LUOFeng,SHENGDe-yang,ZHANGZhong-xiang,et al.Pilot?scale Study on the Removal of Ammonia Nitrogen from Micro-polluted Water by Bio-contact Oxidation Process[J].China Water & Wastewater,2022,38(20):109-115.
Pilot?scale Study on the Removal of Ammonia Nitrogen from Micro-polluted Water by Bio-contact Oxidation Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第20期
Page:
109-115
Column:
Date of publication:
2022-10-17
- Abstract:
- A pilot study on the treatment of micro-polluted river water by bio-contact oxidation process with braided suspended filler was carried out. The results showed that under the condition of natural biofilm formation, the start-up process of pilot-scale plant was completed within 21 days by means of closed aeration and gradually shortening the residence time with the ammonia nitrogen removal rate of 94.5%. The filler surface was rich in biophase and the appearance was fluffy and dispersed without agglomerate. In the stable period, the daily average influent ammonia nitrogen was 6.40-7.74 mg/L, the ammonia nitrogen removal amount was 4.63-5.42 mg/L with average of 5.0 mg/L, and the nitrification load reached 0.17-0.20 kgN/(m3·d). The ammonia nitrogen removal efficiency of different sections first increased and then decreased slightly with the flow. The average nitrification loads of the front, middle and posterior sections were 0.12, 0.26, 0.21 kgN/(m3·d) respectively, up to 0.31 kgN/(m3·d). The ammonia nitrogen removal rate decreased from 90.3% to 70.1%, while the hydraulic load increased from 15.3 m3/(m2·d) to 25.2 m3/(m2·d), and recovered to 95.9% after 46 h operation. The ammonia nitrogen removal amount decreased from 4.89 mg/L to 3.30 mg/L when the influent ammonia nitrogen concentration increased from 5.47 mg/L to 8.0 mg/L, and recovered to 4.88 mg/L after 39 h operation. The bio-contact oxidation method with braided suspended filler has the advantages of simple and fast start-up, stable ammonia nitrogen removal efficiency and good adaptability to the impact of hydraulic and ammonia nitrogen load, which can provide reference to the remediation of micro-polluted water body or the pretreatment of micro-polluted source water.
Last Update:
2022-10-17