焦化废水在厌氧反硝化产甲烷体系中降解动力学特征

接种成熟厌氧反硝化产甲烷颗粒污泥，以焦化废水特征污染物苯酚、喹啉、吡啶和吲哚为碳源，研究了不同C/N下，反硝化产甲烷体系有机物降解特征。结果表明，焦化废水为碳源，可以发生反硝化产甲烷反应；在C/N为3、6时，只发生反硝化反应；在C/N为12、50时，同时发生反硝化产甲烷反应；体系中反硝化反应优先于产甲烷反应进行；NOx--N降解过程出现NO2--N积累，C/N比增加，NO2--N最高积累量降低，产甲烷活性恢复时间缩短；反硝化比耗碳速率大于产甲烷比耗碳速率，同时反硝化产甲烷体系有机物去除效率高于单一厌氧产甲烷体系，反硝化反应有助于保持pH值稳定，降低ORP，从而促进产甲烷菌的繁殖。

Degradation kinetics characteristics of coking wastewater in anaerobic simultaneous denitrification and methanogenesis

Inoculated mature granular sludge and coking wastewater (carbon source) were used to study the characteristics of organics degradation in an anaerobic, simultaneous denitrification and methanogenesis system under different C/Ns. Test results showed that:1) Pollutants in coking wastewater could be effectively removed using anaerobic simultaneous denitrification and methanogenesis. 2) When the C/N ratio was 3 or 6,only denitrification occurred, without any methane production in the reaction. Anaerobic simultaneous denitrification and methanogenesis was observed when the C/N ratio was 12 or 50. 3) Denitrification had priority in this system, and the excess carbon was degraded by methanogenesis after denitrification was completed. Accumulation of NO2--N was observed during denitrification. The maximum accumulation rate of NO2-N, and the methanogenic activity recovery time, were both reduced when the C/N ratio increased. 4) The rate of carbon consumption during denitrification was greater than during methanogenesis in this system. Denitrification helped stabilize the pH, lower the ORP, and promote methane bacteria breeding;so the efficiency of organics removal with the anaerobic simultaneous methanogenesis and denitrification system was higher than with a single system for anaerobic methanogenesis.