吹脱池处理畜禽粪污厌氧消化废水中氨氮的研究

Research on Treatment of Nitrogen in Anaerobically Digested Swine Wastewater by Air Stripping Pool

对畜禽养殖粪污厌氧消化废水进行吹脱处理实验,分别探讨了初始p H、温度、初始氨氮浓度、水位深度、单位时间（每小时）气水比、吹脱时间、沉淀物的存在等因素对氨氮去除效果的影响。结果表明：适当提高初始p H、温度、初始氨氮浓度、单位时间（每小时）气水比、吹脱时间,氨氮去除效果均能有效提高;当p H=11,温度为30℃,单位时间（每小时）气液比为240∶1,吹脱时间为24 h时,氨氮去除率可达99.78%,氨氮浓度可从653 mg/L降到1.43 mg/L;结合畜禽养殖行业实际情况,综合考虑处理效果、能耗等,取p H为10.5~12.0,曝气吹脱时间为48 h,单位时间（每小时）气液比为240∶1~360∶1,水温为20~30℃,氨氮去除率可达87.10%以上。

Air stripping was used to treat anaerobically digested swine wastewater, and then the influence of the pH, the temperature, the initial concentration of ammonia nitrogen, the water level ,the ratios of air to liquid in unit time（per hour）, the blow-off time and the existence of something deposited were investigated respectively. Results turn out that the nitrogen removal efficiency increases when the water level is reduced, or Something deposited were removalled, or any one of these＇rest factors is increased such as pH, temperature, initial concentration of ammonia nitrogen, air-liquid ratio in unit time（per hour） and blow-off time; Under the conditions that pH value is I I, temperature is 30 ℃, air-liquid volume ratio in unit time（per hour） is 240 ： 1, and blow-off time is 24 hour, the ammonia nitrogen removal rate can reach 99.78 %, and ammonia nitrogen concentration reduce from 653 mg/L to 1.43 mg/L; Adjusting pH to the range of 10.5-12.0, air-liquid ratio in unit time（per hour） to the range of 240 ： 1-360 ： l, temperature to the range of 20-30 ℃, and blow-offtime is 48hour,the ammonia nitrogen removal efficiency can reached to over 87.10 %.