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DWA Water & Wastewater Treatment Equipment

DWA, DOWON APEX CORPORATION is a professional manufacturer that designs and fabricates advanced water & wastewater treatment equipment in South Korea; which includes: metal or non-metal chain flight sludge scraper systems, rotary automatic bar screens, mechanical coarse & fine bar screens, automatic grab screens, travelling bridge scraper systems, bridge sludge collectors, band screens, cake hoppers, belt & screw conveyors at water, sewer and wastewater treatment plants in 15 countries worldwide.

Other than that, DWA also designs and fabricates advanced incinerator plants for hazardous and municipal wastes in these countries: South Korea, Russia, Iraq and Iran.

a. Rotary Automatic Bar Screens

Automatic rotary bar screens are installed on inlet side of river water intake and pumping station to lift-up trashes and screenings automatically in raw water.
✔️ The opening of bar is 50mm mostly.
✔️ Wet parts contracting water are made of stainless steel
✔️ Double chains are also made of stainless-steel
✔️ Rotary operated chains are installed both end sides of equipment and lift trashes and screening by 4 rakes automatically
✔️ Different reduction ratio of geared drive system (cycloid) is applied
✔️ Lifting weight is 350kg/cycle
✔️ Inclination of screen is 75 degree
✔️ Pitch of screen, number of rakes, space of bars, rotation speed, and others are adjustable at the design stage of equipment, according to clients’ request

b. Mechanical Bar Screens

We supply Coarse & Fine mechanical automatic screens, double chain rakes rotation type for grit chamber.
✔️ All equipments are made of stainless steel SS304 or SS316
✔️ Main chain for rake rotation is made of stainless steel
✔️ PLC system is applied for automatic operation and interactive with auxiliary equipment
✔️ For a rake cleaning, a sludge scraper installed on the top of screen equipment
✔️ Installation inclination is 60 deg to 75 deg
✔️ Bar clearance is 25mm for coarse screens and 6mm for fine screens
✔️ Typical raking speed is 3m/min
✔️ The bar clearance, rake speed and others are adjustable according to clients’ request
✔️ A wedge bar system will be applied to fine screen to avoid clogging of screenings passing through

c. Automatic Band Screens

Automatic band screens are installed on rear flow of travelling bridge scraper system at river water intake station for potable treatment plant, to lift-up fine screenings.
✔️ Inclination of screen is 85 to 90 degrees
✔️ The equipment is consisted of stainless-steel mesh screen, rib plate, chain, drive & driven sprocket, shaft, guide and guide angle, cycloid geared type drive and reduction system
✔️ Mostly opening of mesh screen is 3 to 4mm
✔️ Driving speed of mesh screen is variable according to the inlet volume of screenings

d. Metal Chain Flight Sludge Scraper Systems

Rectangular metal chain flight sludge scraper system for high loads of sludge removal It provides higher sludge removal efficiency than any other scraper mechanism due to metal flights installed. Factors for the high loads of sludge removal are determined by:
✔️ Space of installation
✔️ Power consumption
✔️ Long duration operation

e. Non-metal Chain Flight Sludge Collectors

Non-metallic sludge collectors are mainly used for primary and secondary rectangular sludge settling tanks in sewer and wastewater treatment plants. Primary sludge settling tanks collect settled sludge by flights to sludge hopper in the end of the settling tanks and remove floated scums by the run of flights on the top of system to scum skimmers. Surplus sludge will be removed in secondary sludge settling tanks
Non-metal sludge collector has benefits shown as below:
✔️ Anti-corrosive
✔️ Ease of installation
✔️ Lightweight

Applications:
a. Sewerage Treatment Plant (STP)
b. Wastewater Treatment Plant (WWTP)
c. Water Treatment Plant (WTP)
d. Desalination plant

f. Submersible Sludge Scrapping System by Travelling Bridge

Travelling bridge scraper system installed at local sewer treatment and potable water treatment plants.
 Wide is 5 to 12 meters in one bridge for one channel or one bridge for two channels
✔️ Ideal for scrapping of heavy-duty top and bottom sludge
✔️ Forwarding speed of bridge is 0.2 to 1.8m/min, variable and reverse speed is 1.8m/min
✔️ Cycloid reduction drive system, skimmer and scraper installed to scrap top and bottom sludge
✔️ Cable reel installed

h. Automatic Grit Separators

Automatic grit separator is used to separate grit and water in grit chamber.
✔️ All materials are made of stainless steel SS304 or SS316
✔️ Screw conveyor which is used to discharge grit out is also made of stainless steel
✔️ PLC system is applied to automatic operation and interactive with auxiliary equipment
✔️ For the cleaning of sludge, a cleaning air fan system, 0.75kw is installed
✔️ The system is consisted of inlet nozzle, settling tank, inclination plate to separate the grit and water well, cleaned water drain and etc.
✔️ A water enclosure gland packing inserted to avoid leakage of settled water in the bottom of screw conveyor
✔️ Typical diameter and length of conveyor is Ø250x 4500mm

g. Circular Bridge Sludge Scarpers & Thickening Systems

The center driving or peripheral driven type of sludge scraper system will be selected according to inlet sludge flow. If the inflow capacity is bigger, or applied to sludge thickening, peripheral driven type of sludge scraper will be selected.
Surface scums will be removed by scum skimmer and sludge settled in bottom will be scraped to center hopper by bottom scraper

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