基于盐酸羟胺回收的唑类离子盐生产废水的高效处理

Efficient treatment process of azole ion salt production wastewater based on hydroxylamine recovery

针对唑类离子盐生产废水高含氮、可生化降解性差、且具有高价值化合物残留等特点,开发了基于盐酸羟胺回收的高效处理工艺,处理实际的唑类离子盐生产废水。整个集成工艺分为3个核心部分:盐酸羟胺回收、非均相Fenton催化氧化、膜生物反应器。研究明确了回收盐酸羟胺的最佳反应时间、反应pH和原料配比;开发了两类非均相Fenton催化剂(Fe2O3和Fe3O4)并明确了催化剂的最佳投加量(10 g/L)和H2O2的最佳投加比例(CH2O2/CCOD=1∶1);从活性污泥中富集分离出耐盐或嗜盐的唑类离子盐特异降解菌。对盐度的耐受浓度最高可达100 g/L;对唑类离子盐的降解率可达71.2%。以上研究成果可以为唑类离子盐生产废水的处理提供指导。

An efficient treatment process based on the recovery of hydroxylamine hydrochloride was developed to treat the azole ion salt wastewater according to the high nitrogen content,poor biodegradability and high value compound residues.The combined process is divided into three core parts:hydroxylamine hydrochloride recovery,heterogeneous Fenton catalytic oxidation and membrane bioreactor.The study clarified the optimal reaction time,reaction pH and raw material ratio for the recovery of hydroxylamine hydrochloride.Two types of heterogeneous Fenton catalysts(Fe2O3 and Fe3O4)were developed and the optimal dosage of catalyst(10 g/L).The optimal dosing ratio of H 2O 2(C H 2O 2/C COD=1∶1).Enrichment and separation of salt-tolerant or halophilic azole ion-specific degrading bacteria from activated sludge.The salinity tolerance concentration can reach up to 100 g/L;the degradation rate of azole ionic salt can reach 71.2%.The above research results can provide guidance for the treatment of azole ion salt production wastewater.