CASE STUDY. Catenary Screen. Olecko, Poland

Installation of a Catenary Screen and a Screenings’ Wash Press at the Sewage Pumping Station (Olecko, Poland)

PROJECT Modernization of the sewage pumping station in Olecko
INVESTOR Przedsiębiorstwo Wodociągów i Kanalizacji Sp. z o. o. in Olecko
OBJECT Sewage pumping station at Batory street
STARTING December 2018 – June 2019

Plans and Modernization Goals

According to the modernization plan of the pumping station building located at Batory street in Olecko delivery of equipment was divided into two stages:

  1. December 2018 – delivery and installation of the mechanical catenary screen bar type RKC 0827 with
    6 mm clearance.
  2. June 2019 – delivery and installation of SCP 2020 type screenings wash press with Q = 2 m3/h capacity along with the necessary supporting structure.

The purpose of the modernization of the main pumping station was to increase the efficiency of
removing solid parts from inflowing sewage, as well as to reduce the amount of generated screenings
and their hydration.

State from before the Modernization

City’s sewage is directed to the pumping station’s main collecting chamber, and then goes to the grate, which is mounted in a channel with dimensions Bk = 950 mm, Hk = 2000 mm. Before the project, problems related to the presence of the wet wipes occurred, which caused diffi culties in normal gate operation and its blocking. Screenings collected on the grating were transported to the screw conveyor, through which they were transported to the collecting container. The shiſt operator then had to transport the container outside of the building and load it onto the removal vehicle. The main problems associated with the operation of the old devices were:

  • large costs related to the handling and cleaning of the grate from wet wipes and the removal of screenings with a high water content;
  • problems related with stopping the grate too oſten;
  • pump failure and operational problems at further stages of purifi cation that were caused by insufficient efficiency of solid impurities removal.

Results

Aſter analyzing the situation at the pumping station, specialists from EKOTON Industrial Group have decided to install a grid prototype to check the efficiency increment comparing to the old device. The RKC 0827 catenary screen bar has been installed at the pumping station, the very first to be produced at our plant. Aſter three months of operation, the management of the plant has decided to buy back the installed device and order SCP 2020 screenings wash press.

As a result of installation of the new equipment, the following results were obtained:

  • Thanks to the use of an innovative chain mechanism that allows efficient collection and extract of a various types of wastes and wet tissues from sewage, the number of failures associated with grid jams has been reduced;
  • The number of removed screenings has doubled due to the use of a grid with a clearance of s = 6 mm within the strainer;
  • The weight of removed screenings has been reduced over three times, thanks to the pressing and rinsing them on the SCP wash press;
  • The time necessary to operate the equipment has decreased by over 95% due to the use of a full automatic mechanical treatment line.

In addition, the following upsides related to equipment replacement should be noted:

  • A significant decrease in the number of failures and repairs at further stages of wastewater and sludge treatment;
  • Total elimination of the need to work in a manual mode when removing screenings from grates.

Conclusions

The modernization of the mechanical sewage treatment system at the pumping station allowed the organization of an effective treatment system for large and medium solid wastes, using a special construction of the grid chain. Screenings, removed from the sewage, are washed to reduce their organic content and pressed on a wash press to reduce their volume and weight.

The installed mechanical cleaning line works fully automatically and does not require constant presence of a personnel. The work of the mechanical wastewater treatment complex has fully met the requirements and ensured stable and trouble-free operation at subsequent stages of treatment.

 

CASE STUDY. Mechanical treatment. Augustow, Poland

Project brief

PROJECT – Modernization of the mechanical wastewater treatment facility

CLIENT – Wodociągi i Kanalizacje Miejskie Spółka z o. o. w Augustowie

OBJECT – Augustów WWTP LOCATION Augustów, Poland

COMMISSIONING – January 2017.

The Municipal Wastewater Treatment Plant is situated in the southern part of Augustów. Its capacity is 10 000 m3/d.

In 2016 EKOTON Company was chosen to implement investment project for the modernization of the main sewage pumping station which located at the Augustów WWTP. Within the project, the following equipment for mechanical wastewater treatment facility was produced, installed and commissioned:

  1. Rake bar screen RKE;
  2. Screw compacting press SCP;
  3. Slide gates of ZSg type;
  4. Facility control system.

The aim of the pumping station modernization was to increase the efficiency of mechanical impurities removal and waste thickening with full automation of the process.

