Environmental impacts of nitrogenous compounds in wastewaters discharged into aquatic environments are presented. Technology for removal of nitrogen from wastewaters is reviewed. Emphasis is given to the single sludge systems for nitrogen removal and their performance in different countries. Nitrification and denitrification kinetics, as well as state-of-the-art of the mathematical models for these processes are described. A single sludge nitrification-denitrification system with intermittent aeration combined with simultaneous precipitation of phosphorus with ferrous sulphate was tested. Experiments were performed in a technical scale plant at the Suomenoja Research Station, Espoo, and the obtained results are given. A dynamic mathematical model was proposed for this process. The model consists of differential equations, written for ammonia and nitrate nitrogen, BOD, alkalinity, dissolved oxygen and heterotrophic and nitrifying organisms. A computer program for solving these differential equations was developed and computer simulations were performed to show the affects of various variables on the performance of the process. It has been demonstrated that the computer program is a useful tool for determining the operational strategies for the process. In addition, technical considerations for the process are given.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||132|
|Publication status||Published - 1982|
|MoE publication type||D4 Published development or research report or study|
|Series||Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports|
Gromiec, M., Valve, M., & Liponkoski, M. (1982). Nutrients removal from wastewaters by the single sludge systems. VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 120