A decentralized concept for treatment
of heavy metal loaded wastewater from industrial areas in rural regions in Tong
Xa commune
In Tong Xa commune in the rural area of
Nam Dinh Province, countless small-scale factories, above all metal -processing,
smelting factories and galvanic factories, are currently releasing untreated wastewater
loaded with heavy metals and organic compounds into the rice fields
- The project develops a concept focusing on
the following items
- Anaerobic pretreatment of heavy metal loaded
wastewater
- Comparison of two different aerobic treatment
techniques for wastewater
- Treatment of sewage sludge in constructed wetlands
(soilization)
- Production of biomass and its subsequent processing to
energy and alcohol
- Production of service water for cooling and processing.
The anaerobic treatment plant is developed
and established as a fully working model on the scale of 1:5 for test operation in Germanyand will later be implemented in Tong Xa commune.
The main objective of the project is the implementation of an “IWRM –
Center” in Tong Xa commune consisting of the following components:
- Treatment of domestic wastewater with a wastewater
treatment plant for the equivalent of 500 inhabitants. The main treatment
target is to eliminate nutrients
- Treatment of wastewater from small-scale factories
through a combined anaerobic and aerobic-technique (as described above)
- Disinfection of treated water and its reuse as service
water in industrial processes
- Construction of a collection system for wastewater
- Treatment of sludge to produce soil and fertilizer for
the cultivation of sugar cane that eventually will be used for alcohol
production.
An integrated solution for
wastewater treatment and water reuse in an industrial area
The industrial park My Trung in Nam Dinh City is planned for 50
enterprises in different branches. The project will develop an integrated
concept for water management in the industrial park, including the following:
- Wastewater
treatment plant (screen) and mechanical pretreatment, aerobic treatment,
anaerobic treatment with production of biogas, clearing pond with rainwater
storage, hygienization of treated wastewater with ozone or UV
- Anaerobic
treatment of organic waste and production of natural gas (fermentation)
- Production
of fertilizer.
Additionally, the
following components are planned:
- Power station with biogas
engine and use of waste heat (for hot water production),
- Co-treatment of organic
solid waste in the anaerobic wastewater treatment
- Collection of rainwater and
feeding it into the clearing pond
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