Since 1995, ZHEC has played an active part in the restoration works for closed landfill sites, including their design, construction and operation.

As a leading member of Hong Kong Landfill Restoration Group Ltd., ZHEC has successfully secured two contracts in Hong Kong to undertake the restorations of six closed landfill sites. ZHEC works closely with the Environmental Protection Department to ensure a high standard of environmental performance capability.

ZHEC has also proposed and successfully executed a number of plans for the re-use of environmental resources. The completion of a landfill gas electricity generation facility in the Jordan Valley landfill site, an auxiliary energy facility for town gas generation making use of landfill gases collected from Sheung Wan Landfill Site, and the construction of a golf driving range after landfill restoration all serve as good examples of the re-use of environmental resources.

In 2001, ZHEC introduced environmental technologies from Canada. In this project the company employs an advanced biochemical technology in the treatment of contaminated sediments to solve the pollution problems that have plagued the Shing Mun River for many years.

This is one of the largest-scale biochemical treatment projects of its kind in the world. The technical problems and complications ZHEC faced have been especially onerous, but the company saw the work through successfully. This project achieved a major milestone for the riverbed environment restoration.

ZHEC is eager to strengthen its development in the area of environmental protection projects in order to create a healthier ecological environment for the public.