Leaders of the Hà Nội Sewage and Drainage Company One Member Co,Ltd answer questions on measures to clean up the Tô Lịch River. — Photo thanhnien.vn

HÀ NỘI — The use of millions of cubic metres of water from the Hồng (Red) River to supply West Lake and clean the polluted Tô Lịch River has been the cheapest and best way to clean the latter river so far, the Hà Nội Sewage and Drainage Company One Member Co, Ltd has said.

Director of the company Võ Tiến Hùng made the statement at a press conference yesterday.

Võ Tiến Hùng, director of the company, said the use of Redoxy3C technology from Germany to clean some lakes and rivers in Hà Nội had been piloted and gained success.

Answering a question on the quality and the price differences between Germany technology’s Redoxy3C and Japanese bio-nanotechnology, Hùng said the enterprises have just announced the quality of the experimental treatment.

The prices remain unknown.

Hùng said the city welcomed all the experiments. The company has received five delegations to evaluate and pilot their technology to clean rivers and lakes. However, the results have not been as expected.

Hùng said using water from the Hồng (Red) River to supply West Lake and clean Tô Lịch River has gained public attention.

Many people have raised concerns over the wastewater of the cleaning progress of Tô Lịch River. Of that, wastewater should be separated and sent into Yên Xá Wastewater Treatment Plant for treatment instead of being sent directly into the river.

Hùng said the scientists approved of the initiative. The city has asked the relevant authorities to examine the plan before giving it the green light.

In reply to a question on the flowing of wastewater into downstream areas, Hùng said the city planned to send the wastewater to Yên Xá Wastewater Treatment, which would be constructed in 2023.

The company has worked with local authorities in downstream provinces to close the dam to stop polluted wastewater flowing into the area.

Hùng said the budget for the plan was estimated to be about VNĐ150 billion (US$6.45 million).

In May, Hà Nội authorities launched the project to clean a section of Tô Lịch River, using Japanese cleaning nano-technology.

The Japanese cleaning equipment was used on the most polluted section of the river located near Hoàng Quốc Việt Street in Cầu Giấy District. 

Called the Nano Bioreactor, the equipment was placed on the bed of a 300-metre section of the river.

The device creates and diffuses nano-gas streams into the surrounding water to stimulate microorganisms, which helps to release oxygen and decompose the mud in the riverbed, making the water cleaner.

Nano-bioreactor technology has also been used in West Lake. — VNS