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中文摘要：
再生水源热泵系统能够利用城市再生水中的低品位热能为城市建筑进行制冷、供暖,但微生物污垢会降低系统的运行效率与安全性能,而钙离子浓度对污垢的生长有重要影响。本文考察了流动条件下,不同浓度的Ca^2＋对微生物污垢的影响及其作用机理。实验中配制了不同Ca^2＋浓度的人工再生水,并进行旋转挂片实验生成微生物污垢。分别测量了不同Ca^2＋浓度下微生物污垢的总质量、干重和有机物质量,计算了污垢中游离水与结合水的含水率,并观测了污垢的显微结构。结果表明：Ca^2＋浓度上升会提高微生物污垢的空间多孔化程度,促进游离水含量及污垢总质量的上升。该研究可以对不同工况下微生物污垢的生长进行预测,提高再生水源热泵系统的工作效率。
英文摘要：
Treated sewage source heat pump systems could reuse the large amount of wasted heat in the city sewage to refrigerate and heat the buildings. However, biofouling, which is the key problem in treated sewage heat pump systems, decreases the system efficiency and security. Ca^2＋ , which is an important inorganic ion for bacteria metabolism, has a significant influence on biofouling formation. In this study, the effect and mechanism of calcium ions concentration on biofouling growth were investigated under flowing conditions. Model sewage was prepared, with the Ca^2＋ concentration ranging from 100 mg/L to 450 mg/L, and a rotating coupon device was used for biofouling formation. The total weight, dry weight and organic weight of biofouling grown under different Ca^2＋ concentrations were measured, the moisture content of the biofouling was calculated, and the microstructure of the biofouling was viewed. The results indicated that biofouling grown under higher Ca^2＋ concentrations have a more heterogeneous and porous structure, thus the moisture content and the total mass of the biofouling were increased. The results of this study could be used for predicting the biofouling formation under different operation conditions and improving the performance of treated sewage source heat pump systems.
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