Enhanced solid-liquid separation of dairy manure with natural flocculants.
Enhanced solid-liquid separation of dairy manure with natural flocculants.
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DOI：
10.1016/j.biortech.2008.11.012
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发表时间：
2009-11
影响因子：
11.4
通讯作者：
M. C. Garcia;A. Szogi;M. Vanotti;John P. Chastain;Patricia Millner
中科院分区：
文献类型：
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作者：
M. C. Garcia;A. Szogi;M. Vanotti;John P. Chastain;Patricia Millner
以壳聚糖为模型，采用固液分离法，研究了天然絮凝剂降低奶牛废水中固体和营养负荷的效果。用不同浓度(总固形物含量分别为0.4%、0.8%、1.6%和3.2%)的冲洗牛粪测定其利用效率和最佳施肥量。处理包括9个比例的壳聚糖。用1 mm和0.25 mm筛对絮凝后的粪便进行脱水。单靠筛分并不有效；总悬浮固体(TSS)、凯氏定氮(TKN)和总磷(TP)的平均效率分别约为60%、22%和26%。在筛选前与壳聚糖混合大大提高了分离度。在最佳壳聚糖用量(最佳出水浓度为0.5g/L)下，TSS的分离率为95%，TKN的分离率为73%，TP的分离率为54%。研究结果表明，壳聚糖等天然絮凝剂可用于畜禽废水的固液分离处理。
The aim of this study was to determine the effectiveness of natural flocculants to reduce solids and nutrient loads in dairy cow wastewater using solid–liquid separation; chitosan was used as a model. Its use efficiency and optimum application rate were determined using flushed dairy cow manure of varied strengths – 0.4%, 0.8%, 1.6%, and 3.2% total solids (TS) content. Treatments consisted of nine rates of chitosan. The flocculated manure was dewatered using 1-mm and 0.25-mm screens. Separation by screening alone was not effective; average efficiencies were about 60% for total suspended solids (TSS), 22% for total Kjeldahl nitrogen (TKN), and 26% for total phosphorus (TP). Mixing with chitosan before screening substantially increased separation. At optimum chitosan rate (0.5g/L for the highest strength effluent), separation efficiencies were >95% for TSS, >73% for TKN, and >54% for TP. The results of this study indicate that natural flocculants such as chitosan are useful for the solid–liquid separation treatment of livestock wastewater.