Water and Wastewater Treatment: Arsenic Removal using Media G2 and Hydrogen Sulfide Removal using SULFA-BIND
Hydrogen Sulfide Removal using patented SULFA-BIND filter
Hydrogen Sulfide Removal ADI introduces a new hydrogen sulfide gas stripping process ADI has developed a new process for removal of hydrogen sulfide (H2S) from gas streams. Hydrogen sulfide is a common component in wastewater treatment plant off-gases (e.g. biogas) and waste gases from certain industrial processes. It is highly toxic and odorous, therefore its release to the atmosphere is regulated. Hydrogen sulfide is highly corrosive, which can result in costly damage to equipment and piping systems used in biogas handling. The simplest means of dealing with hydrogen sulfide removal is to burn the biogas in a flare. Unfortunately, this achieves 95% conversion to non-odorous sulfur dioxide (SO2), which typically is not sufficient to meet stringent air quality requirements. Research completed by ADI has determined our patented SULFA-BIND process will efficiently and cost effectively remove hydrogen sulfide from biogas. A bench-scale version of a SULFA-BIND™ filter was able to treat gas with a hydrogen sulfide concentration as high as 30,000 ppm, reducing it to less than 1 ppm. An on-site pilot-scale filter was able to reduce hydrogen sulfide from 60 - 100 ppm down to less than 0.2 ppm on a digester gas at a wastewater treatment plant. Hydrogen sulfide saturated SULFA-BIND ™ was also subjected to leachate testing, using both the Canadian and US protocols with the results considered non-hazardous waste. Based on the performance evaluation and economic comparison with existing technologies, hydrogen sulfide removal using SULFA-BIND filter media is a practical, viable option. SULFA-BIND consists of an inorganic, natural material, calcined to increase hardness, porosity and surface area and coated with iron oxide. Used in fixed-bed adsorber vessels, pressure loss is very low (inches of w.c.). ADI has received a US patent for its SULFA-BIND adsorption process for removal of hydrogen sulfide in gas and air streams. SULFA-BIND is proven to reduce hydrogen sulfide in biogas by up to 99.98% It can handle hydrogen sulfide removal up to 30,000 ppm It reduces hydrogen sulfide to non-detectable levels (0.2 ppm) There is a reduction in 60 seconds or less of contact time SULFA-BIND can be regenerated and residuals are non-hazardous Up to 500 mg H2S adsorbed per gram of media.
ADI introduces a new hydrogen sulfide gas stripping process
ADI has developed a new process for removal of hydrogen sulfide (H2S) from gas streams. Hydrogen sulfide is a common component in wastewater treatment plant off-gases (e.g. biogas) and waste gases from certain industrial processes. It is highly toxic and odorous, therefore its release to the atmosphere is regulated.
Hydrogen sulfide is highly corrosive, which can result in costly damage to equipment and piping systems used in biogas handling.
The simplest means of dealing with hydrogen sulfide removal is to burn the biogas in a flare. Unfortunately, this achieves 95% conversion to non-odorous sulfur dioxide (SO2), which typically is not sufficient to meet stringent air quality requirements.
Research completed by ADI has determined our patented SULFA-BIND process will efficiently and cost effectively remove hydrogen sulfide from biogas. A bench-scale version of a SULFA-BIND™ filter was able to treat gas with a hydrogen sulfide concentration as high as 30,000 ppm, reducing it to less than 1 ppm. An on-site pilot-scale filter was able to reduce hydrogen sulfide from 60 - 100 ppm down to less than 0.2 ppm on a digester gas at a wastewater treatment plant.
Hydrogen sulfide saturated SULFA-BIND ™ was also subjected to leachate testing, using both the Canadian and US protocols with the results considered non-hazardous waste.
Based on the performance evaluation and economic comparison with existing technologies, hydrogen sulfide removal using SULFA-BIND filter media is a practical, viable option. SULFA-BIND consists of an inorganic, natural material, calcined to increase hardness, porosity and surface area and coated with iron oxide. Used in fixed-bed adsorber vessels, pressure loss is very low (inches of w.c.).
ADI has received a US patent for its SULFA-BIND adsorption process for removal of hydrogen sulfide in gas and air streams.
