.11.1 im ATV/VKS-Fachausschuß 3.11 "Infrastrukturabfälle aus Abwaasseranlagen und Straßenunterhaltung". Feste Stoffe aus dem Kanalnetz und Sinkkästen. Korrespondenz Abwasser 43 (1996), H. 11, S. 2003-2007.

[1^st work report of the working group regarding waste from the infrastructure of drains and sewers - solids]

Godeh2000

Godehardt, M. (2000): Feststoffe aus der Kanalisation, ATV-DVWK-Bundestagung 2000, ATV-DVWK-Schriftenreihe, Bd. 20, S. 841- 850

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The entry of solids from roof drainage systems is very low compared to the amount of solids received from surface runoff. An example of the difference is shown by Xanthopoulus et al., in which total value of filterable solids collected from a buildings roof and courtyard amounted to 60 mg/l. In contrast, the soil surface runoff of the same area size indicated a maximum filterable solids value of 564 mg/l. Given its low solids impact on the sewer system, the runoff from roofs is not continually monitored [Xanth95].