Operational experiences with humic substances - Sachsen ?· Company Severočeské vodovody a kanalizace,…

Download Operational experiences with humic substances - Sachsen ?· Company Severočeské vodovody a kanalizace,…

Post on 29-Aug-2019

212 views

Category:

Documents

0 download

Embed Size (px)

TRANSCRIPT

  • Operational experiences

    with humic substances

    Beyblová S., Güntherová L.

    Severočeské vodovody a kanalizace, a.s.

  • Introduction

    • Company Severočeské vodovody a kanalizace, a.s.

    • Drinking water sources Fláje and Meziboří

    • Other drinking water sources

    • Conclusion

  • Company Severočeské vodovody a

    kanalizace, a.s.

    • Our company is a leading provider of water management services in the North Bohemia ensuring the production and distribution of drinking water and sewage and waste water treatment

    • Key figures: – 1,1 million supplied customers in Ústí nad Labem and Liberec regions

    – 69 drinking water treatment plants

    – 222 waste water treatment plants

    – 1734 employees

    – Total length of water main system: 9 606 km

    – Total lenght of sewer system: 4 315 km

    • Shareholders: – VEOLIA CENTRAL & EASTERN EUROPE S.A. .... 50,1%

    – Severočeská vodárenská společnost a.s.(SVS) .... 49,1%

    • SVS – All shares are held by 458 North Bohemian towns and municipalities

    – The operation of water management assets owned by the Severočeská Vodárenská Společnost company has been entrusted, on the basis of a long-term contract, to the operating company – Severočeské vodovody a kanalizace, a.s.

  • Drinking water sources in North Bohemia

    • Surface water

    – Dams:

    • Přísečnice, Kamenička, Křímov, Jirkov, Fláje – Krušné hory

    • Chřibská

    • Josefův Důl, Souš – Jizerské hory

    – Rivers, Creeks – Bílý potok, Chomutovka

    • Groundwater

    – Litoměřice area – extraction wells

    – Problems with drought

    • Surface water quality problems – Humic substances, Manganese, Organisms

    (Merismopedia sp., Asterionella, Peridinia), odour

  • Fláje Dam

    • Krušné mountains (Erzgebirge)

    • Volume: 21 600 000 m3

    • Area: 153 ha

    • Average long term flow (Q): 805 l/s

    • Construction: concrete Noetzli type

    • Lenght of the crown: 459 m

    • Hight of the dam: 49,46 m

    • Outflow horizon for treatment: 1

  • Raw water quality - COD

    0,0

    1,0

    2,0

    3,0

    4,0

    5,0

    6,0

    7,0

    8,0

    9,0

    10,0

    1-04 5-05 9-06 2-08 6-09 11-10 3-12 8-13 12-14 4-16

    COD [mg/l]

  • Raw water quality – Humic acids

    0

    1

    2

    3

    4

    5

    6

    7

    8

    9

    10

    1-04 5-05 10-06 2-08 7-09 11-10 4-12 8-13 12-14 5-16

    Humic acids [mg/l]

  • Raw water quality – Temperature

    0,0

    2,0

    4,0

    6,0

    8,0

    10,0

    12,0

    14,0

    1-04 5-05 9-06 2-08 6-09 11-10 3-12 8-13 12-14 4-16

    Temperature (°C)

  • Treatment Plant Meziboří

    • It was built between 1954 - 1963 as part of

    comprehensive water project Fláje (Fláje dam on

    the Flájský creek, the feeder into the

    equalization tank at the end with power plant,

    water treatment Mezibori and supply system).

    • Its max capacity was 800 l/s, after reconstruction

    (2012 - 2015) it is 550 l/s (1980 m3/hour)

    • The biggest issues – humic substances,

    manganese, treatment of cold water during

    winter

    • Treatment plant supplies drinking water to the

    city of Most, Litvínov, Duchcov, Teplice, Bílina,

    and partly regional town of Usti nad Labem

    • Over 125 000 customers

  • Treatment Plant Meziboří

    Fláje Dam

    Reaction Tank

    Flotation

    Filtration

    Drinking water

    reservoir

    Lime

    Coagulant

    Flocculant

    Carbon dioxide

    Ammonium sulphate Chlorine

    Lime

    Waste water

  • Treatment Plant Meziboří - General

    reconstruction

    • The overall reconstruction in 2012 – 2015

    • Cost - 8 800 000 Euro

    • Intensification of the treatment plant was divided into two parts.

    – The first with a duration of 20 months and performance limited to 270 l/s included the

    reconstruction of the inflow building, construction of engineering buildings, reaction tanks and

    flotation, reconstruction of pumping stations, reservoirs of treated water and chemical

    management.

    – The second part with a duration of about 14 months and performance limited to 180 l/s included

    the reconstruction of the sand filtration, storage of treated water 4 x 2125 m3, completing the

    control system of technological processes and chemical management. There was also overall

    construction renovation of the treatment facility.

  • DAF – Dissolved Air Flotation

    • Dissolved Air Flotation (DAF) is a

    separation process that is included as

    the first separation stage in the

    drinking water treatment process.

    • Suspended substances (flocs,

    particles, organisms) join the air micro-

    bubbles in the contact zone to be

    brought up to the level of the

    separation zone where they form

    floating layer of a mechanicaly

    removed sludge foam.

    • High separation efficiency

  • Filtration

    • New underdrain system - Leopold®

    Type S™ technology underdrain

    • Leopold Type S Technology

    Underdrains feature closely spaced,

    non-clogging orifices for uniform

    distribution of air and/or water

    backwash. This does more than

    promote trouble-free operation. It

    cleans the media better.

    • Proven flow distribution

    • Sand - height of fill: 1,7 m

  • Přísečnice Dam

    • Volume: 46 670 000 m3

    • Area: 362 ha

    • Average long term flow (Q): 960 l/s

    • Construction: Earth type

    • Lenght of the crown: 469,7 m

    • Hight of the dam: 47,2 m

    • Outflow horizon for treatment: 4

    • Low humic acids, problems with odour

    – irregular incidence of Actinomycetes

    • DWTP Hradiště

    • Max capacity was 1050 l/s, after

    reconstruction (2006 - 2008) it is 800 l/s

    (2880 m3/hour)

    • Drinking water for Chomutov, Kadaň,

    Klášterec, Louny, Most, Teplice

    • Over 240 000 customers

  • Souš Dam

    • Jizerské hory (Isergebirge)

    • Souš DWTP max. 240 l/s

    • Drinking water for Jablonec nad Nisou

    • Over 70 000 customers

    • Humic substances, snow water, very low pH

    • Liming of the dam

    • 1st separation stage – DAF (2014)

  • Liming – cca 100 ton of lime

  • • Humic substances are a long term problem.

    • Changes of raw water quality – seasonal changes, Irregural incidence

    of organisms and others

    • Instalation of 1st separation stage (DAF) – high separation efficiency

    • Further research and cooperation of state and private sector is

    necessary

    Conclusion

  • Thank you for your attention

Recommended

View more >