Water Treatment and Gas Scrabbing
Arsenic Removal For highly efficient, cost-effective arsenic removal treatment from drinking water, ADI`s patented MEDIA G2 water treatment technology is capable of reducing arsenic levels to less than 2 ppb, even from concentrations as high as 1200 ppb. The MEDIA G2 technology has treated hundreds of millions of gallons of arsenic contaminated water since 1999 with this arsenic adsorption technology. Communities around the world are turning to ADI International to meet EPA and WHO guidelines. Because of the negative health effects of ingesting arsenic, the Environmental Protection Agency (EPA) and the World Health Organization have established a Maximum Contaminant Level (MCL) of 10 parts per billion in drinking water. In the USA, compliance with the EPA limit is required by January 2006. Over five percent of the community water systems in the United States which serve over 10,000,000 people require treatment to meet the new limit. Arsenic - What is it? Arsenic is a naturally-occurring element in groundwater throughout the world. It has no taste, color or odor, but its presence in drinking water can cause serious health effects. In addition to naturally occurring arsenic, which is by far the largest source, arsenic can also occur due to pesticides, mining, and computer chip manufacturing. Numerous studies have linked consumption of arsenic contaminated water to increased risk of cancer (skin, lung, and others), diabetes, and disfiguring skin conditions such as hyperkeratosis (“blackfoot disease”). Worldwide Installations ADI’s MEDIA G2® has been used worldwide since 1998. Institutional: The first installation in the United States occurred in early 1999 with the retrofit of an existing activated carbon filtration plant at Rose Hill Center, a small health care facility in Michigan. The plant consists of six 36" diameter filters; retrofit included replacement of the activated carbon with MEDIA G2® and installation of an automated pH control system to maintain filter inlet pH at 6.5. The plant has been monitored by the USEPA since start-up, and continues to reduce arsenic from 30 ppb to <3 ppb. Commercial: Two arsenic removal systems were installed at a bottled water facility in California in 1999. Each system consists of two 8' diameter stainless steel filter vessels operating in parallel, and treats 250 gpm, reducing arsenic from 10 ppb to 2 ppb. Since the filters do not alter the chemistry of the water, except removing arsenic, the water is able to maintain the important “natural spring water” designation. Municipal: The first international use of this technology occurred in March, 1999 with the installation of a 100gpm plant in New Zealand. Arsenic at this location averages 26 ppb. A plant consisting of two 5' diameter vessels was installed outdoors on a concrete slab. It operates unattended, except for backwashing every 2 - 3 months. Outlet arsenic is <5 ppb. There are now over two dozen plants installed worldwide, all reducing arsenic to less than 5 ppb.
For highly efficient, cost-effective arsenic removal treatment from drinking water, ADI`s patented MEDIA G2 water treatment technology is capable of reducing arsenic levels to less than 2 ppb, even from concentrations as high as 1200 ppb. The MEDIA G2 technology has treated hundreds of millions of gallons of arsenic contaminated water since 1999 with this arsenic adsorption technology. Communities around the world are turning to ADI International to meet EPA and WHO guidelines.
Because of the negative health effects of ingesting arsenic, the Environmental Protection Agency (EPA) and the World Health Organization have established a Maximum Contaminant Level (MCL) of 10 parts per billion in drinking water. In the USA, compliance with the EPA limit is required by January 2006.
Over five percent of the community water systems in the United States which serve over 10,000,000 people require treatment to meet the new limit.
Arsenic - What is it?
Arsenic is a naturally-occurring element in groundwater throughout the world. It has no taste, color or odor, but its presence in drinking water can cause serious health effects.
In addition to naturally occurring arsenic, which is by far the largest source, arsenic can also occur due to pesticides, mining, and computer chip manufacturing.
Numerous studies have linked consumption of arsenic contaminated water to increased risk of cancer (skin, lung, and others), diabetes, and disfiguring skin conditions such as hyperkeratosis (“blackfoot disease”).
Worldwide Installations
ADI’s MEDIA G2® has been used worldwide since 1998.
