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Dr. Andreas Koch

Hygienic requirements for cement-bound materials in c ontact with drinking water. Dr. Andreas Koch. Cement bound materials in drinking water supply. more then 100 years cement-bound materials in drinking water supply

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Dr. Andreas Koch

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  1. Hygienic requirements for cement-bound materials incontact with drinking water Dr. Andreas Koch

  2. Cement bound materials in drinking water supply • more then 100 years cement-bound materials in drinking water supply • For example, Infiltration buildings, Reservoirs, Drinking water treatment works, Storage reservoirs, Pump discharge pipeworks, Cement mortar linings for cast iron and steel pipes

  3. Cement-bound materials in drinking water contact Architectural requirements Water-hygienic requirements DIN EN 206-1 DIN 1045-2 DIN EN 1508 DVGW W 311 DVGW W 312 DVGW-W 300 DVGW W 347 DVGW W 270 (if organic constituents used)

  4. DVGW technical standard W 347 • first edition in October 1999 • implementation of European Standards for cement, aggregate, admixtures etc. • new knowledges of AHG 6 „Influence of cementitious products on water intended for human consumtion “ of WG 3 of CEN/TC 164 „water supply“ • as of year 2002 start with the revision of DVGW working sheet W 347, to adapt it to the state of the art and to the relevant European Standards • Mai 2006 actual edition

  5. DVGW technical standard W 347 Product test (cement mortar linings for cast iron pipe) Testing of Constituents (mortar prisms)

  6. DVGW technical standard W 347 • Drinking water hygienic requirements Requirements for Constituents Requirements for products Testing of all Constituents (f. e. Cement, Admixtures, Additives) Product test at the finished product (f. e. cement mortar linings for cast iron or steel pipes) Requirements are fulfilled

  7. DVGW technical standard W 347 • Migration test: • performing of the test pieces (mortar prisms) • storing of the test pieces according to DIN EN 196-1 (max. 28 d.) • preconditioning of the test pieces (last 8 days of storage) preconditioning water according to DIN EN 14944-1 • migration test 3 x 72 h (reference water accord. DIN EN 14944-1) • If organic Additives, Admixtures, Pigments, Fibres or Auxiliary Agents: • Testing of odour with reference water containing 1 mg/l free Cl2 • microbiological growth test according to DVGW W 270

  8. Test pieces f.e. moulded pipes or prisms 3 test steps each 24 h Preconditioning water: pH= 7,4; 222 mg/l CaCl2, 336 mg/L NaHCO3 4th. Step (72 h) Preconditioning water 5th. Step (24 h) Preconditioning water Preconditioning discard precond. water (2x) discard precond. water discard precond. water Migration test

  9. Migration test Test pieces f.e. moulded pipes or prisms (without organic constituents) Test pieces f.e. moulded pipes or prisms (with organic constituents) 3 test steps each 72 h Reference water: pH= 7,4 elect. Cond. 500 µS/cm Ca 80 mg/l 350 mg/l HCO3- SiO2 15 mg/l 3 test steps each 72 h Reference water: + Cl2 = 1,0 mg/l Neutralize chlorine Sampling and Analysis (Odour), Colour, Turbidity TOC release, Metals Odour

  10. DVGW Working Standard W 347 • Positive list (annex A ): • toxikologic assesst substances • A1 Inorganic Additions • A2 Organic Additions • A3 Admixtures-Inorganic Constituents • A4 Admixtures -Organic Constituents • A5 Pigments • A6 Fibres • A7 Auxiliary Agents • A8 Auxiliary Agents in Additions, Admixtures

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