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首页> 外文期刊>Journal of Environmental Science and Health >Simultaneous C and N removal from saline salmon effluents in filter reactors comprising anoxic-anaerobic-aerobic processes: Effect of recycle ratio
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Simultaneous C and N removal from saline salmon effluents in filter reactors comprising anoxic-anaerobic-aerobic processes: Effect of recycle ratio

机译：在包括缺氧-厌氧-好氧工艺的过滤器反应器中同时从盐水三文鱼中去除碳和氮：循环比的影响

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Salmon processing generates saline effluents with high protein load. To treat these effluents, three compact tubular filter reactors were installed and an integrated anoxic/anaerobic/aerobic process was developed with recycling flow from the reactor's exit to the inlet stream in order to save organic matter (OM) for denitrification. The reactors were aerated in the upper section with recycle ratios (RR) of 0,2, and 10, respectively, at 30℃. A tubular reactor behave as a plug flow reactor when RR = 0, and as a mixed flow reactor when recycle increases, thus, different RR values were used to evaluate how it affects the product distribution and the global performance. Diluted salmon process effluent was prepared as substrate. Using loads of 1.0 kg COD m~(-3)d~(-1) and 0.15 kg total Kjeldahl nitrogen (TKN) m~(-3)d~(-1) at HRT of 2 d, 100% removal efficiencies for nitrite and nitrate were achieved in the anoxic-denitrifying section without effect of the dissolved oxygen in the recycled flow on denitrification. Removals ＞98% for total organic carbon (TOC) was achieved in the three reactors. The RR had no effect on the TOC removal; nevertheless a higher efficiency in total nitrogen removal in the reactor with the highest recycle ratio was observed: 94.3% for RR = 10 and 46.6% for RR = 2. Results showed that the proposed layout with an alternative distribution in a compact reactor can efficiently treat high organic carbon and nitrogen concentrations from a saline fish effluent with OM savings in denitrification.
机译：鲑鱼加工会产生高蛋白负荷的盐水。为了处理这些废水，安装了三个紧凑的管状过滤反应器，并开发了一个集成的缺氧/厌氧/好氧工艺，利用从反应器出口到进口流的再循环流，以节省有机物（OM）进行反硝化。反应器在30℃的上部充气，循环比（RR）分别为0.2和10。当RR = 0时，管式反应器起活塞流反应器的作用，当再循环率增加时，管式反应器起混合流反应器的作用，因此，使用不同的RR值来评估其如何影响产品分布和整体性能。制备鲑鱼稀释液作为底物。在2 d的HRT下使用1.0 kg COD m〜（-3）d〜（-1）和0.15 kg总凯氏氮（TKN）m〜（-3）d〜（-1）的负载，去除率100％在缺氧-脱氮段获得了亚硝酸盐和硝酸盐，而循环流中的溶解氧对反硝化没有影响。在三个反应器中，总有机碳（TOC）的去除率＞ 98％。 RR对TOC的去除没有影响；但是，在最高循环率的反应器中，总氮去除效率更高：RR = 10时为94.3％，RR = 2时为46.6％。结果表明，在紧凑型反应器中采用替代分布的拟议布局可以有效地处理盐水鱼排泄物中有机碳和氮的浓度很高，反硝化节省了有机肥。

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