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首页> 外文会议>Second International Conference on Wetlands amp; Remediation, Sep 5-6, 2001, Burlington, Vermont >A FULL-SCALE SYSTEM WITH WETLANDS FOR SLAUGHTERHOUSE WASTEWATER TREATMENT
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A FULL-SCALE SYSTEM WITH WETLANDS FOR SLAUGHTERHOUSE WASTEWATER TREATMENT

机译：带湿地的大型系统，用于屠宰场废水处理

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The performance of a full-scale system with wetlands for abattoir effluent treatment in the State of Hidalgo, Mexico, was evaluated. The treatment system consisted of a primary sedimentation tank, an anaerobic lagoon, and a constructed wetland, in series. The wetland was backfilled with gravel and planted with cattail and reed. It was found that the wetland accounted for almost 30% of the organic matter removal. In general, the treatment system achieved satisfactory overall pollutant removals, but the final effluent could not meet the Mexican environmental regulations (fecal coliform counts, BOD_5 and total suspended solids). Overall removals were 91%, 89% and 85% for BOD_5, COD and TSS respectively. However, BOD_5 in the final effluent (137 mg/L) was higher than the maximum level of 30 mg/L allowed by the regulatory agency. Organic nitrogen removals were approximately 80%, but the nitrogen persisted in oxidation state -3 as ammonia nitrogen, whose removal was only 9% in the wetland stage. Phosphorus removal was null in the average; on occasion the phosphorus concentration in the treated effluent was higher than that of the influent. Coliform reductions in the overall system were high, in the order of 5 logs average whereas the coliform removal in the wetland was between 2 to 3.5 logs. The treatment system was also effective in removing pathogens (Vibrio cholerae, Salmonella and Shigella). Further lab tests with the treated effluent suggest that post-treatment in a sand filter stage followed by disinfection with NaOCl could help in meeting the Mexican discharge regulations, particularly the coliforms and the total BOD_5 criteria.
机译：评估了在墨西哥伊达尔戈州使用湿地进行屠宰场废水处理的完整系统的性能。该处理系统由一个串联的主要沉淀池，一个厌氧泻湖和一个人工湿地组成。湿地被砾石回填，并种植有香蒲和芦苇。发现湿地几乎占去除有机物的30％。总的来说，该处理系统可实现令人满意的总体污染物去除，但是最终的出水不能满足墨西哥的环境法规（大肠菌群计数，BOD_5和总悬浮固体）。 BOD_5，COD和TSS的总去除率分别为91％，89％和85％。但是，最终废水中的BOD_5（137 mg / L）高于监管机构允许的最高水平30 mg / L。有机氮的去除率约为80％，但氮以氨态氮的形式持续处于氧化态-3，在湿地阶段氮的去除率仅为9％。平均除磷率是零。有时，处理后的废水中的磷浓度高于进水。整个系统中大肠菌群的减少量很高，平均约为5个对数，而湿地中大肠菌的去除量介于2至3.5个对数之间。该处理系统还可以有效去除病原体（霍乱弧菌，沙门氏菌和志贺氏菌）。对处理过的废水进行进一步的实验室测试表明，在砂滤阶段进行后处理再用NaOCl消毒可以帮助满足墨西哥的排放法规，特别是大肠菌群和BOD_5的总标准。

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