Initial state:

In accordance with initial project, wastewater was fed via two collectors into the pumping station, where it was mechanically treated on the screens with 25 mm mesh.

Screen cloth cleaning was carried out manually by the personnel as it became clogged. The removed waste was fed into the container for its further lifting by means of lifting device to a zero mark (ground surface) into a receiving tank.

The main problems which were occurring during operation of the old equipment are following:

  • The need of constant monitoring of the screen cloth to prevent pump station flooding and emergencies;
  • High cost of the screen cloth cleaning and further waste transportation into receiving tank;
  • Pumping equipment and further stages emergencies occurring due to insufficient removal of mechanical impurities.

ekoton rake bar screen augustow poland

Project implementation:

One of the key complication during the project implementation was installation of equipment in existed pumping station among which:

The building was not designed for installation of equipment with length of more than 2,5 m, thus there was a requirement to produce rake screen with 6 m length from separate parts with length of 2 m max. Every part was mounted on supporting structure which were brought together inside the pumping station for further parts assembling inside the building.

Results:

The modernization project allowed to achieve the following results:

  1. After the new rake screens installation with 5 mm mesh, the amount of removed waste was increased by 2 times.
  2. Due to the partial waste dewatering with screw compacting press SCP, its overall mass has decreased more than 3 times.
  3. The necessary time for equipment maintenance reduced more than by 95 % due to its replacement on the new one which operates in fully automatic mode.

It should be also noted the additional advantages achieved by mechanical wastewater treatment equipment replacement:

  • Considerable decreasing of emergencies and scheduled repairs on the next stages of wastewater treatment technological process.
  • Full elimination of the need for manual labor which were necessary for waste removal earlier. It has significantly improved not only the sanitary condition at the pumping station, but also the labor conditions of the personnel.

The quantity and mass data of the waste removal from the screens in period from 2015 to 2017 is given below in figures. The pumping station modernization was carried out in the fourth quarter of the 2016 and in January 2017, the new mechanical treatment facility was launched; the data from that year indicates significant treatment parameters improvement.

Reliable screen and screw press design provide the treatment facility with a possibility of round-the-clock and trouble-free operation of equipment in automatic mode. Daily maintenance and inspection requires no more than 15 min.

ekoton rake bar screen augustow poland

The amount and mass of wastes removed from the screen in the period from 2015 to 2017

ekoton rake bar screen augustow poland

Time for equipment maintenance in minutes per day

Conclusions:

The mechanical treatment facility modernization at the sewage pumping station allowed to organize efficient wastewater treatment from large and average impurities. Removed wastes are rinsed for organic part reduction and are thickened on the screw press for its volume and weigh reduction. Installed mechanical treatment facilities operate in fully automatic mode and do not require constant personnel presence. The mechanical treatment process improvement allowed to solve all of the set challenges and assured stable and uninterrupted wastewater treatment process operation.

Reference of Wastewater Treatment Plant, Mezdra, Bulgaria

Industrial Parts Ltd., with address South Industrial Zone, P.O. 24, 6100, Kazanlak, Bulgaria, issued this Reference to EKOTON Industrial Group for successful and professional cooperation with this company.

In March 2015 at the Wastewater treatment plant in Mezdra (Bulgaria) EKOTON Industrial Group delivered and commissioned the following equipment:

  • Rake type bar screen RKE with double level sensor in the channel – 1 pcs
  • Combined mechanical treatment module M-Comby (600 m3/h) – 1 pcs
  • Sludge scraper for secondary sedimentation tank – 2 pcs
  • Central driven picket type stripper – 1 pcs
  • Slide gates (manual) – 5 pcs • Slide gates (with electric drive) – 2 pcs
  • Mechanical sludge dewatering belt filter-press – 2 pcs
  • Dewatering sludge screw conveyer KVE – 1 pcs

Since the launch of this complex all kind of equipment works stably providing a high degree of wastewater treatment. With insure qualitatively affected on the operation of wastewater treatment plant in general.

Installation of the mechanized screen allowed to increase the efficiency of the deterrence of waste and their extraction from wastewater.

The complex shows high reliability and minimum maintenance costs.

This equipment is well designed and convenient to operate. Also on the stage of mechanical sludge dewatering we used two belt filter press PL-06C with capacity 6 m3/h. For all operation period equipment under trademark EKOTON showed effective and reliable work, high corrosion resistance, low energy consumption.