Corbala-Robles L, Ronsse F, Pieters J G, Volcke E I P
Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium E-mail:
Department of Plants and Crops, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
Water Sci Technol. 2018 Dec;78(11):2270-2278. doi: 10.2166/wst.2018.507.
This paper assesses the economics of heat recovery from biological wastewater treatment plants (WWTPs) treating concentrated wastewater, as higher concentrations result in higher heat generation in the treatment basin. A heat balance model has been applied to calculate the amount of recoverable heat from the system and the effect of the heat extraction capacity on the economics of a heat pump installation, evaluated using the internal rate of return. A sensitivity analysis has been performed to evaluate the effect of several parameters on the economics of heat recovery in this type of WWTP: the electricity price, the price of the fuel substituted by heating savings, the investment costs, the coefficient of performance (COP) and the amount of heat extracted from the system. It was calculated that the heat pump capacity has to be high enough to recover a significant amount of heat, but low enough to improve the economics of the system. The economic performance of the system is very dependent on the energy prices of both electrical power to run the heat pump and the fuel (heat) cost substituted by the heat pump.
本文评估了处理浓缩废水的生物污水处理厂（WWTPs）的热回收经济性，因为较高的浓度会导致处理池中产生更多热量。已应用热平衡模型来计算系统中可回收的热量，以及热提取能力对热泵装置经济性的影响，并使用内部收益率进行评估。进行了敏感性分析，以评估几个参数对这类污水处理厂热回收经济性的影响：电价、因节省供热而替代的燃料价格、投资成本、性能系数（COP）以及从系统中提取的热量。计算得出，热泵容量必须足够高以回收大量热量，但又要足够低以提高系统的经济性。系统的经济性能非常依赖于运行热泵所需的电力能源价格以及热泵所替代的燃料（热）成本。
