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PFS on Wastewater and Drainage System Seeks to Improve Public Health and Environmental Condition in Three Vietnam Cities

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The cities of Can Tho, Vinh, and Hai Duong in Vietnam recently became recipients of CDIA support for the conduct of pre-feasibility studies (PFS), which recommended the upgrading and development of key infrastructure projects to improve their wastewater and drainage systems.

The PFS came after the request of the three cities, with endorsement from GIZ Vietnam to help them address flooding and inadequate sanitation facilities, two major developmental problems in the three cities.

Flooding usually occurs as a result of the three cities’ topography, and is compounded by their sanitation infrastructure, which are currently insufficient, disjointed, inappropriate or inefficient to address their hydrological conditions; and the needs of the growing population, in general.

In Can Tho for example, their wastewater treatment plant that is being constructed can only collect 20% of the wastewater produced in the city. The rest of the untreated wastewater is being discharged to canals, streams and rivers, thereby causing environmental pollution and public health threat.

To address these issues, CDIA and the three cities examined various wastewater and drainage infrastructure projects, and recommended those found to be technically and financially viable, and those that can provide positive benefits to people living in the service area and the surrounding environment.

In particular for For Can Tho City, CDIA proposed the following elements for improved wastewater system: design review of Cai Sau wastewater treatment plant, septage treatment and disposal, wastewater conveyance system, and wastewater tertiary network. These projects are expected to benefit about 389, 241 residents.

For Vinh City, CDIA recommended the pursuit of drainage infrastructure consisting of improved drainage channel (dredging, embankment, and revetment of the Vinh River), box culverts in the city center and other currently unserved locations, and new stormwater pumping station for the Rao Dung River. Meanwhile, the wastewater infrastructure will consist of wastewater interceptors and pump stations alongside Vinh River, construction of an  additional SBR (sequencing batch reactor) treatment unit at the wastewater treatment plant (WWTP) and provision of septage receiving station and treatment at the WWTP.

Finally for Hai Duong City, CDIA proposed a drainage system composed of improved and new drainage canals (dredging, embankment, revetment), box culverts, as well as new and upgraded stormwater pumping stations including retention lakes. The wastewater infrastructure meanwhile, will install tertiary networks, construct secondary treatment processes at the WWTP, and provide septage treatment at the WWTP.

These are expected to bring the level of adequate drainage in Hai Duong from the current 30% to 85% coverage. An estimated 95,000 people will benefit from reduced flooding and 87,000 people in 9 wards and communes will be served by improved wastewater collection and treatment facilities, including a safe and environmentally  suitable location to treat septage.

Prior to the conduct of the PFS in the three cities, CDIA, along with city officials prepared a long-term infrastructure investment plan (LTIIP) for 2016-2035. They also conducted workshops to line up prospective drainage and wastewater infrastructure. From that list, CDIA prepared the PFS for the selected projects.

“CDIA is pleased to help the cities of Can Tho, Vinh and Hai Duong improve their wastewater and drainage systems,” said CDIA Project Manager Stuart King. “They can now use the PFS to seek support from the Vietnamese central government and agencies such as ADB which has already marked these projects for possible support in the future” he added.

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