XUEGang,HEYue-ling,WANGXiao-nuan,et al.Pilot Study of Sulfur-driven Autotrophic Denitrification for Advanced Nitrogen Removal in Secondary Effluent of Dyeing Wastewater[J].China Water & Wastewater,2022,38(13):15-21.
印染废水的硫自养反硝化深度脱氮中试研究
- Title:
- Pilot Study of Sulfur-driven Autotrophic Denitrification for Advanced Nitrogen Removal in Secondary Effluent of Dyeing Wastewater
- Keywords:
- dyeing wastewater; sulfur-driven autotrophic denitrification; filter; advanced nitrogen removal
- 摘要:
- 针对异养反硝化脱氮外加有机碳源成本高的问题，采用硫自养反硝化滤池对印染废水的生化处理出水进行深度脱氮中试。在连续84 d 运行期内，通过逐步提高中试装置进水流量，在水力负荷为1.27 m3/（m2·h）、进水氮负荷为0.52 kg/（m3·d）的条件下，获得了74.1%的最佳TN去除率；同时，微生物的同化作用使其对NH4+-N具备一定的去除能力。处理后废水pH、碱度及ORP降低，表明还原性S0在自养反硝化菌的作用下参与了NO3--N的还原过程。与异养反硝化相比，硫自养反硝化具有成本及污泥产量低的特点，且不存在外加碳源转化为温室气体CO2排放问题。
- Abstract:
- The external carbon source was required for nitrogen removal by heterotrophic denitrification, contributing a majority of operational cost in wastewater treatment. So, the pilot study of sulfur-driven autotrophic denitrification filter with no external carbon source was carried out. During a continuous 84-day operating period, the optimal TN removal of 74.1% was achieved at the hydraulic loading of 1.27 m3/(m2·h) and nitrogen loading rate of 0.52 kg/(m3·d). A certain amount of NH4+-N removal was attributable to microbial assimilation. The pH, alkalinity and ORP decreased after treatment, showing that the reductive S0 participated in the NO3--N reduction by autotrophic denitrifying bacteria. Compared to heterotrophic denitrification, sulfur?driven autotrophic denitrification has lower operational cost and biomass yield, along with no emission of CO2 greenhouse gas converted from external carbon source.
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