首页> 外文学位 >Development of portable recycled vertical flow constructed wetlands for the sustainable treatment of domestic greywater and dairy wastewater.
【24h】

Development of portable recycled vertical flow constructed wetlands for the sustainable treatment of domestic greywater and dairy wastewater.

机译:开发便携式再循环垂直流人工湿地,以可持续处理生活中水和乳品废水。

获取原文
获取原文并翻译 | 示例

摘要

The purpose of this study was to develop and evaluate a portable, recycled vertical flow constructed wetland (RVFCW) built with recyclable polyethylene terephthalate (PET) plastic, and to compare this wetland's treatment efficiencies to constructed wetlands built with traditional gravels. The ability of the RVFCWs to effect contaminant levels would be evaluated during the treatment of domestic greywater (GW) and dairy wastewater (DWW), to fully understand the capacities and limitations of the RVFCW across an entire wastewater spectrum.;A total of four 1 m2, portable, recycled vertical flow constructed wetlands (RVFCW) were built for this study. Two RVFCWs were built with recycled PET plastic as the primary wetland bed media, and two units were constructed with traditional volcanic tuff. Two sedimentation basins were built to provide wastewater flow to one of each type of RVFCW unit. The RVFCW units were dosed with 350 l d-1, six times during a two month period for both greywater and dairy wastewater. Each RVFCW was equipped with a reservoir which received the effluent from the wetland. The wetland effluent was recirculated back to the wetland with a submersible pump for a period of 16 hr. Water samples were taken at four different locations within the treatment stream: at the wastewater source, sedimentation basin outflow, RVFCW unit outflow, and recirculation outflow. Each water sample was analyzed for the following parameters: total phosphate (TP), ammonia-nitrogen, nitrate-nitrogen, sulfate (for the GW stage only), total suspended solids (TSS), total dissolved solids (TDS), total organic carbon (TOC), total nitrogen (TN) (for DWW stage only), biochemical oxygen demand (BOD) (for DWW stage only), pH, total plate count (TPC), fecal coliforms (FC), and Escherichia coli (for DWW stage only).;There was no statistical difference between the RVFCW unit types for all parameters except ammonia, nitrate and pH. The RVFCW units constructed with PET showed a 72.8+/-33% (p = 0.0266) and 65+/-11.7% (p = 0.0411) decrease in ammonia-nitrogen concentrations during GW and DWW treatment, respectively. Whereas, the RVFCW units constructed with volcanic tuff achieved an 84.5+/-20% (p = 0.0266) and 75+/-9.8% (p = 0.0411) reduction in ammonia-nitrogen concentrations during GW and DWW treatment, respectively. Also, the RVFCW PET units demonstrated a 4742+/-2526% (p = 0.0155) and 1449+/-1069% (p 0.0001) increase in nitrate-nitrogen concentrations during GW and DWW treatment, respectively. The RVFCW VT units demonstrated significantly a higher increase in nitrate-nitrogen concentrations, with a 7032+/-3207% (p = 0.0155) increase during GW treatment, and a 