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首页> 外文期刊>Journal of the Chinese Institute of Environmental Engineering >NUTRIENT REMOVAL FROM SEWAGE BY TWO-STAGE CONSTRUCTED WETLAND SYSTEMS
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NUTRIENT REMOVAL FROM SEWAGE BY TWO-STAGE CONSTRUCTED WETLAND SYSTEMS

机译：两阶段构建的湿地系统排污中的养分去除

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摘要

Two lab-scale, two-stage constructed wetland systems, including gravel-soil beds with or without plants were used to study the nutrient removal effects of primarily treated sewage. According to our experimental results, in both systems, the gravel beds (the first stage) removed most of the N and P nutrients (above 70% of removal efficiencies) during the three-month running time after the systems had reached a steady state. However, the soil bed (the second stage) in the vegetated wetland system showed little increase in N nutrient, while further removal of P nutrient was found in the bed. In the system without vegetation, we found that both N and P nutrients were removed further in the soil bed. The reason might be that the plant litter was accumulated on the soil surface of the vegetated bed with a free water surface flow regime, in which the plant uptake effect might be less than plant litter release effect on N nutrient. However, the accumulation of plant litter did not affect the nutrient levels in the effluent of the vegetated gravel bed due to its subsurface flow pattern. The average first-order rate constants for nitrogen removal in the systems with and without vegetation were measured to be equal to 0.067 and 0.073 day~(-1), respectively, while the numbers were equal to 0.045 and 0.107 day~(-1), respectively for phosphor removal. The conclusion is that the biological processes, including microflora processing and macrophyte uptake, were dominant in the vegetated gravel bed to remove N nutrient, while P nutrient was removed mainly by chemical adsorption in the soil bed with or without plant. It might be that (due to) the higher porosity and significant root zone effects exist in the vegetated gravel bed system and that (to) the mineral clay soil type has low porosity in the soil bed.
机译：使用两个实验室规模，两阶段建造的湿地系统（包括有或没有植物的砾石土壤床）来研究经初步处理的污水的养分去除效果。根据我们的实验结果，在两个系统中，砾石床（第一阶段）在系统达到稳定状态后的三个月运行时间内，去除了大部分N和P营养（去除效率超过70％）。然而，植被湿地系统中的土壤床（第二阶段）的氮养分几乎没有增加，而床中的磷养分进一步被去除。在没有植被的系统中，我们发现土壤床中的氮和磷养分都被进一步去除。原因可能是植物凋落物堆积在植被床的土壤表面，水面自由流，其中植物的吸收效应可能小于植物凋落物对氮素的释放效应。但是，由于植物渣的地下流动方式，其堆积不会影响植被砾石床废水中的营养水平。在有植被和无植被的系统中，脱氮的平均一阶速率常数分别为0.067和0.073 day〜（-1），而分别为0.045和0.107 day〜（-1）。 ，分别用于磷光体的去除。结论是，在植被砾石层中，包括微生物区系处理和大型植物吸收在内的生物学过程占主导地位，以去除N养分，而在有或没有植物的情况下，土壤中的P养分主要通过化学吸附来去除。植被砾石床系统可能存在（由于）较高的孔隙度和明显的根部区域效应，而（矿物土）土壤类型的土壤床中的孔隙度较低。

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