Abstract

The application of treated wastewater (TWW) via pressurized drip irrigation (DI) systems, specifically micro-irrigation, is an effective solution to mitigate water scarcity. TWW contains a higher concentration of nutrients and microbial activity compared to fresh water (FW) and poses a larger danger of fouling and subsequent clogging to DI systems. The goal of this paper was to characterize the effectiveness of chemical treatments, specifically hydrogen peroxide (H₂O₂) in preventing clogging in DI systems utilizing secondary (ST) and tertiary (TT)_TWW. A novel field model was employed to compare the flow rate (FR), fouling accumulation and composition in laterals and emitters of different treatments. Under ST_TWW irrigation, control treatment performance quickly declined while regular low concentration H₂O₂ treatments exhibited the lowest amounts of fouling and maintained nominal FR and coefficient of variation (CV). Shock treatments, defined as periodical applications of concentrated chemicals combined with lateral flushing, were ineffective in maintaining satisfactory irrigation performance.

摘要

通过加压滴灌 (DI) 系统（特别是微灌）应用处理过的废水 (TWW) 是缓解水资源短缺的有效解决方案。与淡水 (FW) 相比，TWW 含有更高浓度的营养物质和微生物活性，并且对 DI 系统造成更大的污染和随后堵塞的危险。本文的目的是描述化学处理的有效性，特别是过氧化氢（H ₂ O ₂) 在使用二级 (ST) 和三级 (TT)_TWW 的 DI 系统中防止堵塞。采用一种新的现场模型来比较不同处理的支流和排放器中的流速 (FR)、污垢积累和成分。在 ST_TWW 灌溉下，对照处理性能迅速下降，而常规低浓度 H ₂ O ₂处理表现出最低的结垢量并保持标称 FR 和变异系数 (CV)。冲击处理，定义为浓缩化学品的定期应用与侧向冲洗相结合，在保持令人满意的灌溉性能方面是无效的。