Abstract:

Internal circulation（IC） denitrification reactor was designed on the basis of IC anaerobic reactor，and the engineering application was investigated for the reverse osmosis concentrated water treatment. The results showed that the IC denitrification reactor exhibited a rapid start and stable running. The effluent TN ranged from 1.89 mg/L to 14.0 mg/L with an average of 4.65 mg/L when the influent TN were from 18.7 mg/L to 39.0 mg/L with an average of 26.6 mg/L，which was lower than the required 15 mg/L by Standard B of Table1 in Comprehensive Wastewater Discharge Standards for the Yellow River Basin in Shanxi Province（DB 61/224-2018）. The effluent suspended solids mass concentration was lower with an average mass concentration of 18.6 mg/L，and the effluent COD of the subsequent recirculation biofilter was 35.4 mg/L，stably controlled below 50 mg/L，which showed a perfect comprehensive treatment effect. Moreover，the IC denitrification reactor had a small footprint，simple process，and a direct water treatment cost of 1.36 yuan/m³，which had significant economic benefits.

Key words: internal circulation, denitrification reactor, reverse osmosis concentrated water

摘要：

在内循环（Internal circulation，IC）厌氧反应器结构基础上，设计了IC脱氮反应器，并研究了其在炼化反渗透浓水处理中的工程应用。结果表明，IC脱氮反应器启动快、运行稳定。在进水TN为18.7~39.0 mg/L，平均26.6 mg/L条件下，经IC脱氮反应器处理后出水TN为1.89~14.0 mg/L，平均4.65 mg/L，显著低于《陕西省黄河流域污水综合排放标准》（DB 61/224—2018）表1中B标准对于TN≤15 mg/L的排放要求；出水悬浮物质量浓度低，平均为18.6 mg/L；后续内循环曝气生物滤池出水COD平均为35.4 mg/L，可稳定控制在50 mg/L以下，综合处理效果好。同时，该设备占地面积小，工艺简单，水处理直接成本为1.36元/m³，具有显著的经济效益。

关键词: 内循环, 脱氮反应器, 反渗透浓水

CLC Number: 

• X703