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FP5

Simultaneous calorimetric and respirometric measurements for textile wastewater characterisation

Project ID: EVK1-CT-2000-00063
Funded under: FP5-EESD

Abstract

This report is one of the deliverables of Project TOWEF0 (Towards Effluent Zero).

Isothermal direct calorimetry has been applied to investigate aerobic biodegradability of mixed final effluents from two textile factories. For this purpose, a bench scale calorimeter (Bio-RC1), especially modified for biological studies and equipped with a dissolved oxygen (DO) probe, has been used. Through pulses of selected substrates (textile wastewaters, acetate or ammonia), aerobic metabolic activity has been assessed for heterotrophic and autotrophic nitrifying bacterial populations in sludge samples from wastewater treatment plants treating domestic and/or textile effluents. Calorimetric data (thermograms) have been compared to DO measurements simultaneously carried out (respirometry), so that wastewater stream degradation has been characterised in terms of microbial heat dissipation and short term biological oxygen demand. A satisfactory agreement was observed between OUR (Oxygen Uptake Rate) profiles and power-time curves confirming that, under strictly aerobic conditions, calorimetry and respirometry provide the same information. Oxycaloric equivalent, defined as the amount of heat released by the culture per mole of oxygen consumed, was estimated when textile wastewaters were the sole exogenous substrate. The values obtained are close to the theoretical value for heterotrophic aerobic metabolism (460 kJ mol O(2) -(1)) and to literature data. Additionally, toxicity effect on microbial communities due to raw wastewater additions has been investigated.

Additional information

Authors: DAVERIO E, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Inland and Marine Waters Unit, Ispra (IT);LIGTHART J, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Inland and Marine Waters Unit, Ispra (IT)
Bibliographic Reference: EUR 20557 EN (2003), 31pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail: jrc-publications-office@ec.europa.eu
Record Number: 200316187 / Last updated on: 2003-04-21
Category: PUBLICATION
Original language: en
Available languages: en
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