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FP5

AGROIWATECH Résumé de rapport

Project ID: ICA2-CT-2002-10010
Financé au titre de: FP5-INCO 2
Pays: Bosnia and Herzegovina

Bio-engineering design criteria for the development of methanogenic granular sludge starting from low- grade seed material in agro-industrial wastewater treatment systems

Based on results of the agro-industry wastewaters characterisation the wastewater from the potato industry Marbo, Backi Maglic, Serbia and Montenegro, was selected as the most suitable for the natural formation of granular biomass in an anaerobic sludge bed system.

Sludge mixture from the bottom of anaerobic lagoon in which chips wastewater has been treated and sludge from the bottom of lake was selected as inoculum. Based on the measured sludge methanogenic activity (0.13-0.20 gCOD-CH4/gVSSday), lab-scale UASB reactor was inoculated with approximately 2.5 gVSS/L of wet sludge. The experimental work aimed to develop granular sludge using a laboratory- scale UASB reactor of 24 L lasted for 79 days. A design for lab-scale Up-flow Anaerobic Sludge Bed Reactor and a manual for all analyses were done at Wageningen University (P1).

A number of typical parameters was determined in the experiment : COD fractions, VFA, pH methane, NKj, alkalinity and total and volatile suspended solids.
The selected low seed sludge, mixture of the anaerobic lagoon bottom sludge and the lake bottom sludge turned out to be appropriate inoculum for the formation of granular anaerobic sludge. The results obtained, have shown that the process of sludge granulation was followed with an increase of the treatment efficiency (over 80% at volumetric loading of approximately 4 kgCOD/m3day) and biogas production. Sludge methanogenic activity increase to 0.59 gCOD-CH4/g VSSday.

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