Comparative technical and economic analysis of systems for liquid manure management

V.Dimova, R.Georgiev, Ch.Miteva, N.Nedelcheva

Abstract. The objective of the study is to make a comparative analysis of the most important technical and economic parameters of technological variants for cleaning, storage and treatment of liquid manure, in order to develop and explain from a theoretical and analytical point of view economical design solution of a system for manure management in a pig farm. To achieve the objective the amount of manure and urine produced in a real farm in Bulgaria with a capacity of 3704 pigs has been determined, a detailed technical and technological project of the facility for storage of liquid manure (“lagoon” type) has been developed and the technological processes for existing farm system for manure separation have been examined and detailed. The total built-up areas and volumes for both variants of the system for managing liquid manure and the initial investment costs for constructing and equipping with equipment have been defined, as on this basis a comparative technical and economic analysis has been made and a preferred variant for the practic has been proposed. It has been found out that the variant with a liquid manure separating system is more economical than the variant with a semi-buried scrape lagoon by the volume and planning parameters: by total built-up area – by 7,4% and by total built-up volume – 2,1 times, which brings less pollution to the environment. The variant with a lagoon is more economical than the one with a liquid manure separating system by the following parameters: by total construction cost for building the manure storage facilities – 2,2 times, by total cost of the manure management equipment – 2,6 times, by total investment costs for constructing and equipping with manure management equipment for the manure storage facilities – 2,4 times.