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首页> 外文会议>International Conference on Wetlands amp; Remediation Salt Lake City, Utah, November 16-17, 1999 >An ecological and economic overview of wetland wastewater assimilation in coastal louisiana
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An ecological and economic overview of wetland wastewater assimilation in coastal louisiana

机译：路易斯安那州沿海湿地废水同化的生态和经济概况

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摘要

We review wetland wastewater assimilation studies in the Louisiana coastal zone. Insufficient sedimentation, coupled with high rates of relative sea level rise (RSLR), are two important factors contributing to wetland loss in coastal Louisiana. We hypothesized that adding nutrient rich treated wastewater effuent to selected coastal wetlands results in four benefits: (1) improved effluent water quality; (2) increased accretion rates to help offset subsidence; (3) increased productivity of vegetation; and (4) financial savings of capital not invested in conventional tertiary treatment systems. To test these hypotheses, we are currently monitoring several wetlands that are receiving secondarily treated wastewater. At one site, rates of accretion increased significantly after wastewater application began (from 7.8 to 11.4 mm yr~(-1), and approached the estimated rate of regional RSLR (12.0 mm yr~(-1). Surface water nutrient reduction ranged from 100percent for NO3-N to 66percent for total P. At a site that has been receivign wastewater effluent for 40 years, dendrochronological analysis revealed significantly increased cypress stem growth in the treatment site. Results of avoided costs analyses between wetlands treatment and conventional treatment indicate cost savings of
机译：我们回顾了路易斯安那州沿海地区的湿地废水同化研究。沉积不足以及相对海平面上升率（RSLR）高是造成路易斯安那州沿海湿地丧失的两个重要因素。我们假设在选定的沿海湿地中添加经过富营养处理的废水可产生四个好处：（1）改善出水水质； （2）增加吸积率以抵消沉降； （3）提高植被生产力； （4）未投资于常规三级处理系统的资金的财务节省。为了检验这些假设，我们目前正在监测几个湿地，这些湿地正在接受二次处理的废水。在一个地点，开始应用废水后，吸积率显着增加（从7.8 mm yr〜（-1）增至11.4 mm yr〜（-1），接近区域RSLR的估计速率（12.0 mm yr〜（-1）。在已经接受废水排放40年的地点，树轮年代学分析显示，处理地点的柏树茎生长明显增加，在湿地处理和常规处理之间避免成本分析的结果表明成本节省

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