Practical application of microorganism for pulp wastewater treatment

• Published in: Chemical engineering science 1980, Vol.35 (1), p.127-134
• Main Authors: Sawada, T., Chohji, T., Kuno, S.
• Format: Article
• Language: English
• Subjects: DNA replication; dynamic behavior; environmental conditions; macromolecule synthesis model; organic material decomposition; Pulp wastewater treatment
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/0009-2509(80)80079-0

Microorganism, which can grow in pulp wastewater, was isolated by the enrichment culture method. The microorganism was able to utilize most organic compounds, except lignin derivatives, in the pulp waste. Effects of environmental conditions, such as temperature, pH, concentration of wastewater, and others on the treatment have been studied in a batch culture. Maximal values in growth rate and in degree of utilization of organic materials with 10 to 40 % pulp wastewater were obtained at 37° and pH of 7.0. The extent of decomposition of organic materials in 10 % wastewater reached 85 to 90 %, as measured by reducing sugar content. In order to obtain optimal design, operation, and control for practical application, an equational expression which was based on an estimation of macromolecule synthesis in individual cell with different cell age, was adopted for calculation of growth and removal of nutrient in balanced and unbalanced growth states. The calculated values according to this model with several parameters showed satisfactory agreement with experimental data, such as number of cells, concentration of cell components, and concentration of nutrient in the wastewater, during the course of treatment.