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首页> 外文期刊>Journal of Environmental Science and Health >Evaluating coagulation pretreatment on poultry processing wastewater for dissolved air flotation
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Evaluating coagulation pretreatment on poultry processing wastewater for dissolved air flotation

机译：家禽加工废水中用于气浮的混凝预处理效果评估

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摘要

Eleven metal coagulants and one polyelectrolyte were assessed for their suitability in assisting a dissolved air flotation (DAF) system aimed at treating poultry processing wastewater. Preliminary jar tests determined that a combination of 800 mg/L of FeCl_3 (ferric chloride) and 900 mg/L of Floccin 1115 would provide the best treatment by removing at least 98% of the total suspended solids (TSS) and 97% of the volatile suspended solids (VSS), while providing a 97% increase in water clarity. Final flotation tests suggested that the flocculated particles could be carried to the surface with 40% recycle ratio of the DAF. The resulting supernatant indicated 94.7% increase in clarity (± 1.4%), 97.3% reduction in TSS (± 0.5%), 96.6% reduction in VSS (±1.1%), 91% reduction in chemical oxygen demand (COD), and nearly 100% removal of fats, oils, and greases (FOGs). Despite the high removal efficiencies, flotation was found not to be critically necessary for treatment because the high concentration of coagulants caused settling of the floes to occur just as rapidly. Potential coagulant overdosing is suspected at the higher end of the tested coagulant concentrations due to limited alkalinity in the wastewater. However, lack of residual metal (coagulant) ions in water may be linked to reactions leading to phosphate precipitation. The exact effect of the competing phosphate reaction on treatment efficiency is not clearly evident from this present study.
机译：评估了11种金属凝结剂和1种聚电解质在辅助溶解气浮（DAF）系统中的适用性，该系统旨在处理家禽加工废水。初步的罐装试验确定，将800 mg / L的FeCl_3（氯化铁）和900 mg / L的Floccin 1115结合使用，可以去除至少98％的总悬浮固体（TSS）和97％的固体悬浮物，从而提供最佳的处理效果。挥发性悬浮固体（VSS），同时使水的透明度提高97％。最终的浮选试验表明，絮凝的颗粒可以以40％的DAF循环比被带到表面。所得上清液显示净度提高94.7％（±1.4％），TSS降低97.3％（±0.5％），VSS降低96.6％（±1.1％），化学需氧量（COD）降低91％ 100％去除脂肪，油和油脂（FOG）。尽管去除效率很高，但是浮选对处理并不是至关重要的，因为高浓度的凝结剂会导致絮凝沉降的速度同样快。由于废水中碱度有限，怀疑在测试的混凝剂浓度较高时可能导致过量的混凝剂。但是，水中缺乏残留的金属（凝结剂）离子可能与导致磷酸盐沉淀的反应有关。根据本研究，竞争性磷酸盐反应对治疗效率的确切影响尚不清楚。

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  • 来源
    《Journal of Environmental Science and Health》 |2012年第13期|p.2069-2076|共8页
  • 作者

    ADAM J. DASSEY; CHANDRA S. THEEGALA;

  • 作者单位

    Department of Biological and Agricultural Engineering, Louisiana State University & LSU AgCenter, Baton Rouge, Louisiana,USA;

    Department of Biological and Agricultural Engineering, Louisiana State University & LSU AgCenter, 161 EB Doran Bldg., Baton Rouge, LA 70803;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    poultry wastewater; coagulation; dissolved air flotation;

    机译：家禽废水;凝结;溶解气浮;

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