In a groundbreaking move toward sustainable energy, industrial wastewater and domestic sewage have been transformed into valuable resources, serving as an innovative "new energy" source for heating and cooling systems. On March 26, a reporter learned at the promotion conference of the original sewage heat source heat pump technology that this system was independently developed by Dalian Shuguang Energy-saving Air Conditioning Equipment Factory. This pioneering technology has opened new pathways for energy conservation and emission reduction in China’s building sector.
The system operates by utilizing sewage from nearby urban pipelines. In winter, it extracts heat from the sewage to provide warmth, while in summer, it removes heat from indoor spaces and transfers it back into the sewage network. The technology has received high recognition from an expert group comprising the Chinese Academy of Architectural Sciences, the Dalian Municipal Construction Committee, and the Dalian Municipal Science and Technology Bureau. It has been officially rated as “the first in China, internationally advanced,†with significant social and economic benefits.
Primary sewage includes domestic waste, industrial effluent, and secondary treated water. Untreated sewage is often complex, containing various pollutants. To address these challenges, Dalian Hoko Energy-Saving Air-Conditioning Plant developed the world's first fully automatic sewage decontamination equipment. These systems effectively filter out debris and impurities, allowing the cleaned sewage to be returned to the main sewer lines through a heat exchanger.
According to reports, the energy efficiency ratio (EER) of untreated sewage systems exceeds 4.0, which is more than 80% more efficient than traditional coal-fired boilers. Compared to electrical heating methods, it is 3–4 times more efficient, and compared to conventional central air conditioning systems, it can save 30%–60% in operating costs. In terms of water conservation, since no cooling towers are used, there is no water evaporation or drift, leading to substantial savings. For every 10,000 square meters of building space, more than 4,000 tons of water can be saved annually during the cooling season.
From an environmental perspective, the original sewage heat pump system recycles waste heat, eliminating combustion processes and reducing greenhouse gas emissions. It produces no solid waste, toxic gases, or soot, making it a clean and eco-friendly solution.
In 2007, Friendship Group’s Dalian Development Zone Friendship Mall implemented the original sewage heat pump air conditioning system. Using untreated sewage from its own pipeline as a heat source, the system provided heating in winter and cooling in summer. After adopting the system, the mall saved 338,000 yuan in heating costs during winter and 200,000 yuan in cooling electricity in summer.
Experts estimate that China’s urban sewage volume is enormous. In 2006, the total national sewage discharge reached 53.7 billion tons, expected to rise to 73 billion tons by 2010. If the waste heat from this sewage could be recovered using raw sewage heat pump systems, it could potentially meet the heating needs of over 3 billion square meters of buildings during winter. This technology not only offers a sustainable energy solution but also paves the way for a greener future in urban development.
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