The BP SBR 500 device with UV disinfection was delivered in 2020. The device is dimensioned for the treatment of municipal wastewater for 500 population equivalents (PE). 1 PE corresponds to an amount of 150 l/24 h of wastewater and a biological load (BOD5) of 60 g. The daily amount of water is 75 m3/day. Table 13 shows the input parameters of wastewater calculated on the basis of PE and on the basis of which the SBR device was dimensioned.
Hvar Star residence d.o.o., Hvar, Croatia
- M.O. Bođirković, Borovo, Croatia
- Tulumović d.o.o., Laktaši, Bosnia and Herzegovina
- Halasi Kebpro Kft, Kiskunhalas, Hungary
- E-log, Nova Pazova, Serbia
- Conex-trade d.o.o., Čaporice, Croatia
- Sardina d.o.o., Postire, Croatia
- Teši-tunolov d.o.o., Poličnik, Croatia
- Zott SEE, Gradačac, Bosnia and Herzegovina
- Mljekara Spasojević d.o.o., Bajina Bašta, Serbia
- Eko vrelo d.o.o., Beli Manastir, Croatia
- Tanasić d.o.o., Dvorovi, Bosnia and Herzegovina
- Korta Katarina, Orebić, Croatia
- Vina Grgić, Trstenik, Croatia
- Saint Hills, Zagruda, Croatia
- Model pakiranja d.d, Zagreb, Croatia
- Eko-papir d.o.o., Gola, Croatia
- Elber Kft., Kunszentmiklós, Hungary
- ADK d.o.o., Novi Travnik, Bosnia and Herzegovina
- ADK d.o.o., Hoče, Slovenia
- Hvar Star residence d.o.o., Hvar, Croatia
- Feal d.o.o., Široki brijeg, Bosnia and Herzegovina
- List of delivered biological devices for municipal wastewater treatment
- List of delivered oil separators
- Hvar Star residence d.o.o., Hvar,Croatia
- Georad d.o.o., Hrvatski Leskovac, Croatia
- Miab d.o.o., Poreč, Croatia
- Plamingo d.o.o., Gračanica, BiH
- Altrad Limex, d.o.o., Donji Miholjac, Croatia
- Grad-Export d.o.o., Vinkovci, Croatia
- Pipeline
- Tanks
- Marikomerc d.o.o., Poličnik, Croatia
- Poljorad d.o.o., Turbe, Bosnia and Herzegovina
- Pacific Ocean Kft., Vác, Hungary
- Grand Tokaj Zrt., Tolcsva, Hungary
- Smurfit Kappa Avala Ada d.o.o., Belgrade, Serbia
- LPO Ada d.o.o., Ada, Serbia
- GIKIL d.o.o., Lukavac, Bosnia and Herzegovina
- FeitianSuye d.o.o., Perlez, Serbia
- TTR Transport Kft., Kengyel, Hungary
- Odvodnja d.o.o., Zadar, Croatia
- Juhai és társa Kft., Somogycsicśó, Hungary
- Nebesa d.o.o., Hvar, Croatia
- Kala d.o.o., Starigrad Paklenica, Croatia
- U.o. Plantaža, Starigrad Paklenica, Croatia
- Miab d.o.o., Rab, Croatia
- Monter-strojarske montaže d.d., Vir, Croatia
Hvar Star residence d.o.o., Hvar, Croatia
| No. | PARAMETER | UNIT | VALUE |
| 1. | COD | kg/day | 60 |
| 2. | BOD | kg/day | 30 |
| 3. | Suspended solids | kg/day | 35 |
| 4. | Total phosphorus | kg/day | 1,5 |
| 5. | Total nitrogen | kg/day | 5,5 |
Table 13. Inlet wastewater values calculated by PE
The proposed device is a biological purifier of the second (II) stage of purification with additional UV disinfection of purified water, and the purified water can be discharged into a natural recipient (surface water). The device consists of several functional parts located in tanks made of concrete, which are installed underground and a machine room facility (steel container) which is located in the immediate vicinity of the tank. Table 14. shows the required parameters of purified water.
