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Optimised complex technology for grease waste utilisation

Development of complex technology for purification of wastewater polluted by grease, based on separation of pollutants by using mechanical methods and biodegradation of the residuals, and biodegradation of separated pollutants at cleaning sites.

WASTEWATER TREATMENT PROBLEMS IN MEAT, FISH AND OIL PROCESSING INDUSTRIES. The meat, fish and oil processing industries are highly developed in European Union countries. The wastewaters from the above industries contain high levels of melted grease, oil and blood. About 1 million cubic meters of wastewater polluted by grease, blood or oil is formed in Lithuania each year. The wastewater is transferred into the municipal or village biological treatment system. The wastewater discharges containing high concentrations of grease hamper the work of biological treatment processes; the process is power consuming too. The biological treatment process is slower due to seasonal temperatures in northern European countries. Therefore the limit of melt grease concentration in wastewater is defined. High concentrations of grease silt up the pipeline of wastewater collection systems. Therefore complex and frequent pipeline purification is used. The degradation problem of polluted sludge is not solved. The utilisation process of concentrated technical grease is expensive and complex. According to European Union legislation, the concentrated grease and other wastes polluted by grease have not been thrown on the dump. SOLUTION TO THE PROBLEM We offer progressive technology for cleaning up different types of grease pollution. The technology is based on grease biodegradable microorganisms. Several microorganism-lipase producents are selected and stocked in the culture museum in JSC BIOCENTRAS. According to the laboratory test results, used microorganisms destroy the grease pollution. Different grease pollutants are composed of different fatty acids. Therefore the bio-preparation has to be designed of complex microorganisms. For selecting the complex of the most active biodegrading strains of microorganisms, it is necessary to carry out laboratory experiments and develop prototype devices under industrial conditions. It is expected that the utilisation price of grease pollutants by use of a developed bacterial agent will be two times lower when compared to the traditional way. The developed bacterial agent will be used in compost technology. Grease separated from water using mechanical methods and other solid wastes polluted by grease will be compounded with ground and also treated by biodegradation on the special cleaning site. The objective of this project is to develop inexpensive and efficient technology for utilisation of grease pollutants. According to this technology, the organic wastes are separated from wastewater by mechanical methods and the remaining pollutants are removed by biodegradation. The separated grease wastes are accumulated in the special cleaning sites, compounded with ground and treated also by biodegradation. Application of phytoremediation is also foreseen for enhancement of the soil quality for its further environmentally safe use. Technological decisions are based on the cleaner production/pollution prevention concept. The novelty of the project is in the development of a new bacterial agent for grease utilisation in water and soil, the development of pipeline clean up technology, and the development of solid grease waste compost technology. The following advantages of the proposed technology can be highlighted: * the bacterial agent is environmentally friendly; it reduces operating costs of cleaning up soil and water contaminated by grease because the technological stages of filtration, centrifugation and drying of bio-preparation can be avoided; * the grease separated from wastewater can be degraded on a ground construction which does not require extraordinary isolation of the ground bottom; * implementation of this technology enables increased efficiency and reduced prices of contaminated wastewater purification work. Development of this technology requires solving specific technological problems: - optimisation of the bacterial agent production process in order to maximise productivity and activity of bio-preparations; - optimisation of composting technology in order to maximise the rate of grease utilisation. Solving the above problems requires extensive experimental investigation and application of experimental design, mathematical modelling, optimisation and optimal control methods to reduce time and to increase the efficiency of solutions. The detailed objectives of the projects are as follow: 1) Selection and optimisation of the composition of bacterial agents; 2) Development and optimisation technology of bacterial agent production; 3) Development of wastewater cleaning technology; 4) Development and realisation of technology for cleaning pipelines polluted by grease; 5) Development and realisation of cleaning site prototype; 6) Development of composting technology for grease utilisation, including phytoremediation. Keywords: grease pollution, wastewater purification, biotechnology.
Acronym: 
DEGREAS
Project ID: 
3 726
Start date: 
01-06-2006
Project Duration: 
36months
Project costs: 
370 000.00€
Technological Area: 
Ecology
Market Area: 
General food products

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.