WHEN IS CANAL GREEN IN?

According to Ho Chi Minh City Urban Environment One Member Limited Liability Company, picking up garbage on Nhieu Loc - Thi Nghe canal is done every day, but it only partially improves the pollution situation. This is also one of the reasons why fish on this canal have died in large numbers in recent times, especially at the beginning of the rainy season.

Explaining the situation of re-pollution of canals, experts say that it is an inevitable consequence of not thoroughly treating wastewater before discharging it into the environment. Specifically, the sewer line along Nhieu Loc - Thi Nghe canal under the environmental sanitation project (stage 1) has been completed with the expected collection of all wastewater from about seven districts along the canal.

However, because the second phase (construction of the wastewater treatment plant) has not been completed, when it is brought to the pumping station on Nguyen Huu Canh Street (Binh Thanh District), the wastewater is only trimmed of garbage and pumped to the Saigon River for treatment. pollution dilution.

Wastewater treatment here is just like bringing pollution from one place to another. Although diluted, wastewater still contributes to polluting rivers and canals. On the other hand, because the wastewater collection sewer system of the project is connected to the stormwater drainage system, when it rains heavily, rainwater mixed with wastewater overflows into the canal, gradually causing pollution.

Similarly, for Tau Hu - Ben Nghe - Kenh Doi - Kenh Te canal, Binh Hung factory (stage 1) has only treated wastewater for a basin of 1,000ha in districts 1, 3, 5, and part of districts. 10, 11. And the 2,000-hectare basin in districts 6, 8, 11, Tan Binh, Binh Thanh, and Binh Chanh districts still have to wait for the next phase to be implemented.

The project to renovate Tan Hoa - Lo Gom canal also does not have a wastewater treatment plant, so most of the domestic wastewater from households along these canals is poured directly into the polluting canal.

SOLUTION TO THE PROBLEM OF COLLECTION, WASTEWATER TREATMENT

The fact shows that one of the causes leading to inefficient wastewater treatment is an inconsistent investment. Some places have completed the construction of the collection system, but the wastewater treatment plant has not been built (such as Nhieu Loc - Thi Nghe canal), there are places where the wastewater treatment plant has been built, but there is no sewer system. and convey wastewater to the factory (Tham Luong - Ben Cat project).

According to the plan, there will be 12 wastewater treatment plants in 12 drainage basins, but so far only three plants have been built and are not operating at full capacity, including Binh Hung (capacity 141,000m3/day), Binh Hung Hoa (30,000m3/day) and Tham Luong - Ben Cat (15,000m3/day). In addition, there are several distributed wastewater treatment stations in residential areas. With these plants, the total amount of treated wastewater currently accounts for only 12.6%.

Currently, the amount of urban wastewater generated in HCMC is about 1.54 million m3/day. Untreated wastewater is discharged directly into the environment, polluting surface water and affecting people's daily life.

Without perfecting the collection infrastructure, separating wastewater sources (rainwater, domestic wastewater, industrial wastewater), and having no solution to thoroughly treat wastewater before being discharged into the environment, it is impossible to solve the problem. determine the basis of pollution of rivers, canals, and canals in Ho Chi Minh City.

In recent years, the amount of wastewater discharged into the environment has continuously increased. From 2018 to 2021, the average wastewater rate is estimated to increase by 6.7% each year. The difficult problem is that the investment cost of the drainage and wastewater treatment system is quite large, the construction of a domestic wastewater treatment plant requires a large land fund, so site clearance is difficult.

Via: tuoitre.vn