Robuschi Technology at the Service of Biological Wastewater Treatment

To improve the energy efficiency of its refluent oxygenation tanks and optimise the relative costs, WASTE RECYCLING chooses Robuschi's ROBOX evolution blower units. Roberto Boschi, in charge of the WWT plant for WASTE RECYCLING, explains the reasons behind this positive choice.

Robuschi has always been a leader in the waste water treatment sector with its range of machines: from the ROBOX evolution blower units to the new ROBOX screw – the innovative, “oil-free”, low pressure screw compressor that guarantees energy savings of up to 30% compared with traditional technologies. In recent years, the company has focused on widening its range, offering a complete package for the environment sector and also developing a specific blower unit for BIOGAS and ROBOX evolution BIOGAS applications, along with the simplified version, CRBIO. These are used as support units for feeding endothermic motors to produce energy and/or hot water, for driving gas turbines and gas burners to produce electricity, and for recirculating biogas in digesters; this means a wide range of technical solutions for our customers.

Robuschi Wastewater Applications
Robuschi Wastewater Industry

The environmental WASTE RECYCLING services

The WASTE RECYCLING group was established in Castelfranco di Sotto, in the province of Pisa, Italy. For over 20 years its companies have been working on the disposal and treatment of industrial waste. Thanks to its considerable experience built up in this sector, its highly qualified personnel, and the ground-breaking plants and equipment it uses (including a modern, fully equipped chemical analysis and research laboratory shared with university and technical institutes), WASTE RECYCLING can offer the best solutions for the correct disposal of residues produced by any type of activity. Reliability, professionalism and a fair disposal price have made this company a competitive and firm point of reference throughout Italy.


The WASTE RECYCLING plants contain a section for traditional biological waste water treatment, consisting of two refluent oxygenation tanks, reactivated with official authorization in 2009 after many years of non-use. The plant was fitted with 6 compressors using centrifugal technology, which were poorly suited to the company’s needs.

Interview with Roberto Boschi, head of the Waste Recycling sewer plant

What led you to include Robuschi products in your process? When did this come about?

«The machines we were using offered good performance levels but didn't fully meet our requirements. They weren't modular, they were extremely delicate, and they had high maintenance costs. That's why we decided, in March 2013, to install six ROBOX evolution blower units (ES 106) equipped with a noise enclosure and frequency inverter. This solution turned out to be excellent, as the system is highly flexible in terms of the amount of air used. In fact, by adapting the capacity levels to the ideal oxygenation of the system, we were able to optimise the energy costs without producing any waste: we altered the capacity from the minimum value to a maximum of 54 Hz. The involvement of Robuschi has also permitted us to maximise the space available in the compressor room, developing a practical layout and even fitting the machines with silencers. The encouraging results in relation to energy savings, along with the extremely easy use and maintenance of these machines and the quiet level of plant operation, led us to choose Robuschi for our MBR membrane biological system too; in July of this year we installed two Robuschi compressors for refluent oxygenation and two for cleaning the membranes with the aid of air and thereby preventing the risk of clogging».

Does the energy saving aspect have any effect on your decisions?

«Energy savings are one of the fundamental aspects, as the energy efficiency of the plant plays a big part in the company's management costs. The Robuschi devices help us optimise our costs and minimise waste; this is undoubtedly one of our success factors, allowing us to maintain a fair disposal price and therefore ensuring us a firm presence on the market».

In your experience, what are the current priorities when choosing one technological solution over another?

«With regards our own experience, I can definitely say flexibility, easy plant maintenance and a low impact on management and maintenance costs».

How do you imagine your sector in the near future?

«When it comes to solid waste, we'll have to adapt to the market request. There's a continuous shift from the idea of a transitory waste platform to an end disposal system for material treatment and recovery, with the ultimate goal being the use of unsorted waste to produce energy. With regards liquid waste (which, following the ever stricter regulations on industrial waste disposal, are without doubt an expanding area), we'll meet the market requirements by installing additional systems for treating any type of waste including, for instance, pharmaceutical waste with a high polluting element. A first step in that direction was certainly the fact of fitting out the chemical/physical section with a triple-action evaporation system that can manage 17,000 tonnes of waste in a year».

Robuschi throughout the World

Founded in 1941 in Parma, Italy, where the production plant is still located, Robuschi, part of Gardner Denver, Inc., has managed to develop its range over the years to meet its customers' requirements and the changing market, going from being a local workshop to a worldwide manufacturer. The push towards technological innovation and commercial expansion has continued over the decades with ever increasing attention on customer's real needs.

2010 saw a further important step, with the establishment of a new line of low pressure screw compressors. The range now includes "oil-free" compressors and blowers, vacuum pumps and systems, and centrifugal pumps for a wide variety of applications in waste water treatment and in industrial sectors.

Offering an extensive range of top quality, highly reliable products to achieve and strengthen the company's leadership in the reference markets: this is Robuschi's goal, pursued with a consistent strategy based on innovative yet flexible solutions, fully in line with the needs of customers who are supported by a widespread, highly professional sales network both while choosing the product and in the aftersale phase. Another distinguishing feature of Robuschi is its growing commitment to creating "personalised" products for differing needs and priorities; this commitment is based on the considerable hands-on experience acquired in more than 50 countries, and on non-stop technological innovation.