What are the technical requirements for water drainage and wastewater treatment in construction planning in Vietnam?
- What are the requirements for amount of wastewater produced in Vietnam?
- What are the requirements for water drainage networks in Vietnam?
- What are the requirements for wastewater treatment plants and wastewater treatment stations in Vietnam?
- What are the regulations on environment separation distance in Vietnam?
What are the requirements for amount of wastewater produced in Vietnam?
Pursuant to subsection 2.11 Section 2 of the National Technical Regulation on construction planning promulgated together with Circular 01/2021/TT-BXD, the requirements for amount of wastewater produced are as follows:
- Amount of wastewater produced shall be estimated based on series of figures on conditions and level of convenience of urban areas and residential areas, or manufacturing technology in case of industrial facilities as long as amount wastewater produced must be ≥ 80% of amount of water supplied to the same entities;
- Amount of sludge produced shall be determined based on level of completion of on-spot sanitary structures or standards selected for application but must be ≥ 0.04 m3/person/year.
What are the requirements for water drainage networks in Vietnam?
Pursuant to subsection 2.11 Section 2 of the National Technical Regulation on construction planning promulgated together with Circular 01/2021/TT-BXD, the requirements for water drainage networks are as follows:
- Newly constructed areas must plan for separate wastewater drainage system. Areas installed with general water drainage networks must plan for semi-separate water drainage systems or separate water drainage systems;
- With respect to islands, plan for separate wastewater systems and treat wastewater thoroughly, wastewater can be reused for other purposes once treated to meet environmental requirements;
- In addition, structures within water discharge network must conform to QCVN 07-2:2016/BXD.
What are the requirements for wastewater treatment plants and wastewater treatment stations in Vietnam?
Pursuant to subsection 2.11 Section 2 of the National Technical Regulation on construction planning promulgated together with Circular 01/2021/TT-BXD, the requirements for wastewater treatment plants and wastewater treatment stations in Vietnam are as follows:
- Domestic wastewater of urban areas, medical sectors, industrial parks, and craft villages must be treated to meet environmental regulations on wastewater prior to being released into receiving waters and other relevant standards. Sewage sludge of water drainage system must be collected and treated as per the law or transported to central solid waste treatment facilities;
- Location of wastewater treatment plants and newly planned wastewater treatment stations must be at the end of the current of receiving waters, at the end of primary wind direction of urban areas, and in areas with sufficient land for backup expansion. Wastewater discharge location must conform to regulations and law on managing water resources;
- In case wastewater treatment plans and wastewater treatment stations must be situated in headwaters or at the beginning of the prevailing wind of urban areas, environment separation distance under Schedule 2.22 must be multiplied by at least 1.5;
- Area of land for new construction of wastewater treatment plans and wastewater treatment stations must be identified based on treatment capacity, technology or calculated based on standards selected for application as long as the quota of 0.2 ha/1,000 m3/day is not exceeded.
NOTE: Criteria limiting area of wastewater treatment plants and wastewater treatment station do not include area of reservoirs, bodies of water for stabilizing post-treatment water, sludge drying yard, area for backup expansion (if any) and area for environment separation distance of the wastewater treatment plants and wastewater treatment stations.
What are the regulations on environment separation distance in Vietnam?
Pursuant to Section 2.11 National technical regulation on construction planning promulgated together with Circular 01/2021/TT-BXD, the environment separation distance is mentioned as follows:
- Environment separation distance of new wastewater pumping stations, wastewater treatment plans, and wastewater treatment stations is specified under Schedule 2.22;
Schedule 2.22: Environment separation distance
- With respect to wastewater pumping stations utilizing submerged pumps in cofferdams, environment separation distance is not required as long as ventilation ducts to release odors at ≥ 3 m height from the ground according to approved planning for that location are installed;
- Install isolating trees around the new wastewater treatment plans and wastewater treatment stations at least ≥ 10 m in width;
- Within environment separation distance, may only plan for traffic roads, parking lots, power supply structures, solid waste transfer stations and other structures of wastewater pumping stations and wastewater treatment stations, do not construct other civil structures;
- Currently available wastewater pumping stations, wastewater treatment plans and wastewater treatment stations that fail to meet regulations on environment separation distance must conduct environmental impact assessment to adopt additional environmental hygiene measures as per the law.
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