BENECKO - STEPANICKA LHOTA WWTP and sewage system

Transcription

1 BENECKO - STEPANICKA LHOTA WWTP and sewage system THIS PROJECT WAS CO-FINANCED BY THE EUROPEAN UNION - THE COHESION FUND, THE STATE ENVIRONMENTAL FUND UNDER THE OPERATIONAL ENVIRONMENT PROGRAMME. Chemical management Breaking chamber at the inlet Screens Sand Sludge tank Since the village is located in the rd zone of the National park, the intensification of a wastewater treatment plant (WWTP) was a demanding application. That is why for the first time in the Czech Republic the very modern technology of the membrane bioreactor (MBR) was used, which was for the treatment of municipal wastewater. The purified water has to achieve a high quality level and with the removal of suspended solids and pathogens, meets the very strict limits 75/160/EHS EU directive on bathing water. Another reason for choosing this technology was the ability to position the new technology into existing reservoirs and operational buildings, and at almost double the original capacity. This wastewater treatment plant was put into operation in 2012.

2 THE OWNER, INVESTOR: VODOHOSPODARSKE SDRUZENI TURNOV OPERATOR: SEVEROCESKE VODOVODY A KANALIZACE, a.s. THE CONTRACTOR: SYNER VHS VYSOCINA, a.s. CONTRACTOR TECHNOLOGICAL PART: ENVI-PUR, s.r.o. Benecko is located in a protected area KRNAP (rd zone), in the CHOPAV Mountains and PHO third degree of public drinking water sources. The WWTP is located in the recreation area, where a varied number of temporary residents and holiday makers spend the winter and summer months. Permanent residents throughout the year in Benecko is about 50, and in the holiday season it can reach up to Benecko had established a system of public sewerage systems. These were built from the 1980's up to the beginning of the 1990's. The main part of the original sewage plant was t 570 m above sea level, implemented in a brick building in which were installed two small WWTPs packaged sewage type II / ks with the relevant machinery and technological equipment, arranged in two lines. Excess sludge was thickened and stored in the sludge tank (capacity 80 m ), offset sludge was transported for further processing at the wastewater treatment plant CUTISIN. The main weaknesses were: 4Lack of capacity activation and secondary settling tanks, due to the reduced effectiveness of the winter holiday season and during periods of high influent wastewater, the maximum hydraulic capacity of the WWTP was only 2.5 L/s, the necessary capacity during the holiday season was three times this. 4Clogging manual intake screens and consequently bypass the WWTP 4Lacked an effective sand 4Insufficient aeration at maximum load 4Insufficient capacity electrical connections (according to the operator) 4No automatic measuring of the flow of wastewater The WWTP in Benecko - Stepanicka Lhota is a reconstructed mechanicalbiological treatment plant with activation for partial nitrification and membrane filtration for separation of activated sludge driers. Compared with normal activation cleaning eliminates the need for secondary settling tanks and other treatments such as UV disinfection, sand filtration, etc., as the particles, bacteria and virtually almost all viruses are retained in the membranes. Thus in one operational process, achieves high effluent quality, which enables the reuse of treated water. Membrane filtration of purified water and free of solid particles and germs meets the quality requirements of the EU 75/160/EHS for bathing water. The original tanks for biological treatment are divided spaces for nitrification and sludge separation using the MBR. This segmentation is raw water to prevent contact with the membrane and also in the case that the chemical cleaning tank may not be completely drained and filled with cleaning chemicals.

3 Delivered at the wastewater treatment plant were the complete plate membrane modules 400 BC, for the Czech and Slovak republics which were provided by ENVI-PUR, s.r.o., with a backwashing membrane laminated to a nationwide carrier, including facilities for washing the air with fine bubble membrane tube aerators. Excess sludge is maintained in an aerobic state that has been added to the existing sludge tank for aeration. Excess sludge is thickened by gravity for discharging waste water into the building sand. Other sludge disposal addressed to the WWTP is sent to Jilemnice for further processing. WWTP was also for the elimination of phosphorus chemical dosing ferric sulphate. The Reconstruction of WWTP from used the modern technology and has been designed for all-year-round operation. Part of this project was the construction of a sewer under Hancova shed 1.66 km in length with 2 connection points. The total construction cost amounted to CZK 20.8 million (of which 12.6 million CZK was for the reconstruction of the WWTP). Subsidies for construction - the European Union and the Czech Republic CZK 14.7 million, SEF CZK 0.8 million, the rest by VHS Turnov. Š0 ŠI ŠII ŠIII ŠVI ŠV 08.1 ŠIV Situation List of building objects: 01.1 Breaking chamber at the inlet 06.1 Power points 01.2 Chemical management 07.1 Fencing 02.1 WWTP 08.1 The asphalt surface 0.1 Sludge tank 08.2 Gravel surface 04.1 Pipe lines, specific shafts 08. Concrete paving The cable routes 09.1 Field and landscaping

4 Simplified block diagram of WWTP Benecko - Stepanicka Lhota Recirculation pump Sulphate tank Grease Pump excess sludge Membrane modules Chemical management Permeate tank Sand Mechanical screens Breaking chamber at the inlet Blowers Compressor Sludge tank Flow measurement Zalsky stream (stream Lhotecky) Grease Pump excess sludge Recirculation pump Blowers Membrane modules List of piping Raw water Emergency bypass Purified water Sludge Sludge water Air Chemicals Design capacity of the WWTP PE (population equivalent) Q 24 = 2,5 m /d max.h max.bio Q =,1 m /h Q = 7,5 m /h The quality of water Parameter p m actual* BOD5 mg/l CODCr mg/l SS mg/l 0 40 Ptotal mg/l ** 8 p permissible m maximum values which must not be exceeded < <15 < 2,5 * actual achieved values within the trial operation period 12/2011-5/2012 ** arithmetic average concentrations over the last 12 calendar months shall not be exceeded

5 BIO-CEL BC 400 Ultrafiltration membrane module Supplier: ENVI-PUR, Ltd Basic characteristics: 4Filtration area of 400 m 2 4Pore size of 0.04 micron 4Material permanent hydrophilic polyethersulfone (PES) 4Safe barrier for suspended solids and microorganisms 4Long life (high chemical and mechanical resistance) Benefits, lower operating costs, stable operation, and increase in the life of the membrane modules: 4Plate modules are resistant to clogging of fibrous debris 4Full-lamination filtering the entire surface with minimal pressure loss 4High areal density module 4Self repair from mechanical damage of the membrane 4Cassette system allows easy installation and flexible mounting plates 4BC membrane module design allows full backwash (at a pressure of 15 kpa), in combination with doses of chemicals (CEB), which significantly eliminates the fouling of membranes 4Newly developed MCP using plastic granulate is used to further reduce the fouling of membranes (MCP system is used on one line) 4Fine-bubble aeration system, which is part of the module, reduces the operating costs of aeration of the activation tank Vodohospodarske sdruzeni Turnov Antonina Dvoraka Turnov tel.: fax: info@vhsturnov.cz Severoceske vodovody a kanalizace, a.s. Oblastni zavod Turnov Vodarenska Jilemnice tel.: fax: info@scvk.cz SYNER VHS Vysocina, a.s. Na hranici Jihlava tel.: fax: info@vhsvysocina.cz ENVI-PUR, s.r.o. Na Vlcovce 1/ Praha 6 Dejvice tel.: fax: info@envi-pur.cz