Institutional: The first installation in the United States occurred in early 1999 with the retrofit of an existing activated carbon filtration plant at Rose Hill Center, a small health care facility in Michigan. The plant consists of six 36" diameter filters; retrofit included replacement of the activated carbon with MEDIA G2® and installation of an automated pH control system to maintain filter inlet pH at 6.5. The plant has been monitored by the USEPA since start-up, and continues to reduce arsenic from 30 ppb to <3 ppb.
Commercial: Two arsenic removal systems were installed at a bottled water facility in California in 1999. Each system consists of two 8' diameter stainless steel filter vessels operating in parallel, and treats 250 gpm, reducing arsenic from 10 ppb to 2 ppb. Since the filters do not alter the chemistry of the water, except removing arsenic, the water is able to maintain the important “natural spring water” designation.
Municipal: The first international use of this technology occurred in March, 1999 with the installation of a 100gpm plant in New Zealand. Arsenic at this location averages 26 ppb. A plant consisting of two 5' diameter vessels was installed outdoors on a concrete slab. It operates unattended, except for backwashing every 2 - 3 months. Outlet arsenic is <5 ppb.
There are now over two dozen plants installed worldwide, all reducing arsenic to less than 5 ppb.
Media G2 for Arsenic Removal
MEDIA G2® ADI’s highly efficient, cost effective arsenic removal system consists of pressure vessels containing MEDIA G2®. Although MEDIA G2® water treatment system was developed for adsorbing arsenic, it will also remove iron, manganese, chromium, uranium and other dissolved metals. ADI’s MEDIA G2® is a natural compound, not a synthetic compound. It is produced in North America and consists of granular, calcined diatomite upon which ferric (iron) hydroxide is chemically bonded. Iron attracts the arsenic in water and binds it to the media by chemisorption. MEDIA G2® arsenic filtration systems work well in the pH range of 5.5 to 7.5, and unlike many other adsorbents, it is not affected by high concentrations of sulfate, chloride, iron or silica. The ADI arsenic removal system operates in a down-flow mode, typically providing 5 - 10 minutes residence time. As the media in the filters becomes saturated with arsenic, the concentration in the treated water begins to increase. Before this concentration reaches the maximum allowable contaminant level (break through), the media is either replaced or regenerated in-situ. Unlike other iron-based adsorbents, MEDIA G2® adsorption media can be regenerated 4 to 5 times, in a process which takes only a few hours. The volume of waste produced in regeneration is typically less than 0.1% of the volume of treated water. Of significance is the fact that the residuals generated from regeneration, as well as the spent media itself, are non-hazardous according to USA EPA’s TCLP test. MEDIA G2® was the first adsorbent of its type to be certified by NSF International to Standard 61. It also complies with FDA regulations, and has been performance-verified by ETV Canada (EPA/NSF ETV verification is underway in the US).
ADI’s highly efficient, cost effective arsenic removal system consists of pressure vessels containing MEDIA G2®. Although MEDIA G2® water treatment system was developed for adsorbing arsenic, it will also remove iron, manganese, chromium, uranium and other dissolved metals.
ADI’s MEDIA G2® is a natural compound, not a synthetic compound. It is produced in North America and consists of granular, calcined diatomite upon which ferric (iron) hydroxide is chemically bonded. Iron attracts the arsenic in water and binds it to the media by chemisorption.
MEDIA G2® arsenic filtration systems work well in the pH range of 5.5 to 7.5, and unlike many other adsorbents, it is not affected by high concentrations of sulfate, chloride, iron or silica.
The ADI arsenic removal system operates in a down-flow mode, typically providing 5 - 10 minutes residence time. As the media in the filters becomes saturated with arsenic, the concentration in the treated water begins to increase. Before this concentration reaches the maximum allowable contaminant level (break through), the media is either replaced or regenerated in-situ.
Unlike other iron-based adsorbents, MEDIA G2® adsorption media can be regenerated 4 to 5 times, in a process which takes only a few hours. The volume of waste produced in regeneration is typically less than 0.1% of the volume of treated water. Of significance is the fact that the residuals generated from regeneration, as well as the spent media itself, are non-hazardous according to USA EPA’s TCLP test.
MEDIA G2® was the first adsorbent of its type to be certified by NSF International to Standard 61. It also complies with FDA regulations, and has been performance-verified by ETV Canada (EPA/NSF ETV verification is underway in the US).
