ASIO TECH and HSBR represent in Áraktö (Hungary)

One of such things is represented by the typified WWTP named AS-HSBR denitri, which was in the second half of the last year installed in a Hungarian municipality, Ároktö. The project was financed by the Hungarian government and the plant treats wastewater from a part of the municipality and its local grammar school. The total WWTP’s capacity was designed to 140 PE (population equivalent) with the load of 8.4 kg BOD per day.

Fig.1: Plastic tank placements in the backfilling bank without the necessity of concrete encasements

The facility consists of plastic tanks structurally reinforced for their placement in an earth fill without the necessity of concrete encasements. At the inlet section, hand operated trash racks were fixed. The process equipment was extended with the phosphorus precipitation unit and it contained the denitrification section.

Fig. 2: Backfilled WWTP tanks; final appearance of the process equipment

As the Hungarian legislation contains more strict limits for water discharged to surface streams, they were determined for these operations as follows:

BOD 25 mg/l,

COD 75 mg/l,

Insolubles 50 mg/l,

N-NH ₄ + 10 mg/l,

N _total 25 mg/l, and

P _total 5 mg/l.

In spite of extensive fluctuations in the inlet quantities, the results achieved by the WWTP supplied by ASIO met these limits without any problems. The percentual efficiency in contamination removal (i.e. the treatment efficiency) fluctuated above the 90% limit for all values with the exception of P _total . At this place, it is necessary to mention that even N _total was removed with the efficiency of more than 90%.

Diagram 1: Treatment efficiency of the AS-HSBR denitri plant

Ing. Jan Přikryl