Characteristics of bacterial populations responsible for uptake of amino acids in activated sludge acclimated to peptone Available to Purchase

Amino acids (AAs) are produced from the hydrolysis of proteins, which are the major biodegradable organic compounds in municipal sewage. The characteristics of bacterial populations responsible for the assimilation of thirteen AAs into activated sludge (AS) acclimated to peptone are investigated. The results are as follows. (1) The bacterial populations responsible for the uptake of AAs were partly aggregated in AS flocs. (2) The amounts of the bacterial populations responsible for the uptake of leucine, valine, isoleucine, histidine, threonine, lysine and glycine are limited in AS acclimated to peptone. (3) The bacterial populations responsible for the uptake of phenylalanine, leucine and lysine were different. (4) The amounts of bacterial populations responsible for the uptake of aspartate, arginine, alanine, glutamate and phenylalanine are not limited. (5) The functions of the assimilation of these AAs were induced in many bacterial cells as a result of the BOD determination methods applied to these pure AAs.