HE Yang,YUAN Yu-liang,WANG Jin-feng,et al.An Operation Case of Biological Denitrification Process for Ultra-high Total Nitrogen Wastewater[J].China Water & Wastewater,2021,37(20 20):116-120.
An Operation Case of Biological Denitrification Process for Ultra-high Total Nitrogen Wastewater
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
20 20
Page:
116-120
Column:
Date of publication:
2021-10-17
- Keywords:
- high concentration of total nitrogen; stainless steel mixed acid wastewater; integrative biological reactor (IBR); biological denitrification process
- Abstract:
- The IBR denitrification process used in the mixed acid wastewater treatment project of a cold rolling stainless steel factory has the characteristics of pre-sedimentation tank and high sludge return rate. The MLVSS was maintained above 10 000 mg/L, and the total nitrogen load of sludge in the anoxic section was 10-30 mgTN/(gMLVSS·d). It could reduce the total nitrogen of wastewater (nitrate nitrogen ratio≥98%) from 400-1 200 mg/L to less than 15 mg/L, which achieved discharge standard in one step, and the total nitrogen removal rate was ≥99.0%. There were obvious differences between the processing of ultra-high nitrogen wastewater and low concentration nitrogen wastewater, such as methanol dosing mode, ORP and DO in the system. The effect of biochemical exothermic should also be considered in the process design. There were still some shortcomings in the process, such as scaling, short flow, sludge turning, etc., which could be mitigated by operation management to guarantee that the standard discharge.
Last Update:
2021-10-17