H+E, together with its Russian affiliate OOO H+E Rus, has received the order for the modernisation of a biological wastewater treatment plant for Knauf Petroboard AG in Russia.

This modernisation of the wastewater treatment plant at “Knauf Petroboard AG” is necessary in order to improve the quality of treated wastewater and allow its discharge into fish waters. H+E has many years of experience in treating this type of waste. This, together with the presence of its subsidiary OOO “H+E Rus” and the proposed process concept for the renewal of the wastewater treatment plant all convinced the client to work with H+E. Another deciding factor was H+E’s ability to undertake the modernisation of the wastewater treatment plant to guarantee the strict limit values for purified wastewater to be discharged into a fish river at the same time as the client re-builds a board manufacturing machine.

As one of the first three steps of the modernisation measures, two new drum screens and two FLOCOMAT®.T clarifiers will be installed. In addition, the two existing pre-clarifiers will be converted into a combination of BIOFIT®.H high-load and BIOFIT®.SC low-load biological treatment stages, the ventilation station will be expanded, and the existing second-stage aeration tanks will be retrofitted with a new AEROFIT®.V ventilation system. Furthermore, a disinfection plant will be installed upstream of the purified sanitary water discharge into the river. Thus, the customer has opted for a compact solution that has been widely tested in the paper industry in the past.

The special feature of this process combination lies in the fourth modernisation step – a so-called tertiary cleaning stage. It consists of two lines of a BIOFIT®.HAC floating bed with powdered activated carbon dosing system and a FLOCOPAC® high-performance contact sludge inclined-plate clarifier, to be installed upstream of the UV disinfection. This stage makes it possible to achieve the required low discharge values. By integrating already existing components of the customer’s, the investment sum will also be reduced, which is a further advantage.

At present, design work is underway to implement the first stage, and the modernisation of treatment facilities will begin by the end of 2017.