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Application of a novel Mass Bio System to remove low-concentration ammonia nitrogen from water bodies

机译:新型Mass Bio系统在去除水体中低浓度氨氮中的应用

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Water pollution due to ammonia is one of the most serious problems faced by the human beings and other life forms worldwide. With the rapid development of economy, pollution of water resources by ammonium (NH _(4) ~(+) ) pollutants has increased severely. The water supply system has exceeded its capacity with regard to both quantity and quality of water. Many countries have already established a standard for strict limitation of ammonium nitrogen (NH _(4) ~(+) -N) or NH _(3) content in drinking water. In this study, a novel Mass Bio System (MBS), a suspended biologically activated carbon granular carrier cubic particle with 2–5 mm side length and a specific gravity of 1.02–1.08, was used for water treatment. In order to find a suitable method for ammonium removal from water resources, synthetic water containing NH _(4) ~(+) -N at a concentration of about 10 ppm was treated by MBS. NH _(4) ~(+) -N was nitrified to nitrate nitrogen (NO _(3) ~(?) -N) by MBS in an inner-circulated fluidized bed reactor continuously. MBS showed an efficient and stable NH _(4) ~(+) -N nitrifying performance at temperature of 20–30 °C and DO of 3–4 mg L ~(?1) . With an influent concentration of NH _(4) ~(+) -N at 10–15 mg L ~(?1) , the concentration of effluent NH _(4) ~(+) -N and nitrite nitrogen (NO _(2) ~(?) -N) was below 0.25 mg L ~(?1) , showing an average removal efficiency of above 90% within a hydraulic retention time (HRT) of 30 min. The pH value of effluent water remained at 7.2–7.3 automatically. Removal of load could reach 256.1 mg-N per (L-pellet h) and oxygen uptake rate increased to 1170.9 mg-O _(2) per (L-pellet h). The nitrifying process fits to zero-order degradation kinetics. High biomass retention was observed by scanning electron microscopy (SEM).
机译:氨造成的水污染是全世界人类和其他生命形式面临的最严重问题之一。随着经济的飞速发展,氨(NH _(4)〜(+))污染物对水资源的污染急剧增加。就水的数量和质量而言,供水系统已超出其容量。许多国家已经建立了严格限制饮用水中铵态氮(NH_(4)〜(+)-N)或NH_(3)含量的标准。在这项研究中,一种新型的Mass Bio System(MBS),一种悬浮的生物活性炭颗粒载体立方颗粒,其边长为2–5 mm,比重为1.02–1.08,被用于水处理。为了找到一种从水资源中去除铵的合适方法,用MBS处理了浓度约为10 ppm的NH_(4)〜(+)-N的合成水。在内部循环流化床反应器中,通过MBS将NH_(4)〜(+)-N硝化为硝酸盐氮(NO_(3)〜(α)-N)。 MBS在20–30°C的温度和DO为3-4 mg L〜(?1)的条件下显示出高效,稳定的NH _(4)〜(+)-N硝化性能。当进水浓度为NH _(4)〜(+)-N为10–15 mg L〜(?1)时,出水NH _(4)〜(+)-N和亚硝酸盐氮(NO _( 2)〜(η)-N)低于0.25 mg L〜(η1),表明在30分钟的水力停留时间(HRT)内平均去除效率超过90%。废水的pH值自动保持在7.2-7.3。去除负荷可达到每(L丸h)256.1 mg-N,吸氧率增加至每(L丸h)1170.9 mg-O _(2)。硝化过程适合零级降解动力学。通过扫描电子显微镜(SEM)观察到高的生物量保留。

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