ZENGXiao-lan,YINJia-hao,CHENLiang,et al.Electrochemical Process for Treatment of Agricultural Non-point Source Sewage in Dianchi Basin[J].China Water & Wastewater,2022,38(13):105-110.
Electrochemical Process for Treatment of Agricultural Non-point Source Sewage in Dianchi Basin
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第13期
Page:
105-110
Column:
Date of publication:
2022-07-01
- Keywords:
- electrochemical process; nitrogen and phosphorus removal; agricultural non-point source sewage; Dianchi basin
- Abstract:
- A set of electrochemical nitrogen and phosphorus removal system was designed, and a pilot?scale device was built in a wastewater purification plant in Dianchi basin. The removal of COD, TP, NH3-N and TN from agricultural non-point source sewage was discussed, and the effects of hydraulic retention time (HRT) and electrolyte on enhanced nitrogen removal were investigated. Under the following conditions: current intensity of 5 A, plate spacing of 7 cm, plate number of 6 pairs and HRT of 6 h, the removal efficiencies of COD, TP, NH3-N and TN were 65.9%, 79.9%, 8.1% and 6.8%, respectively. Among them, the COD and TP in effluent met the first level A criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002), and the TP in effluent even met the requirements of phosphorus discharge in Dianchi basin (less than 0.3 mg/L). However, the denitrification performance was poor. When HRT and NaCl dosage were 20 h and 3 000 mg/L, the removal efficiencies of NH3-N and TN were increased to 48.5% and 45.2%, respectively, but they still failed to meet the discharge standard. The electrochemical process had an excellent performance in the removal of organic matter and phosphorus. However, the nitrogen removal needs to be further optimized.
Last Update:
2022-07-01