In the process of wastewater biochemical treatment, the factors affecting microbial activity can be divided into two categories: matrix type and environmental type:
The matrix category includes nutrients, such as carbon-based organic compounds, namely carbon source materials, nitrogen sources, phosphorus sources and other nutrients, as well as trace elements such as iron, zinc, and manganese; in addition, they also include some toxic and harmful chemicals such as phenol It also includes some heavy metal ions such as copper, cadmium, and lead ions.
Environmental factors mainly include:
(1) Temperature. The influence of temperature on microorganisms is very extensive. Although certain types of bacteria are active in high temperature environment (50℃～70℃) and low temperature environment (-5～0℃), most of microorganisms are the most active in sewage treatment. The suitable temperature range for growth is 20-30°C. In a suitable temperature range, the physiological activity of microorganisms is vigorous, and its activity increases with the increase of temperature, and the treatment effect is better. Beyond this range, the activity of microorganisms will deteriorate, and the biological reaction process will be affected. Generally, the maximum and minimum limits for controlling the progress of the reaction are 35°C and 10°C, respectively.
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