This article studied how wastewater treatment performance of a short rotation forestry system was influenced by the seasonal operational changes under the extreme Mongolian winter conditions. For this reason, two beds planted with Willow (Salix spec.) and Poplar (Populus spec.) trees were operated over a period of two years under two different seasonal conditions: (A) “external winter storage” and (B) “internal winter storage” of pretreated wastewater. For operational condition A, the tree-bed was loaded with wastewater for only 4 summer months. For this operational condition it was considered that the treatment bed was fed with primary treated wastewater, which was stored in a sealed pond during the remaining 8 months. The other Bed B was irrigated throughout the year (12 months) with the same daily loading rate. In winter, the wastewater accumulated as ice in the tree-bed. Bed A, with external winter storage, showed mass removal percentage up to 95%, while the bed with internal winter storage showed mass removal rates up to 86% for pollutants such as COD, BOD₅, TN, and TP. A high yield of biomass was recorded for both beds with slight differences. Based on the results, a design recommendation was developed for full-scale systems of short rotation coppice irrigated with wastewater under various operational conditions, which show these systems to be a viable method for treating wastewater and producing biomass for energy production in Mongolia.

中文翻译：

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寒冷气候下柳树系统的废水处理与木材生产

本文研究了在极端蒙古冬季条件下季节性操作变化如何影响短轮伐林系统的废水处理性能。出于这个原因，在两张床上种植了柳树（Salix spec.）和杨树（Populus spec. ）。）树木在两种不同的季节性条件下运行了两年：（A）“外部冬季储存”和（B）预处理废水的“内部冬季储存”。对于操作条件 A，树床仅在夏季 4 个月内就充满了废水。对于这种操作条件，可以考虑向处理床注入初级处理过的废水，并在剩余的 8 个月内将其储存在密封的池塘中。另一个床 B 全年（12 个月）以相同的日负荷率进行灌溉。在冬天，废水在树床上积聚成冰。带有外部冬季存储的床 A 的质量去除率高达 95%，而带有内部冬季存储的床对 COD、BOD ₅等污染物的质量去除率高达 86%、TN 和 TP。两个床都记录了高生物质产量，但略有不同。基于这些结果，为在各种操作条件下用废水灌溉的短轮换灌木丛的全尺寸系统制定了设计建议，这表明这些系统是处理废水和生产用于蒙古能源生产的生物质的可行方法。