Wastewater Ammonia Removal Treatment System-AIRTECHS_Specializing in waste gas treatment engineering

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Wastewater Ammonia Removal Treatment System

Release time:

2022-04-28

The ammonia-nitrogen treatment system integrates multiple technologies, including ammonia stripping and absorption tower purification, to treat wastewater containing ammonia-nitrogen at varying concentrations. It can reduce the ammonia-nitrogen concentration in wastewater exceeding 10,000 mg/L to meet discharge standards. After treatment, the ammonia-nitrogen concentration is reduced to below 15 mg/L. This system combines simplicity of operation, low investment, mature technology, convenient control, and zero secondary pollution—a combination that makes it highly effective. Traditionally, ammonia gas released during ammonia-nitrogen stripping would enter the atmosphere along with air, still posing a risk of secondary pollution. To address this issue, our company has added an absorption tower after the ammonia-stripping tower, ensuring that the air discharged into the atmosphere is thoroughly purified and free from any pollutants. Design Principle Explanation: In wastewater, ammonia-nitrogen primarily exists in two forms: ammonium ions (NH4+) and free ammonia (NH3). The equilibrium relationship between these two forms is as follows: NH3 + H2O ⇌ NH4+ + OH-. This equilibrium is influenced by pH value. When the pH is high, the equilibrium shifts to the left, increasing the proportion of free ammonia. At room temperature, when the pH is around 7, most of the ammonia-nitrogen exists in the form of ammonium ions; however, when the pH reaches approximately 11, free ammonia accounts for roughly 98%. Free ammonia readily escapes from water, and if the wastewater is aerated, this process is further enhanced, facilitating the release of ammonia from the water.

Design Principle Explanation: In wastewater, ammonia nitrogen primarily exists in two forms: ammonium ions (NH4+) and free ammonia (NH3). The equilibrium relationship is as follows: NH3 + H2O ⇌ NH4+ + OH-. This equilibrium is influenced by the pH value. When the pH is high, the equilibrium shifts to the left, increasing the proportion of free ammonia. At room temperature, when the pH is around 7, most of the ammonia nitrogen exists in the form of ammonium ions; however, at a pH of about 11, free ammonia accounts for roughly 98%. Free ammonia readily escapes from water, and if aeration is applied, it can further promote the release of ammonia from the water. Among these factors, pH is crucial for achieving optimal results. The dissociation rates (%) of ammonia nitrogen at different pH levels and temperatures are as follows: | pH | 20℃ | 30℃ | 35℃ | |----|-----|-----|-----| | 9.0 | 25 | 50 | 58 | | 9.5 | 60 | 80 | 83 | | 10.0 | 80 | 90 | 93 | | 11.0 | 98 | 98 | 98 |

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