A case study on piggery farm scale liquid manure pit recharge system

Abstract

Recently, several swine farmers are trying to install a “Liquid Manure Pit Recharge System (LMPRS)” to reduce odors, but many farmers are suffering from a lack of related information. This research was carried out to provide information to pig farmers who want to install a LMPRS through field surveys of the LMPRS applied to several swine farmers, investigating characteristics of installation and operation, and classifying types by process. The field survey of five farms found common operation methods such as initial stabilization period (180 days), retention period in the aeration tank (30 days), temperature in the aeration tank (30°C), and mixed liquer suspended solid (MLSS) (3,000 ppm), and based on the analysis of the process flow of each farm, it was possible to classify as type 1 (periodic addition of microorganisms, no solid-liquid separation), type 2 (periodic addition of microorganisms, conduct solid-liquid separation), type 3 (no microorganisms addition, conduct solid-liquid separation), and type 3-1 (no microorganisms addition, conduct the 1st, 2nd solid-liquid separation) based on whether microorganism was continuously added or not and whether using solid-liquid separator. It is believed that this research can be used as a basic data to help farmers who wish to install LMPRS by presenting common operation and management methods and types by process.