Advanced treatment process

AOP – ADVANCED OXIDATION PROCESS

Advanced Oxidation Process is a pollutant degradation process using hydroxyl radical (*OH) as the key element. This radical is formed within the treatment process in a short period of time. OH radical is a strong oxidation potential which can react and oxidize with virtually any organic compound present in water mix. It can convert organic contaminants into other nontoxic inorganic matters such as CO2, H2O or easily decomposable compounds such as small molecular organic acid and inorganic acid.

This technology is often applied to treat wastewater with high concentration of COD and color. AOP can be used as an advanced treatment step to eliminate COD and the remaining color or as the first chemical treatment step (before the biological treatment step) to improve the BOD/COD ratio.

TThe picture below is one of the wastewater treatment plant constructed by Koastal Eco using the Fenton Advanced Oxidation Process with the capacity of 1,500 m3/day.

Advanced oxidation process in Textile Wastewater Treatment Plant

MFT – MULTILAYER FILTER TANK

This filtration system consists of pressurized filters with many filtration materials layers and many dimensions. The material arrangement can remove large suspended solids at the first material layer, and the smaller suspended solids are retained in a deeper material layer, so the removal of suspended solids is higher and turbidity is lower.

This process is typically applied in projects with high treated effluent or with recycling for a simple purpose such as irrigation, washing belt filter press.

Project scale Koastal Eco applied for a pressured filter is up to 1,500 m3/day.

MFT in the Industrial Zone Centralized Wastewater Treatment Plant

UF - ULTRAFILTRATION

UF is used for separation of suspended solids, colloids with membranes pore size between 20nm – 0.1µm under low operating pressure. This filtration step can be considered as the raw filtration step before going through RO system (if any). A typical application of this membrane is MBR technology (see also the section in Biological treatment process and Wastewater recycling process).

Application in recycling: treated effluent can be reused for road cleaning, car washing, landscape irrigation, toilet flushing.

The current recycling of water in Vietnam is often applied to only a part of the capacity of the wastewater treatment plant due to cost restrictions. The size of the UF Koastal Eco system used for water reuse is 25 m3/h.

UF filtration systems for water recycling purpose