Water Quality Management
Water Quality Management ADI has the expertise to help any water purveyor (community, business, government) address their potable water issues and improve the water quality supplied to their customers. Our plan could help maintain confidence with your customers, regulators and insurance underwriters. Specific elements of such plans could include: Source area protection program Water system assessment report Treatment and disinfection process(es) assessment Cross connection control program By-law and financing assessment Emergency response and public relations plan Water sampling program - water quality characterization System classification - operator training assessment Groundwater under direct influence (GUDI) of surface water assessment
Waste/ Wastewater Treatment
Industrial Water Advanced Industrial Anaerobic and Aerobic Treatment Technologies for Industrial Waste/Wastewater plus Complete Design-Build Services ADI offers proprietary anaerobic and aerobic industrial waste/wastewater treatment technologies. These technologies allow us to treat almost any industrial waste stream including those which are primarily soluble to those high in suspended solids and fats, oil, and grease. We offer technology packages for overseas customers and complete design-build services in the USA and Canada. ADI also conducts treatability studies, pilot testing, bench-scale studies, operator training, and aftercare services to customers who need to anaerobically or aerobically treat industrial waste/wastewater. Although anaerobic wastewater treatment is our focus, we also offer upstream and downstream unit operations and processes to provide a complete treatment train. The technology and treatment train is custom-designed for each industrial waste/wastewater. In addition to our own proprietary technologies, we offer a host of generic unit operations and processes on a design-build or turnkey basis. Sometime we obtain spot licenses to offer proprietary technologies of third parties. Municipal Wastewater Our wastewater treatment solutions have been provided to over twenty municipal wastewater treatment plants worldwide. Activated sludge systems: can accommodate large flow streams proven technology relatively limited sparse requirements Aerated and facultative lagoons: minimum operator attention reduced sludge disposal Rotating biological contactors: small flow waste streams minimum operator attention reduced energy costs reduced sludge disposal low annual maintenance above-ground tanks or underground basins limited space requirements
Advanced Industrial Anaerobic and Aerobic Treatment Technologies for Industrial Waste/Wastewater plus Complete Design-Build Services
ADI offers proprietary anaerobic and aerobic industrial waste/wastewater treatment technologies. These technologies allow us to treat almost any industrial waste stream including those which are primarily soluble to those high in suspended solids and fats, oil, and grease. We offer technology packages for overseas customers and complete design-build services in the USA and Canada.
ADI also conducts treatability studies, pilot testing, bench-scale studies, operator training, and aftercare services to customers who need to anaerobically or aerobically treat industrial waste/wastewater.
Although anaerobic wastewater treatment is our focus, we also offer upstream and downstream unit operations and processes to provide a complete treatment train. The technology and treatment train is custom-designed for each industrial waste/wastewater.
In addition to our own proprietary technologies, we offer a host of generic unit operations and processes on a design-build or turnkey basis. Sometime we obtain spot licenses to offer proprietary technologies of third parties.
Our wastewater treatment solutions have been provided to over twenty municipal wastewater treatment plants worldwide. Activated sludge systems:
Aerated and facultative lagoons:
Rotating biological contactors:
Water Treatment, Wastewater Treatment
ADI provides consulting, design, project and construction management, environmental management, design-build services and water and wastewater treatment solutions to industries and governments worldwide.ADI began as an employee-owned company in 1945 and has grown steadily in the ensuing years. Professionals, scientists, technicians and support staff have experience working on projects in over 30 countries around the globe.Patents are held in water and wastewater treatment that are incorporated as complete treatment systems or as separate packages. It also holds patents on geomembrane cover systems and hydrogen sulfide removal from gas streams. Research and development is ongoing in the pursuit of future patents and market-driven technology.In recognition of the company`s dedication to excellence, national and regional awards have been bestowed on the company for innovation, growth, and management excellence, including the ``Canada`s 50 Best Managed Companies`` award.ADI believes in supporting the communities in which it operates. It is a regular contributor to charitable organizations, hospitals, community initiatives, and universities. It supports youth in many regions by participating in co-operative education programs, mentoring, and funds three university scholarships in perpetuity for engineering students.
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