At NINGBO INNO PHARMCHEM CO.,LTD., our expertise lies in advancing environmental treatment technologies. This article delves into denitrification, the crucial final step in biological nitrogen removal, where nitrates are converted into harmless nitrogen gas. Understanding the intricacies of the denitrification process factors is key to optimizing nitrogen removal in various water treatment scenarios, including those involving river wetlands and specialized wastewater treatment applications.

Denitrification is an anaerobic or anoxic process performed by facultative anaerobic bacteria. Unlike nitrification, which requires oxygen, denitrification thrives in its absence. For optimal results, dissolved oxygen levels must be maintained below 0.2mg/L to ensure that the bacteria utilize nitrate as their electron acceptor instead of oxygen. The process typically involves two biochemical steps: the conversion of nitrate (NO3-) to nitrite (NO2-), followed by the reduction of nitrite to nitrogen gas (N2). The suitable temperature range for denitrification is generally slightly warmer than nitrification, typically between 35-45°C. The pH preference for these bacteria is also slightly more acidic, ranging from 6.5 to 7.5.

A critical requirement for successful denitrification is the presence of a readily available carbon source. These bacteria use organic matter as their energy and carbon source to reduce nitrates. Without sufficient carbon, the process will be slow or cease altogether. The carbon-to-nitrogen ratio is a crucial parameter; theoretically, about 2.86g of biochemical oxygen demand (BOD5) is needed to convert 1g of nitrate nitrogen into nitrogen gas. Therefore, supplementing with external carbon sources is often necessary in low-organic-content wastewaters. The efficiency of denitrification can also be affected by the presence of toxic substances and the overall redox potential of the system, which should ideally be maintained between -50 to -110mV.

Mastering the biological denitrification process is essential for effective nitrogen management. By meticulously controlling the denitrification process factors such as dissolved oxygen, temperature, pH, and carbon source availability, treatment plants can achieve significant reductions in nitrate levels. This is particularly important for applications like wetland denitrification filling and advanced wastewater treatment technology aiming to meet stringent environmental regulations. NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing solutions and insights that support the efficient and effective removal of nitrogen from our water systems, contributing to healthier aquatic environments.