Standard price: £29.00

Currency:

Available as an ebook:
Please purchase via www.iwaponline.comOpens in new window

Also part of Water Intelligence Online Digital Reference Library

Standard ePrice: £29.00

+ VAT

Purchase ebook

Author(s): M Abu-Orf
B Ormeci

Publication Date: 30/06/2004

Pages: 90

Binding: Paperback

ISBN13: 9781843397137

eISBN: 9781780404158

WERF Report 01-CTS-32ET

OverviewExpand or collapse me

 

The ability to measure sludge network strength is important in sludge dewatering applications because it can be used to determine optimum polymer dose for conditioning to achieve good dewaterability. This was demonstrated in laboratory and in full-scale dewatering and thickening.

The network strength increased as the polymer dose was increased, however, at the optimum dose a "drop" in the network strength occurred. Further research is needed to verify this concept at full scale and to provide a robust technology to the water and wastewater treatment industry. A second phase is sought through WERF funding.

Rheometry was used for determining the sludge network strength. This report also formulated and demonstrated a standard protocol for measuring network strength in terms of energy dissipated in a certain volume of sludge. Two protocols for measuring network strengths by either torque or concentric cylinder rheometers are described in this report.

A mathematical derivation has shown that area under rheograms, namely the curves which were developed by plotting shear rate (1/sec) versus shear stress (Pa) and time (sec) versus torque (mNm), indicated the rate of energy dissipation within the sludge system and the total dissipated energy was related to the network strength.

The research did not intend to measure the "absolute" network strength, rather a comparative strength of different aggregates using the same instrument and under the same measuring conditions.

Share this page:

The latest from @IWApublishing

RT : Sludge Management In Circular Economy SMICE2018 Rome https://t.co/xXhYCDLxN6 1 day 5 hours ago
RT : Time for reading some posters at the SMICE2018 https://t.co/I2CdkiOgwM 1 day 11 hours ago
RT : Our 1st paper with the new journal is now published; result of industry &… https://t.co/Ehl5vvwgqS 2 days 11 hours ago