Hygienization assessment during heap co-composting of Turkey manure and olive mill pomace

Authors : Rachid ABOUTAYEB, Soufiane EL-MRİNİ, Abdeljalil ZOUHRİ, Omar IDRİSSİ, Khalid AZİM

Pages : 332-342

Doi:10.18393/ejss.972062

View : 13 | Download : 8

Publication Date : 2021-10-01

Article Type : Research Paper

Abstract :This study aimed to investigate the co-composting time effectiveness as well as the effect of the initial Carbon/Nitrogen ratio insert ignore into journalissuearticles values(C/N);i variation on the hygienization of olive pomace and turkey manure. Six different heaps, at 3 levels of insert ignore into journalissuearticles values(C/N);i ratios: 20, 22 and 28, were installed and monitored during 6 months and assessed at three steps: At the beginning, the end of thermophilic-phase and the end of curing-phase. The microbial monitoring concerned 5 microbial pathogens contents, used as hygiene microbial indicators, namely: Sulphite-Reducing Anaerobes insert ignore into journalissuearticles values(SRA);, Escherichia Coli insert ignore into journalissuearticles values(E. Coli);, Total Aerobic Mesophilic Flora insert ignore into journalissuearticles values(TAMF);, Staphylococci, and Salmonella spp. Initially, the mixtures showed high TAMF and Staphylococci loads. Meanwhile, SRA and E. coli populations were relatively low and Salmonella spp. was not detected. The microbial assessment showed a significant effect of composting time on the reduction of pathogens load, except for SRA where its population has increased significantly, while the insert ignore into journalissuearticles values(C/N);i had a non-significant effect on pathogen content of the end-product. The final values expressed as colony-forming unit per gram insert ignore into journalissuearticles values(CFU g-1);, were as follow: Sulfite-reducing Anaerobes insert ignore into journalissuearticles values(≤3.1 x 103 CFU g-1);, E. Coli germ used as an indicator of faecal contamination insert ignore into journalissuearticles values(<4 x 101 CFU g-1);, Total aerobic mesophilic flora insert ignore into journalissuearticles values(≤1.4 x 106 CFU g-1);, Staphylococci insert ignore into journalissuearticles values(<10 CFU g-1); and non-detection of Salmonella spp. Finally, the seed germination tests were carried out on three different seeds: lentils insert ignore into journalissuearticles values(Lens culinaris);, barley insert ignore into journalissuearticles values(Hordeum vulgare); and durum wheat insert ignore into journalissuearticles values(Triticum turgidum); showed that the use of the compost extract is favourable for seed germination with germination index insert ignore into journalissuearticles values(GI%); values exceeding 85%. These results confirm the non-phytotoxicity and maturity of the composts.
Keywords : Sanitation, pathogens, poultry manure, microbial hazard, germination index, olive by products