About 6,000 tons of solid waste is produced daily in Hanoi, 95 percent of which is buried, according to the city’s construction department.

Hanoi authorities have called on enterprises to invest in technologies to treat and recycle waste to turn waste into useful materials. 

Nguyen Phuc Thanh, general director of Enserco, said his company has a patent for technology to treat domestic waste by burning with heat recovery.

The technology reduces waste treatment costs as it uses less supporting fuel because it removes garbage components that cannot be burned and dries garbage to reduce humidity before burning. 

During the waste burning process, the heat from the incinerator emissions is used to dry garbage and heat the air provided to the incinerator. When sorting and drying garbage, workers use equipment to collect gas in the incinerator in order to reduce the discharge of bad odors into the environment.

Enserco’s waste treatment plant in Son Tay can treat 700 tons of waste a day.

During the waste burning process, the heat from the incinerator emissions is used to dry garbage and heat the air provided to the incinerator. When sorting and drying garbage, workers use equipment to collect gas in the incinerator in order to reduce the discharge of bad odors into the environment.

Meanwhile, the Construction and Demolition Waste Treatment Environment JSC is implementing a project on using technology to grind construction waste into building materials. 

According to the company’s director Dang Tien Thanh, the volume of construction waste in Hanoi has reached 3,000 tons a day, which has been mostly buried or used for leveling depressed areas. 

The company decided to import a high-tech waste grinding line from Germany in Hanoi. The construction waste after the treatment can be re-used as material for transport infrastructure works.

According to Nguyen Van Quy from the Hanoi Construction Department, after the city authorities announced the 10 criteria for choosing waste-treatment partners, many candidates registered. They all have good financial capability and experience in waste treatment.

However, at present, burying waste remains the major treatment method used in Hanoi.

Urenco’s general director Nguyen Huu Tien said a garbage water treatment plant, which meets QCVN 5945-2005 standards, has been set up at the Nam Son Solid Waste Complex, but it still cannot resolve all the impact on the environment.

Hoang Duong Tung, deputy general director of the Environment General Directorate, said the biggest problems in domestic solid waste treatment in Vietnam are that comprehensive measures are not taken, and waste cannot be sorted at source and recycled to reduce the volume of buried waste. 

While big volumes of waste are buried, investors cannot find enough waste to develop energy projects.

RELATED NEWS

Half of industrial clusters in Hanoi lack waste treatment plant

WTE technology: a good solution to generate electricity from waste

Kim Chi