文章摘要
无机碳源对生物絮团降氮及沉降性能的影响研究
Effect of inorganic carbon source on nitrogen reduction and sedimentation performance of bioflocs
投稿时间:2019-04-02  修订日期:2019-05-21
DOI:
中文关键词: 生物絮团反应器  无机碳源  降氮  生物量  沉降性能
英文关键词: Biofloc reactor  Inorganic carbon  Nitrogen reduction  Sedimentation performance
基金项目:湖北省农业科技创新行动项目;现代农业产业技术体系建设专项资金(CARS-45)。
作者单位E-mail
缑敬伟 华中农业大学水产学院 gjw_hzau@163.com 
王晓宁 华中农业大学水产学院  
杜红春 华中农业大学水产学院  
陈杰玉 华中农业大学水产学院  
何绪刚 华中农业大学 水产学院 gjw_hzau@163.com 
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中文摘要:
      利用异位生物絮团反应器,分别在有机碳源存在(第Ⅰ阶段,持续21 d)和有机碳源缺失(第Ⅱ阶段,持续21 d)两个阶段,比较研究了无机碳源(NaHCO3)浓度为0.0 g/L(对照组),0.5 g/L,1.0 g/L和1.5 g/L的模拟养殖废水对反应器生物絮团降氮及沉降性能的影响。结果显示,第Ⅰ阶段对照组出水氨氮浓度显著高于其他处理组(P < 0.05),但总体上呈先下降后稳定的趋势,各组亚硝态氮和硝态氮有均少量积累;生物絮团生物量及沉降速度对照组显著低于处理组(P < 0.05),处理组之间差异不显著。第Ⅱ阶段各组出水的氨氮、亚硝态氮浓度无显著差异(P > 0.05),对照组硝态氮浓度高于各处理组,氨氮浓度迅速下降;此阶段生物絮团的生物量、沉降速度有所下降,NaHCO3浓度为1.0 g/L处理组表现出较好的沉降效果;粒径分布也趋向均匀。整个实验阶段,不同浓度无机碳源处理条件下,氨氮的去除效率均达到97.8%以上,亚硝态氮无显著积累,处理组生物絮团沉降速度和生物量显著高于对照组(P < 0.05)。结果表明,添加无机碳源可提高生物絮团降氮性能,增强其沉降速度;移除有机碳源后,生物絮团反应器可维持氨氮去除能力,但引起硝态氮积累,生物絮团生物量减少;有机碳源缺失时,无机碳源(≥0.5 g/L)有助于生物絮团反应器保持其氨氮去除能力。
英文摘要:
      The ectopic biofloc reactor was used to compare the simulated carbon sources (NaHCO3) concentration of 0.0 g/L (control group), 0.5 g/L, 1.0 g/L and 1.5 g/L of simulated aquaculture wastewater which effect the nitrogen reduction and sedimentation performance of the bioflocs in two stages: organic carbon source exist (stage I for 21 d) and organic carbon source loss (stage II for 21 d). The results showed that the effluent ammonia nitrogen concentration in the first-stage control group was significantly higher than that in the other treatment groups (P < 0.05), but generally decreased first and then stabilized. The nitrite nitrogen and nitrate nitrogen in each group accumulated a small amount; the biofloc biomass and sedimentation rate of the control group were significantly lower than the treatment groups (P < 0.05), and the difference between the treatment groups was not significant. There was no significant difference in the concentration of ammonia nitrogen and nitrite nitrogen in the effluent of each group in stage II (P > 0.05). The concentration of nitrate nitrogen in the control group was higher than that in treatment groups, and the concentration of ammonia nitrogen decreased rapidly. At this stage, the biomass and sedimentation rate of the bioflocs decreased, and the 1.0 g/L NaHCO3 treatment group showed better sedimentation effect; the particle size distribution also tends to be uniform. During the whole experimental period, the removal efficiency of ammonia nitrogen reached 97.8% and the nitrite nitrogen did not accumulate significantly under different concentrations of inorganic carbon source. The sedimentation rate and biomass of bioflocs in the treatment groups were significantly higher than those in the control group (P < 0.05). The results show that the addition of inorganic carbon source can improve the nitrogen reduction performance of bioflocs and enhance its sedimentation rate. After removing the organic carbon source, the biofloc reactor can maintain the ammonia nitrogen removal capacity, but caused nitrate nitrogen accumulation, biofloc organisms. The amount is reduced when the organic carbon source was missing, the inorganic carbon source (≥0.5 g/L) helps the biofloc reactor to maintain its ammonia nitrogen removal capacity.
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