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MBR Wasterwater Treatment

MEMBRANE BIO-REACTOR

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A robust wastewater treatment process designed to reduce maintenance

MBR (Membrane Bio-Reactor) units are a robust wastewater treatment process with inherent features designed to reduce maintenance and provide reliable and efficient wastewater treatment for small and medium scale applications.

MBR is a new wastewater treatment technology, which combines biological treatment with membrane separation. In conventional activated sludge processes, the separation of the treated water from the sludge in mainly achieved by sedimentation in the secondary clarification tank. This requires a considerable amount of space and capital cost, and the separation efficiency is low.

A robust wastewater treatment process designed to reduce maintenance

Domestic wastewater treatment / Grey water recycling

High treatment efficiency, high effluent quality and Permeate – free of suspended solids

Industrial wastewater treatment

Suitable for landfill leachate, high BOD food processing, livestock, chemical, pulp and paper wastewater.

Water reuse or recycling

Direct reuse or purified with reverse osmosis

How does it work

How does it work?

Using membrane to replace the secondary clarification tank, suspended solids can be completely removed from treated water, resulting in a high effluent quality. It not only concentrates slow-growing bacteria, but also retains large molecular organic compounds in the reactor, thereby increasing contact time with the sludge. Therefore the removal rate of COD, BOD, nitrogen and phosphorus will be greatly increased.

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Case Study

Largest Bakery in Hong Kong
The largest bakery plant in Hong Kong recently adopted Dunwell Membrane Bio-reactor (DMBR) to treat the mixed wastewater generated from their production lines and sanitary facilities.

Compared to their existing wastewater treatment plant, DMBR helps the bakery plant to save Hong Kong (HK) $240,000 per year. In addition to the annual saving, the existing wastewater treatment plant can be totally removed from the existing location, and the free space could be used as another function such as a warehouse or production floor.

The treatment plant consists of three parts: mechanical pre-treatment, the biological step and the filtration by submerged MBR membrane. After removal of the coarse particles from the wastewater by means of two automatically self-cleansing bar screens, the wastewater is fed into the aeration zone of the plant. The bacteria inside the aeration zone will digest the organic pollutants and become numerous bio-flocs (activated sludge) suspending inside the aeration zone. The biologically cleaned water will be separated from the activated sludge by the submerged membrane. With the pore size less than 1.4 micrometer on the membrane surface, no bacteria is able to pass through the membrane surface and enter the treated water stream.

Case Study
Case Study

Case Study

Hotel Greywater / Blackwater Recycling
The latest 6 star-serviced hotel in Macau recently adopted Dunwell’s MBR (DMBR) to recycle the greywater collected from their luxury rooms. The recycled greywater will be re-used as toilet flushing and irrigation purposes. Similar to the areas with limited fresh water supply, Macau’s fresh water is expensive and scarce. With the adoption of DMBR, the cost of fresh water is saved up to about 50%.

The treatment plant consists of three parts: mechanical pre-treatment, the biological step and the filtration by submerged MBR membrane. After removal of the coarse particles from the wastewater by means of an automatically self-cleansing bar screen, the wastewater is fed into the aeration zone of the plant. The bacteria inside the aeration zone will digest the organic pollutants, and become numerous bio-flocs (activated sludge) suspending inside the aeration zone.

The biologically cleaned water will be separated from the activated sludge by the submerged membrane. With the pore size less than 0.14 micrometer on the membrane surface, no bacteria can pass through the membrane surface and enter the treated water stream.

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