REFERENCES

During reconstruction of sewage treatment facilities in Herzliya in 2009 a new biological reactor, consisting of three sections of 6000 cubic meters each with an operating height about 6 m, was installed. Air is pumped by means of three air blowers of 6000 cubic meters each through disc diffusers. Soon after launching it was obvious that all system is highly uneconomical. In order to keep oxygen concentration at 1.5-2.0 mg/l we had to work continuously with two-three air blowers (9000-13000 cubic meters) for the whole reactor and it was not always effective.

At the beginning of 2013 rupture marks were detected on some diffusers and we decided that it is time to replace them with something more effective. We issued a tender, and one of many offers we have received for consideration contained information about aerators of Esmil Company. There were a lot of cons: unknown company, lack of experience of work in Israel, disagreement of designers and technical advisors.

However, despite of some concerns and doubts we decided to install these particular aerators. This product attracted us by its simple and reliable design, price, mechanical strength, longevity, 8-year warranty, no need for service checks, easy and quick installation, and also a very tempting offer of company management: possibility to pay the major amount of money only in case if we are fully satisfied by their operation, which can be done even in six months. In November 2013 we launched the first section of the reactor with Esmil tubular aerators. Reality has exceeded our most optimistic expectations. Quantity of used air has been significantly reduced as well as quantity of consumed energy. Saturation of liquid with oxygen has become more stable and homogenous in the whole basin.

In 2 months instead of previously agreed 6 months of aerators’ performance observation it was decided to replace diffusers installed in two remaining sections with Esmil aerators, which was done in stair step order. Today the whole reactor (3 sections) functions with installed Esmil aerators, and we are extremely satisfied with obtained results. Required oxygen concentration (about 2 mg/l) is kept in all sections with much less energy consumption. The most part of the day (14-16 hours) we use one air blower (4500 cubic meters) and during peak hours (8-10 hours) two air blowers (instead of 2-3 air blowers used previously, before replacement of aerators). I send you the reactor operation schemes made before and after replacement of aerators.

Északmagyarországi Regionális Vízművek ZRt. / Northern Hungary Regional Sewage Plant ZRt.

Reference letter

Equipment: Multi-Disc Screw Press MDQ-353C Esmil

Location: WWTP, Sechin, Hungary

Start-up date: December 2014

Since the Multi-Disc Screw Press MDQ-353C was launched by Esmil Industrial Group, the equipment performance is faultless, it works stably and without interruptions.
During the operation of the equipment it turned out that:

• inlet sludge with dry solids content of 1 % after the Esmil dewatering Screw Press, becomes of 18-22 % while ensuring compliance with the filtrate quality regulations;
• the equipment works completely in the automated mode, the control cabinet is equipped with a touch screen by means of which it is easy to set the operational parameters not only of the dehydrator, but also of the sludge pump;
• the equipment works stably in automatic mode, without the need of operator intervention during operation; the equipment works noiseless;
• the equipment works reliably and flawlessly: within 3 years of operation, only flexible hoses for rinsing water have been replaced.

13th November 2017, Kazincbarcika

Északmagyarországi Regionális Vízművek ZRt. / Northern Hungary Regional Sewage Plant ZRt.

Reference letter

Equipment: Multi-Disc Screw Press MDQ-352C Esmil

Location: WWTP, Ozd, Hungary

Start-up date: September 2015

Since two Multi-Disc Screw Presses MDQ-353C were launched by Esmil Industrial Group, the equipment performance is faultless, it works stably and without interruptions. Discharging the cake from dehydrators takes place by screw conveyors also produced by Esmil.

During the operation of the equipment it turned out that:

• inlet sludge with dry solids content of 1 % after the Esmil dewatering Screw Press, becomes of 18-20 % while ensuring compliance with the filtrate quality regulations;
• the equipment works completely in the automated mode, the control cabinet is equipped with a touch screen by means of which it is easy to set the operational parameters not only of the dehydrator, but also of the sludge pump and screw conveyors for cake transporting;
• the equipment works stably in automatic mode, without the need of operator intervention during operation; the equipment works noiseless;
• the equipment works reliably and flawlessly.

13th November 2017, Kazincbarcika