| No. | PARAMETER | UNIT | LIMIT VALUE | MINIMUM PERCENTAGE OF LOAD REDUCTION |
| 1. | COD | mgO2/l | 125 | 75 |
| 2. | BOD | mgO2/l | 25 | 70 |
| 3. | Suspended solids | mg/l | 35 | 90 |
Table 14. Required parameters of purified water
There is an existing pumping station on the site where the water comes by gravity and is pumped from it for mechanical pre-treatment. For mechanical pre-treatment, a compact automatic fine screw screen with integrated chamber is used and is located in a steel equipment container. The fine screen serves to separate all solid particles larger than 5 mm in diameter from the wastewater and dispose of it in an endless bag. The separated waste is collected in a municipal bin/container, and further disposed of in the manner prescribed by law. The mechanically purified water then goes by gravity to the underground biological purifier.
Figure 13. Example of a compact automatic screw screen
The biological purifier is divided into three functional parts + the outlet tank for purified water:
- Buffer tank
- SBR reactors (reactor 1 and reactor 2)
- Sludge tank (aerobic sludge stabilization)
- Purified water tank
Filling and emptying the tank is done using built-in air lift pump. Each SBR reactor is equipped with 2 blowers (1 + 1) with frequency control and a probe for measuring dissolved oxygen. While aerobic sludge stabilization was done with a blower in the tank (a special blower, 1 piece is used).
The buffer tank and both SBR reactors are equipped with submersible mixers, which are used to mix the water in the tanks.
SBR reactors operate separately and independently, and are filled alternately with wastewater from the buffer tank according to the program from the control unit.
Wastewater treatment in SBR reactors is performed in cycles:
Normal cycle:
- Filling phase – Using a pump, the wastewater is transferred from the buffer tank to the SBR reactor.
- Purification phase – Wastewater is intensively mixed and aerated by means of an aerator and supplies bacteria with oxygen. Aeration is performed at intervals depending on the program of the control unit.
- Sedimentation phase – In this phase, aeration stops, the water is stagnant and there is a separation of activated sludge (falls to the bottom of the tank) and purified water (a layer of water at the top).
- Discharge phase – When the sedimentation phase is completed, a layer of purified water is pumped out of the device and the excess precipitated activated sludge is pumped to the excess sludge tank.
These four phases form one wastewater treatment cycle.
By default, one purification cycle lasts about 8 hours.
Figure 14. SBR cycle diagram
The tank of the biological purifier is made of reinforced concrete and has a usable volume of approximately 260 m3.
Figure 15. Biological purifier
The electro-control cabinet for controlling the operation of the SBR biological purifier contains components for automatic operation of the entire plant, blower protection, and is equipped with local light and sound signalization, with the possibility of installing remote signaling and control. Management is done by PLC.
The device also includes mechanical dehydration of sludge consisting of:
- machine for mechanical dehydration of sludge
- device for preparation of aqueous solution of polyelectrolyte (flocculant)
A screw dehydrator is used for the machine sludge dehydration device. After dehydration, dehydrated sludge is obtained, with 18 – 25% dry matter, which is collected in a dehydrated sludge container.
The screw dehydrator works automatically, does not require constant staff presence, has low maintenance and operation costs. It consists of fixed and movable disks. The sludge is fed to a dosing chamber and poured into a flocculation chamber where it is mixed with the polymer and then transferred to a sludge removal unit where dehydration occurs and water is separated between fixed and movable disks into a water collection vessel.
The screw dehydrator gives the possibility to adjust the desired dry matter content. It has a self-cleaning property which reduces the possibility of clogging.
The purified water is collected in a tank and then pumped to a UV reactor where disinfection takes place. The flow of water through the UV reactor is regulated with a frequency regulator, and passes through an electromagnetic flow meter.
The UV lamp is equipped with an automatic cleaning system. The minimum lamp life is 16000 h.
Disinfected purified water from the UV reactor goes to the recipient by gravity.
Figure 16. Screw dehydrator
Figure 17. UV reactor
PARTNERË PËR DIZAJNIN 3D
PARTNERET STRATEGJIKE
