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ammonia

Treament Technology

By not ensuring adequate ammonia treatment, high levels of nitrate in water can have a significant environmental impact

One of the principal contaminants that must be treated in landfill leachate, and in wastewater in general, is ammonia. Ammonia-N in normally present in waste water or in leachate in several forms. Treatment is therefore essential.

Visit our website on leachate treatment for more information.

Contaminated Water

Ammonia Treatment Technology
Advanced Thermal Ammonia Stripping

Leachate generation is a major problem for municipal solid waste (MSW) landfills and causes a significant threat to surface water and groundwater.

Leachate can be defined as a liquid that passes through a landfill and ends up contaminated by interaction of toxic dissolved or suspended elements. Treatment of leachate remains one of landfill engineering’s most complex problems to solve.

Advanced Thermal Ammonia Stripping

Ammonia Stripping

Thermal stripping provides a low cost alternative to the use of carbon addition in a biological process. The thermal-stripper breaks the ammonium-ion bond with heat alone. This action converts ammonia into a gas, NH3, which can be driven from the liquid-phase with suitable quantities of air. In a single pass it is possible to achieve greater than 98.5% removal of ammonia by this mechanism.

Organics has developed a low-NOx combustion process for flaring waste gas which involves Exhaust Gas Recycle. When combined with the thermal destruction of ammonia gases the result is extremely low NOx emission levels. Heat from the thermal-oxidiser used to destroy ammonia is recovered in conventional heat-recovery economisers and used to power the thermal ammonia stripper.

Ammonia Recovery – Acid Scrubber

The Advanced Thermal Ammonia Stripper with Ammonia Salt recovery has been developed and patented by Organics to provide a fundamental option for disposing of or benefiting from, ammonia removed from wastewater streams. The ATASAS process provides the option of salt recovery by using acid in the scrubber. Typically, nitric, sulphuric or phosphoric acid may be used to create the ammonium ion salt. In this arrangement, a thermal oxidiser for ammonia-gas destruction is not required.

The single important input remains waste-heat with which to drive fracturing of the ammonium ion into ammonia gas. Heat is required for heating the feed into the ammonia stripper. Such waste heat can be taken from any suitable source, such as a gas engine’s exhaust, excess process steam or any other heat-source where energy is available for disposal. Once the process is commenced, the exothermic reaction encountered in salt formation offers the potential of significant energy savings.

Thermal stripping provides a very low-cost alternative to the use of carbon-source addition in a biological process. The thermal-stripper breaks the ammonium-ion bond with heat alone. This action converts ammonia into a gas, NH3, which can be driven from the liquid-phase with suitable quantities of air. In a single pass, it is possible to achieve greater than 98.5% removal of ammonia by this mechanism.

Ammonia Recovery – Water Scrubber The Advanced Thermal Ammonia Stripper with Ammonia Recovery has been developed and patented by Organics to provide another option for disposing of, or benefiting from, ammonia removed from wastewater streams. The ATASAR process provides the option of either ammonia recovery as an anhydrous liquid under pressure, or as ammonium hydroxide, held in water. The thermal oxidiser is replaced by a cold-water scrubber. The single important input remains waste heat with which to drive the chemical reactions. Heat is required for both heating the feed into the ammonia stripper, as well as to drive the absorption chiller serving the cold-water scrubber. Such wasteheat can be taken from any suitable source, such as a gas engine’s exhaust, excess process steam or any other heat-source where energy is available for disposal. Thermal stripping provides a very low-cost alternative to the use of carbon-source addition in a biological process. In many instances, savings can be measured in six digits USD when taken over the lifetime of a project. The thermal-stripper breaks the ammonium-ion bond with heat alone. This action converts ammonia into a gas, NH3, which can be driven from the liquid-phase with suitable quantities of air. In a single pass, it is possible to achieve greater than 98.5% removal of ammonia by this mechanism.

a technological approach

In the execution of any project for the removal of ammonia, Organics employs technology specifically developed for the treatment of large amounts of contaminated leachate. However, our ammonia treatment systems can be adapted to any scale or chemical loading.

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Assessment

The first step is the assessment of a particular situation. There are several different approaches to treating leachate and it is important to adapt.

Proposal

Armed with all the relevant details our engineers propose several options for treatment technology; a balancing act between cost, logistics and common sense.

Design

Once the proposal has been adapated to the circumstances, the design of the system is implemented. As these are usually bespoke systems, attention to detail is paramount.

Fabrication

The project moves to the workshop and our skilled technicians commence fabrication to specific design criteria ensuring that quality remains foremost.

Installation

Working closely with local contractors our engineers plan every detail of construction, installation and commissioning; always ensuring high standards in quality and safety.

Operation

The principal objective is to ensure an effective long-term solution for leachate treatment. As such, we also ensure that post-installation operation and maintenance is second to none.

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