Controlled Microbial Conversion of Poultry Waste into a High Protein Feedstuff

摘要

This report describes technically feasible one- and two-stage processes for aerobic conversion of poultry manure into high protein feedstuff. These processes increase the efficiency of animal production and minimize the amount of waste matter released to the atmosphere. The two-stage continuous aerobic process begins with degradation of uric acid and release of ammonium ion and continues with the addition of carbon in the form of molasses or glucose to obtain a carbon to nitrogen ratio suitable for microbial proliferation. The product consists of a nearly pure culture of Pseudomonas fluorescens which is essentially free of common pathogenic organisms. The single-stage process reduces operational complexity and offers a potential cost reduction by eliminating the second stage by using a mutant of P. fluorescens. This mutant degrades uric acid in the presence of glucose and ammonium ion. A single-stage system operates at a pH of about 7.5 without pH control; reduces start-up time; retains nitrogen content; and possibly improves culture stability. A detailed preliminary analysis of process economics indicates conditions under which the two-stage process is economically attractive. Economic feasibility of the single-stage process awaits nutritional trials of the product.