College of Water Resources and Architecture Engineering, Northwest A&F University, Yangling, China.
Institute of Soil and Water Conservation, Northwest A&F University, Yangling, China.
J Sci Food Agric. 2022 Aug 15;102(10):4171-4181. doi: 10.1002/jsfa.11766. Epub 2022 Jan 22.
Although reclaimed wastewater drip irrigation (RWDI) is an effective technology for alleviating agricultural crop water stress and protecting the environment, the reclaimed wastewater (RW) may cause emitter clogging. Discharge ratio variation (Dra) and coefficient of uniformity (CU) play a key role in exploring the clogging degree of the emitter. Therefore, a meta-analysis was conducted to identify optimal management methods with an acceptable Dra and CU under RWDI.
The results indicate that the higher the concentration of various substances in RW, the higher is the risk of the emitter clogging. Suitable concentrations of iron (Fe), manganese (Mn), total suspended solids (TSS), chemical oxygen demand (COD), water hardness and calcium ions (Ca ) in RW were determined to be 0-0.2, 0-0.02, 0-50, 20-30, 200-250 and 0-40 mg L , respectively. Pressure-compensating emitters with relatively high discharge (>2 L h ) could prevent clogging in RWDI systems.
Based on the data analysis, a cumulative RWDI operation time of 375 h was determined as the most suitable time for lateral flushing to prevent clogging. This study identifies the conditions under which an increase in the service life of RWDI systems can be achieved. © 2022 Society of Chemical Industry.
尽管再生水滴灌（RWDI）是缓解农业作物水分胁迫和保护环境的有效技术，但再生水（RW）可能会导致滴头堵塞。排放比变化（Dra）和均匀系数（CU）在探索滴头堵塞程度方面起着关键作用。因此，进行了荟萃分析，以确定在 RWDI 下具有可接受的 Dra 和 CU 的最佳管理方法。
结果表明，RW 中各种物质的浓度越高，滴头堵塞的风险就越高。RW 中适宜的铁（Fe）、锰（Mn）、总悬浮固体（TSS）、化学需氧量（COD）、水硬度和钙离子（Ca ）浓度分别确定为 0-0.2、0-0.02、0-50、20-30、200-250 和 0-40mgL。具有相对较高排放（>2Lh）的压力补偿滴头可以防止 RWDI 系统中的堵塞。
基于数据分析，确定了 375h 的累计 RWDI 运行时间是防止堵塞最适合的横向冲洗时间。本研究确定了可以延长 RWDI 系统使用寿命的条件。©2022 化学工业协会。
