Institute for Sanitary Engineering, Water Quality and Solid Waste ...

Waste Water Technology AWT
Figure: Possible treatment of industrial wastewater
Investigations on Nutrient Recovery from Anaerobic
Digestion Residues with Different Compositions
The goal of the project is to investigate the feasibility
of using struvite precipitation to recover nutrients from
digestion residues. The investigation mainly consists
of laboratory scale experiments and comparative evaluations
using computer applications. Practical investigations
have been completed within the past months
and the project is currently in the evaluation phase.
The practical investigations were conducted by two
institutions. Ortadogu Teknik Üniversitesi operated laboratory
scale batch anaerobic reactors for the digestion
of poultry manure and wastewater treatment plant
sludge mixtures in different ratios, and conducted struvite
precipitation experiments in both solid and fluid
phases of digestion residues. The resulting products
were examined using microscope and X-ray diffraction
techniques. Additionally, the concentrations of N, P, Mg
and other significant metals were determined to create
a mass balance. In the first phase of the project the
University of Stuttgart conducted struvite precipitation
experiments in synthesised digestion liquor in order
to understand the system and determine the mechanisms.
Meanwhile, the results were transferred onto a
chemical model together with the chemical data from
the analyses of the partner institution to estimate the
potential reactions in the investigated complex type of
process waters. The modelling phase was followed by
a short verification phase applying struvite formation
on real digestion residues. The resulting products were
also examined as mentioned above.
The cooperation intended to support the scientific exchange
between the partner institutions. One Master’s
Thesis and one Diploma work were created within the
project. A close collaboration was performed by visits
from both institutions, enabling an ambilateral exchange
of experience.
Funding:
Internationales Büro des Bundesministerium für Bildung
und Forschung
Funding Period:
02/2008 - 01/2010
Project partner:
Ortadogu Teknik Üniversitesi (Ankara, Türkei)
Project Manager:
Prof. Dr.-Ing. H. Steinmetz und Prof. Dr. G. Demirer
Contact Person:
D. Antakyalı, M.Sc.
Internet:
http://www.iswa.uni-stuttgart.de/awt/en/research_
current.html#intenC
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