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Reference project
Treating Polluted Washwater to Keep Garbage Trucks Clean
Introduction.
From polluted washwater to crystal-clear purity with AxoPur®
This project takes us to western Sweden, where we are partnering with a municipally owned company specializingin infrastructure and technology. This company manages essential infrastructure across the municipality of Borås, including the central city and surrounding areas. Its core responsibilities include district heating, waste management and water and sewage services.
The problem.
Garbage collection is carried out using garbage trucks, which inevitably get dirty inside due to the nature of the business. As a result, regular interior washing is necessary—not only to maintain a clean operation but also to reduce odors, bacterial contamination and promote a healthy work environment. The wastewater generated during the cleaning of garbage trucks contains a mixture of pollutants, including organic materials, oils and grease, suspended solids, and chemical contaminants.
From the outset, it was clear that treating the resulting washwater was essential for an environmental company, while cost efficiency remained a priority. To achieve this, the company opted for a cost-effective biofilter solution. However, the filter failed to effectively clean the water, leading to ongoing maintenance issues and prompting repeated yet unsuccessful attempts to improve the performance of the inadequate equipment.
The solution.
The company reached out to explore wastewater treatment solutions, and it turned out to be a profitable decision. It quickly became clear that the filter was outdated, especially given the challenging nature of the wastewater that required treatment. As a publicly owned company in the environmental sector, it is not only the company’s goal but also its obligation to set a benchmark in managing environmental responsibilities. Garbage, by nature, has an unpredictable composition, underscoring the need for a truly broad-spectrum cleaning technology.
The AxoPur system appeared to offer exactly the features the company was looking for. Through electrocoagulation, AxoPur effectively removes transition metal ions and oil contaminants simultaneously, transforming black, polluted washwater into crystal-clear, purified water in a single step. Green electricity powers the process.
Mellifiq delivery
Containerized AxoPur system with a capacity of 2 m³/h, featuring AxoPur reactors (2 m³/h each) for redundancy and a flotation unit
Energy consumption
1.5 kWh/m³
Performance:
Cadmium <100%, Lead <100%, Zinc 99%, Copper 99%, Chromium 95%, Oil index 75%
Evaluation.
By upgrading to the AxoPur containerized system, our client successfully resolved the challenge of cleaning polluted washwater from garbage trucks. The AxoPur system met the company’s needs by efficiently removing transition metal ions, emulsified oils, and other contaminants from the washwater in a single step, with a flow rate of 2 m³/h. The system delivered impressive results, including near-total removal of cadmium and lead, along with significant reductions in zinc, copper, chromium, and oil.
This successful implementation not only enhanced regulatory compliance but also set a new benchmark in the waste management industry, providing a longterm solution that improves operational efficiency while reinforcing the company’s commitment to environmental responsibility.
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