Assessment – Design – Implementation
Wastewater requires careful treatment; a feature that is often considered as being of a lesser priority in terms of waste management. However, where care is not taken, or discharge consents are not met, the consquences for environmental protection and bottom line profit can be significant. Our products have been tried and tested under exacting conditions and are conceived for ensuring optimal environmental protection.
Ammonia Recovery Systems to Comply with Stringent Discharge Consents
If not adequately treated, 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 waste water 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.
Leachate is the liquid that passes through a landfill and is contaminated by interaction of dissolved or suspended elements. Treatment of leachate remains one of landfill engineering’s most complex problems to solve.
The WENT landfill site in Hong Kong is a major installation serving the city of Hong Kong. The site treats leachate for high levels of ammonia prior to release to the environment. The system uses waste landfill gas to provide a source of heat for the process.
- Reliable, predictable ammonia recovery
- Good for bulk removal of ammonia
- Discharge levels of less than 10 mg/l
- pH adjustment and thermal processes available
- Site specific design-for-purpose
Ammonia strippers supplied by Organics can be used for liquid flows of up to 5,000 cubic meters per day. Ammonia reduction of 10:1 can be accomplished with ease. Higher levels of removal may require elevated temperatures, high pH levels or multiple columns. With ammonium ion concentrations of over approximately 1,000 mg/litre it may be necessary to consider some form of exhaust air cleaning, either with an acid wash or by means of incineration.
- A low cost method of treating one particular aspect of leachate or other fluids polluted with the ammonium ion.
- This ammonia recovery technology will be applicable where the only parameter falling outside of a discharge consent requirement is ammonia.
- Compact plant operating on a physical treatment method and hence more reliable than biological treatment systems.
- Options to instrument the plant for remote monitoring and control.
Ammonia recovery has its place in the range of techniques applied to landfill leachate treatment where ammonia levels must be reduced but other component concentrations, such as COD and heavy metals, are within the limits of a discharge consent.
The cost of such a system will in general be low compared with other options that may be considered. The power requirement for air circulation is less than that for an equivalent aerated system and water pressure heads required will be a function of the height of the stripper column. When operated with in-line pre-filtration such units can operate for many years with very little maintenance.