2607+/-1605% (p 0.0001) increase during DWW treatment. The final pH values for the RVFCW PET units were 8.23 (p = 0.0132) during GW treatment, and 8.2 (p = 0.0099) during DWW treatment. Whereas the final pH value for the RVFCW VT units was 8.32 during GW treatment (p = 0.0132) and 8.38 during DWW treatment (p = 0.0099).;The results of this study indicate that, under current design parameters, the RVFCW units are suitable for remediation of bacterial contamination in greywater, and that plastic PET can be successfully used as a construction medium without compromising treatment efficacy. The results also indicate that, under current design parameters, the RVFCWs are not entirely suitable as a holistic treatment system for greywater if nutrient and solids reduction is a priority. However, the RVFCW units would perform well as a primary or secondary treatment system for high strength agricultural wastewaters, if nutrients and solids reduction is a priority. The RVFCW design would be an unsuitable stand alone treatment system for wastewaters characterized by elevated concentrations of nitrate-nitrogen. However, the RVFCW PET unit outflow nitrate-nitrogen concentrations suggest that, with some design modifications, these units could be effectively used as stand-alone treatment systems for agricultural wastewaters. (Abstract shortened by UMI.)
机译:这项研究的目的是开发和评估使用可回收的聚对苯二甲酸乙二醇酯(PET)塑料建造的便携式,可循环使用的垂直流人工湿地(RVFCW),并将该湿地的处理效率与使用传统砾石建造的人工湿地进行比较。将在处理家庭中水(GW)和乳制废水(DWW)期间评估RVFCW影响污染物水平的能力,以充分了解RVFCW在整个废水范围内的能力和局限性。总共四个1为进行此项研究,建造了m2的便携式循环垂直流人工湿地(RVFCW)。用再生的PET塑料作为主要的湿地床介质建造了2座RVFCW,用传统的火山凝灰岩建造了2座。建造了两个沉淀池,以为每种类型的RVFCW装置之一提供废水。 RVFCW装置在两个月的时间内对灰水和乳品废水分别进行了350升d-1的六次分装。每个RVFCW都配备有一个水库,该水库接收湿地的废水。用潜水泵将湿地废水再循环回湿地,持续16小时。在处理流中的四个不同位置采集水样:废水源,沉淀池流出,RVFCW单元流出和再循环流出。分析每个水样的以下参数:总磷酸盐(TP),氨氮,硝酸盐氮,硫酸盐(仅用于GW级),总悬浮固体(TSS),总溶解固体(TDS),总有机碳(TOC),总氮(TN)(仅用于DWW阶段),生化需氧量(BOD)(仅用于DWW阶段),pH,总板数(TPC),粪大肠菌群(FC)和大肠杆菌(用于DWW RVFCW单元类型之间除氨,硝酸盐和pH值外的所有参数没有统计学差异。用PET制成的RVFCW装置在GW和DWW处理期间氨氮浓度分别降低了72.8 +/- 33%(p = 0.0266)和65 +/- 11.7%(p = 0.0411)。然而,用火山凝灰岩建造的RVFCW装置在GW和DWW处理期间氨氮浓度分别降低了84.5 +/- 20%(p = 0.0266)和75 +/- 9.8%(p = 0.0411)。此外,RVFCW PET装置在GW和DWW处理期间,硝酸盐氮浓度分别增加了4742 +/- 2526%(p = 0.0155)和1449 +/- 1069%(p <0.0001)。 RVFCW VT装置显示出硝酸盐-氮浓度显着增加,在GW处理期间增加了7032 +/- 3207%(p = 0.0155),在DWW处理期间增加了2607 +/- 1605%(p <0.0001) 。在GW处理期间,RVFCW PET单位的最终pH值为8.23(p = 0.0132),在DWW处理期间为8.2(p = 0.0099)。 RVFCW VT装置的最终pH值在GW处理期间为8.32(p = 0.0132),在DWW处理期间为8.38(p = 0.0099)。;该研究结果表明,在当前设计参数下,RVFCW装置是合适的可以修复灰水中的细菌污染,并且塑料PET可以成功用作建筑介质而不会影响处理效果。结果还表明,在当前设计参数下,如果优先考虑减少营养物质和固体成分,RVFCW则不完全适合作为灰水的整体处理系统。但是,如果优先考虑减少养分和固体成分,则RVFCW单元作为用于高强度农业废水的一级或二级处理系统将表现良好。对于以硝酸盐-氮浓度升高为特征的废水,RVFCW设计将是不合适的独立处理系统。但是,RVFCW PET装置流出的硝酸盐-氮浓度表明,经过一些设计修改,这些装置可以有效地用作农业废水的独立处理系统。 (摘要由UMI缩短。)

著录项

  • 作者

    Roberts, Bronte Marie.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Agriculture General.;Water Resource Management.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2011
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:44:57

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号