According to two sources who have direct knowledge of this matter, Actis and I Squared Capital, global infrastructure investors, are considering bids for Beijing Capital Group’s Singapore waste management company ECO.

Sources said that Keppel of Singapore is also interested, and they are working with financial advisors to consider making binding bids for ECO Special Waste Management.

Reuters reported that China's Beijing Capital hired Citigroup to sell its company last year in a deal which could bring $300 to $400 million.

Sources said that the deadline for bids could be as soon as the end of the month. They added that the deliberations were still in progress and no final decisions had been made. The firms may decide not to pursue a deal.

Sources declined to name themselves as it was a private matter.

Actis, I Squared, and Keppel declined comment. Reuters requests for comments to ECO, Beijing Capital were not immediately responded to.

Beijing Capital purchased the business in 2015 from Navis Capital, a private equity firm for S$246,000,000 ($181,89 million).

The region's population growth and the shift to cleaner and greener energy has increased investor interest in Southeast Asia’s waste management industry.

A Keppel consortium purchased a 80% share in Singaporean environmental service firm 800 Super Holdings, for S$304 millions.

Beijing Capital is a Chinese company that operates in the areas of wastewater treatment, construction and development of water resources, as well as real estate.

The website also shows that it has businesses in the financial sector, culture and sports sectors.

According to its website, ECO was founded in 1997 and provides waste management in Singapore. It is located at Tuas View Circuit and has facilities and a fleet that includes more than 40 vehicles for waste collection. ($1 = 1.3525 Singapore dollars)