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焦化废水生化出水总氰构成及去除特性的研究
孙贤波,钱飞跃
作者单位E-mail
孙贤波 华东理工大学 xbsun@ecust.edu.cn 
钱飞跃 华东理工大学  
摘要:
为满足日趋严格的排放标准要求,对焦化废水生化出水中总氰的构成进行分析是十分必要的。本文通过测定某焦化厂生化出水中氰化物和主要金属离子的浓度后发现,铁氰络合物对总氰指标的贡献率超过90%。该类化合物在光解、微生物降解和混凝沉淀过程中的去除特性表明,铁氰络合物虽见光易分解,但在缺乏光照的生化反应器中,微生物对其的去除作用主要体现为吸附而非降解。目前,提高生化除氰效率的主要途径是尽量延长水力停留时间和采用固液传质效率更高的反应器。另外,酸性、好氧条件和高分子助凝剂的使用可显著增强化学沉淀法的除氰能力。
关键词:  焦化废水生化出水  铁氰络合物  光解  生物降解  化学沉淀法
DOI:
分类号:
基金项目:
Study on the composition and removal characteristics of total cyanide in the bio-treated coking wastewater
Sun Xianbo,Qian Feiyue
Abstract:
It was necessary to study on the composition of total cyanide in the coking wastewater after biological treatment in order to meet the new discharge limits. In the paper, cyanide and metal element in the bio-treated wastewater sampled from the coal coking factory in Shanghai were analyzed firstly, which indicated that iron-cyanide complexes accounted for more than 90% of total cyanide. Then removal characteristics of this compound in photolysis, biological degradation and chemical precipitation processes were investigated. Results showed that iron-cyanide complexes are removed by microorganism through adsorption more than degradation in the dark biological reactor due to their thermodynamic stability, even if which can decompose fast under the illumination condition. Now common ways to enhance total cyanide removal ability of biological treatment systems are increasing the HRT and improving the solid-liquid mass transfer efficiency of reactors. In addition, low pH and high pE condition with dosing the FeSO4 with PAC have the positive effect for the chemical precipitation method.
Key words:  bio-treated coking wastewater  iron-cyanide complexes  photolysis  biological degradation  chemical precipitation

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