WEF Institute of Technology Inc. - World's Top Water & Waste Treatment Technology

TERRAST & ASAL Processes for Heavy Metal Treatment

TERRAST (Metallic Ion Elution Material)：The World's Best Heavy Metal Treating Material

　　

Because of a potential difference from air cell effect, current flows from charcoal to Al. As soon as aluminum cation is supplied to the water and causes hydrolysis, Al hydroxide colloid is generated.

Since this colloid is positively charged, impurities such as organic matter negatively charged in the aqueous solution are attracted electrically to the surface of Al hydroxide colloid, then attached and precipitated.

　　

ASAL Process for Treating Wastewater from TERRAST Process

＜ASAL Process Features＞
・Treat almost ANY type of inorganic residues, such as heavy metals, silica, fluorine, etc.
・Practice a low-concentration treatment (coagulation power does not decline)
・Cut down an initial cost by easy installation to your existing facilities.
・Low running cost since TERRAST is only filled every 6 months.

＜ASAL Installation Examples＞

Boron Treatment	Antimony Treatment	Fluorine Treatment

TERRAST Variations

・Fe-TERRAST

　　

In treating phosphorus and arsenic, Fe-TERRAST has shown better capability than Al-TERRAST does.
Plantlife requires ferric iron for growth. Even in nutrient-rich environments, they will not thrive without it. This explains why few phytoplankton exist in the Antarctic Sea where they cannot take enough ferric iron into their system. 　　　

Test done at a Lake Biwa freshwater pearl farm

Fe-TERRAST usage resulted in death rate reduction among shellfish, which had been 30% but by the second year was reduced to 0%.

・Mg-TERRAST

　　

A type of ion necessary for plant growth.
Effective for treating suspended solids in water. 　　　

・Cu-TERRAST

　　

Effective for quantitative sterilization. 　　　

　Water from the Himalaya Mountains often contains arsenic which is acquired as it passes through natural arsenic strata on its way down.
For this reason, high levels of arsenic are detected in groundwater of areas in some parts of China, India, Bangladesh, Cambodia, Laos, Vietnam, Thailand and Myanmar.
　Fe-TERRAST is very effective for treating such arsenic contaminated groundwater. We have already done on-site testing in Bangladesh and Vietnam.

Beaker Test

　1. Types of TERRAST to be tested

　2. Use water with 0.5mg/L of arsenic content prepared by an analysis laboratory to create the raw water for testing.

　3) Test Results

Arsenic Treatment	Raw water	3H	6H
Al-TERRAST	0.5	0.021	0.017
Fe-TERRAST	0.5	0.012	0.007
S/Fe-TERRAST	0.5	0.006	0.004

Tested at a Bangladesh University

Arsenic Treatment System

Treatment Process Flow

－Yuma Sasaya, Prof. Asano Laboratory of Ryukoku University－
At the Fukushima Daiichi Nuclear Power Station accident caused by the Tohoku Region Pacific Coast Earthquake, a vast amount of radionuclides was released into the air. Consequently, the environment of eastern Japan was contaminated by radiation. Dispersion of radioactive materials occurred not only at the directly affected area, but also other areas due to transportation of goods. One significant issue of this incident is the continuation of marine pollution even after three years, and of radioactive contamination to populated cities including the Tokyo Metropolitan area, and radionuclides reaching forest ecosystems.

Ultra Fine Bubble Generator (UFB)

UFB-A Model When combined with an oxygen generator, this model can effectively supply highly concentrated oxygen into water. This enables blower energy reduction and sludge reduction during activated sludge water treatment.

UFB-B Model When using this model for purifying rivers, canals and lakes, microbes in water and bottom soil can be activated to improve natural depuration of the environment.

Our system revitalizes the natural purification capability of rivers and canals, using fine-bubble + BFC Bacteria + Fe-TERRAST + Mg-TERRAST. *BFC Bacteria: bacillus dedicated to our developed water treatment system.

Pond purification test in Wuxi, China

　　

3 units of USB-B, 3,000 pcs of Fe-TERRAST, and 3,000 pcs of Mg-TERRAST
Test started in January, 2017 　　　

SBC Contact Material (mounted type microbe carrier)

Attached biofilm condition before setting SBC contact material	Biofilm

Structural Characteristics
・Specific surface area of filtering media is large (60 to 100㎡/?）
・Filling rate of filtering media is high (70 to 80 %)
・Volume load can be increased (volume load of fixed filter is from 0.6 to 1.2㎏BOD/?・d)

Benefits of the Process
・Enables effective treatment by encouraging cohabitant of anaerobes and aerobes.
・No sticking or clogging as seen with other contact material types (no cleaning is required)
・Reduces excess sludge

Dissolving dimethylformamide (DMF) from factory exhaust into water and then conducting SBC treatment
Wastewater treatment at a chemistry plant. No sludge for 20 years.
Patented in Japan, China and Taiwan.

Effective Reduction of Excess Sludge Using Existing Activated Sludge Treatment Method

SBC Contacting Material + UFB + BFC Bacteria

　　

Change a raw water adjustment tank or activated sludge treatment tank to organic decomposition tank.
*Pre-treating material with a rapid organic decomposition process is highly recommended in order to reduce costs. Adding micro-bubble or BFC bacteria into the biological treatment tank without any pre-treatment is possible, however it can increase running costs. 　　　

Test equipment

Oil Decomposition Treatment

　　

　Pre-treatment with oil decomposition process is essential for wastewater from food or grease factories, because significant amounts of oil may cause dysfunction of the treatment system. A pressurized flotation separation device has been commonly used for separating grease. However, the separated oil in this method is treated as industrial waste, and may cause problems such as bad odor and contamination of treatment equipment.
　SBC Treatment enables compact, low-maintenance operation through the standard activated sludge method. 　　　

Oil decomposition test

Raw water	Input UFB

Analysis data