The main aim of this study was to investigate the qualitative changes of the rainbow trout effluent as water supply in a drip irrigation system. Two drip irrigation systems with a hydro-cyclone filter, sand filter and screen filter for using freshwater (control treatment) and fish farm effluent were tested in Kurdistan province (northwest of Iran) in 2017. In addition, the effect of lateral drainage at the end of each irrigation event was also studied. Two emitter types with different discharge flows were used for each treatment. In the 16 irrigation events carried out, samples were collected from the different water sources (dam, well, and river), filter outlets and lateral locations for measuring total suspended solids (TSS), particle size, pH, electrical conductivity, different compounds (Fe, Na, K, Ca, Mg, NO 3 , PO 4 , HCO 3 ) and the number of coliform bacteria. The results showed changes in the TSS and the number of coliform bacteria, but the remaining parameters had slight changes. In both control and effluent treatments, the filtration system significantly reduced TSS, having the screen filters the greatest effect on this decrease and hydro-cyclone and sand filter the least. To achieve higher removals, it is recommended to use finer grains in sand filters. The filtration of both control and effluent treatments increased the number of bacteria. The highest number of bacteria in the control treatment was measured after the sand filter and in the effluent treatments after the screen filter.

中文翻译：

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组合过滤系统和滴灌支管对虹鳟养殖场出水水质的影响

本研究的主要目的是调查虹鳟鱼流出物作为滴灌系统供水的质变。2017 年在库尔德斯坦省（伊朗西北部）测试了两个带有水力旋流过滤器、砂滤器和筛网过滤器的滴灌系统，用于使用淡水（控制处理）和养鱼场废水。还研究了每次灌溉事件的结束。每种处理使用两种排放流量不同的发射器类型。在进行的 16 次灌溉事件中，从不同的水源（大坝、井和河流）、过滤器出口和横向位置收集样品，用于测量总悬浮固体（TSS）、粒径、pH、电导率、不同的化合物（ Fe、Na、K、Ca、Mg、NO 3 、PO 4 、HCO 3 ) 和大肠菌群的数量。结果显示TSS和大肠菌数量发生变化，但其余参数略有变化。在控制和污水处理中，过滤系统显着降低了 TSS，筛网过滤器对这种降低的影响最大，而水力旋流器和砂滤器的影响最小。为了实现更高的去除率，建议在砂滤器中使用更细的颗粒。对照和流出物处理的过滤增加了细菌的数量。在砂滤器之后和在筛网过滤器之后的污水处理中测量到对照处理中的最高细菌数。在控制和污水处理中，过滤系统显着降低了 TSS，筛网过滤器对这种降低的影响最大，而水力旋流器和砂滤器的影响最小。为了实现更高的去除率，建议在砂滤器中使用更细的颗粒。对照和流出物处理的过滤增加了细菌的数量。在砂滤器之后和在筛网过滤器之后的污水处理中测量到对照处理中的最高细菌数。在控制和污水处理中，过滤系统显着降低了 TSS，筛网过滤器对这种降低的影响最大，而水力旋流器和砂滤器的影响最小。为了实现更高的去除率，建议在砂滤器中使用更细的颗粒。对照和流出物处理的过滤增加了细菌的数量。在砂滤器之后和在筛网过滤器之后的污水处理中测量到对照处理中的最高细菌数。