Wastewater heat pump technology

as a renewable energy source

demonstrates significant potential for the recovery and utilization of thermal energy from urban wastewater. This review systematically summarizes the current research status

technical advantages

challenges

and future development trends of wastewater heat pump technology. First

the impact of wastewater characteristics on system performance was analyzed

focusing on suspended solids (SS)

corrosive components

and non-Newtonian fluid behavior that constrain flow and heat transfer mechanisms. The causes of key issues

such as scale deposition and heat transfer efficiency decay

are revealed

along with existing solutions

such as electromagnetic scale removal and ultrasonic anti-scale methods. Additionally

the review discusses innovative developments in equipment by different researchers

including automatic screening and filtration devices

modular indirect heat exchangers

and corrosion-resistant nonmetallic materials

which have effectively enhanced system reliability and economics. Finally

an economic and environmental benefit analysis indicated that while wastewater source heat pump systems have higher initial investment costs

their long-term operational costs and carbon emissions are significantly lower than those of traditional fossil fuel-based systems. This review integrates the research outcomes of wastewater heat pump technology over the past decade

aiming to provide references for global technological development and advocate for interdisciplinary collaboration and policy support to facilitate the transition from laboratory research to large-scale practical applications.