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首页> 外文会议>Sustainable irrigation and drainage IV: Management, technologies and policies >Subsurface drip irrigation with reclaimed water: issues we must think now
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Subsurface drip irrigation with reclaimed water: issues we must think now

机译：用再生水进行地下滴灌：我们现在必须考虑的问题

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Subsurface drip irrigation (SDI) is regarded as the most efficient and safe technology in reclaimed water irrigation schemes as it minimizes potential human exposure to low quality water. However, the system performance is often limited due to emitter clogging by complex biophysical activities as the whole assembly is laid underground. Growing evidence suggest that soil temperature is strongly correlated with emitter clogging although the dynamics of how it affects emitter performance is yet to be understood. This study analyses the thermal variation in rhizosphere including the consequent changes in recycled water quality and their implications on bio-fouling of emitters. In the northern horticultural district of Adelaide, seasonal variation of 18℃ at 20 cm below the ground is very common and the recorded variation in any 10 year period is notably high (25.8℃). Furthermore, the average diurnal variation is also important for operational purpose as the minimum and maximum soil temperature in any day would always occur in specific times. This variation in subsurface temperature affects reclaimed water quality primarily by regulating microbial growth in the labyrinth flow path of emitters. The ever changing level of microbial quality of recycled water still poses threat to sustainable practice of drip technology. The study concludes that future research, design and operation of reclaimed water irrigation schemes must account for these sustainability issues.
机译：在再生水灌溉方案中，地下滴灌（SDI）被认为是最有效，最安全的技术，因为它最大程度地减少了人类可能接触到的劣质水。但是，由于整个组件都放在地下，复杂的生物物理活动会堵塞发射器，因此系统性能通常会受到限制。越来越多的证据表明，土壤温度与排放物堵塞密切相关，尽管尚不清楚其如何影响排放物性能的动力学。这项研究分析了根际的热变化，包括随之而来的循环水水质变化及其对排放源生物污染的影响。在阿德莱德北部园艺区，在地下20厘米处的18℃季节变化非常普遍，在任何10年期间记录到的变化都很高（25.8℃）。此外，平均日变化对于操作目的也很重要，因为任何一天中的最低和最高土壤温度始终会在特定时间发生。地下温度的这种变化主要通过调节排放口迷宫式流动路径中的微生物生长来影响再生水的质量。循环水微生物质量水平的不断变化仍然对滴灌技术的可持续实践构成威胁。研究得出的结论是，中水灌溉计划的未来研究，设计和运行必须考虑这些可持续性问题。

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