Biological Wastewater Treatment Plants AS-HSBR (60-300 PE)

Photo: Biological Wastewater Treatment Plants AS-HSBR (60-300 PE)

AS-HSBR biological wastewater treatment plants (further as the WWTPs) continue the product ranges of WWTPs AS-VARIOcomp K and N, AS-KLARO and AS-IDEAL, well proven in practice, manufactured and operated by ASIO, spol. s r.o. since 1993. Due to our long-term experience, we are able to offer a high professional standard in the sphere of design and implementation stages of the WWTP supply in the so-called turnkey projects.

This WWTP is intended for purification of domestic wastewater produced in apartment houses, hotels, lodging houses or various facilities rendering similar services. The advantage of this WWTP consists in its easy adaptation to local conditions and the possibility to operate the plant at its capacity from 50 to 110 %. Base on non-standard requirements, we have prepared for you a WWTP that can cope with removing of NH4, Ntotal and P content parameters.

We are offering an integrated product range of wastewater treatment plants intended for purification of sewage. This WWTP can be used from 51 to 300 PE units (people equivalent). The technology solutions of these treatment plants are based on stable and reliable service at a minimal energy consumption. This technology utilises aerobic biological processes that are well proven in practice by a long-standing service. At WWTPs with the PE rating above 300, an individual design of the plant will be necessary.


  • Complex supply (all included in the price)
  • Low operating costs and energy consumption
  • High adaptability for the given service
  • High operating reliability
  • Warm-padded and lockable cover, tiltable on stainless steel hinges
  • Simple attendance and maintenance procedures of the plant
  • Due to a unique design of the SBR reactor and cleaned water draw-off by air-lift pumps, an accumulation space for newly incoming wastewater is provided
  • Simple operating settings, possibility of running at a half loading capacity of the plant
  • Customer support and servicing

Process description, plant types


Wastewater flows into the settling section of the plant, which serves at the same time as a surplus sludge reservoir. In this place, floating and sedimenting impurities are entrapped and consequently exposed to anaerobic decomposition. The pre-treated wastewater is flows to a modified activation reactor, where all phases of the purification cycle take place: aeration phase, phase of activated sludge sedimentation, cleaned water separation, and drawing the cleaned water and surplus sludge off in the end.


As compared with the previous conventional version, the PROFI type range is additionally fitted with an oxygen probe with the automatic oxygen control in the plant activation section, plus a sludge pump for the internal recycle at the period of low loading capacity of the plant, measurements of operating hours and orientation flowrate of cleaned wastewater, remote monitoring and failure alarms through SMS or a web application.


The plant is equipped with a device for phosphorus precipitation. Due to this additional process we are able to guarantee the concentration of Ptotal = 2 mg per litre at the discharge.


As compared to the basic type of AS-HSBR, this plant contains in addition a built-in pump sump, which is equipped with a sludge pump and a screen basket. Against the conventional type, the plant is by longer by one meter (max. to the size of 125 PE). The inlet pipe can be place lower that at the conventional type.


The plant is additionally equipped with the wastewater denitrification treatment stage.

AS-HSBR version


Wastewater flows into the primary tank with settling and sludge sections, where floating and sedimenting impurities are entrapped and consequently exposed to anaerobic decomposition. From the settling section, pre-cleaned water continues over an overflow, which is equipped with baffles, to the WWTP denitrification tank upstream the other processes. This tank is filled with a mixture of wastewater and activated sludge. Under anoxic conditions, the denitrification process takes place here, i.e. the reduction of nitrates contained in the water to gaseous nitrogen. In this way the AS-HSBR DENITRI plant provides not only for the reduction in the ammonia nitrogen content, but also for the total nitrogen content in wastewater. The denitrification tank is stirred continuously and for the AS-HSBR DENITRI 60÷150 sizes, the stirring is provided with coarse-bubble aeration.

For the AS-HSBR DENITRI 200÷300 sizes, a propeller stirrer is used instead of the coarsebubble aeration. From the denitrification tank, the water stream flows by gravity and over an overflow to the SBR (Sequential Batch Reactor) activation section. In the SBR activation section, chronologically sequenced processes take place as follows: biological aerobic treatment of wastewater, where the mixture is aerated intensively, activated sludge sedimentation and cleaned water separation, and finally drawing-off of cleaned water to the dicharge (by a pump).

AS-HSBR/R version

This is a self-supporting version of the WWTP for the tank installation in a half-embankment excavation and a half level of backfilling round the tanks. This solution is structurally most advantageous in terms of the elimination of external and internal forces; it is also suitable in the tank installation localities with higher levels of underground water.

AS-HSBR advantages

  • Quick installation of the plant without the necessity of concrete pouring around the tanks
  • Reduction in the scope of earth movement works with resulting savings in construction costs
  • Use of plastic tanks even in localities with higher levels of underground water
  • Preservation of the compact single-tank design for WWTP sizes up to 150 PE (up to 100 PE for the DENITRI version)