W 130 Technical Rule - Standard 10/2007 -PDF file-

Well Regeneration

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Herausgeber/Verlag: DVGW
Format: 38 pages
Material: available as PDF only
Ausgabe: 4th edition 2007
Hinweis: German version W 130
Verkaufseinheit: 1
Mindestabnahme: 1
Artikel-Nr.: 510406

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This Code of Practice W 130 serves as a basis for the regeneration of wells and groundwater monitoring points.

Ageing processes frequently compromise water well performance, adversely affecting, in turn, a well?s service life and economic mode of operation. Well operators therefore face the dual challenge of having to identify the most appropriate regeneration methods for each specific case and being able to evaluate the success of the measures taken. Eventually, a direct capacity increase will ensure the economically efficient operation of a well over the long term only when combined with sustainably successful measures. Any well regeneration measures will, therefore, depend on the nature and scope of ageing and on the constructional condition of the well as well as on groundwater protection requirements.

This Code of Practice describes the current requirements on the technically safe and hygienically flawless implementation of well regeneration measures, points out the causes of and explains how to identify well ageing processes, among other things, and offers suggestions on how to delay them. It additionally describes the application options and limits of both mechanical and chemical regeneration procedures and/or methods.

By applying this Code of Practice, well operators and contractors alike will be able to record and trace the results achieved by the regeneration measures and evaluate their success, from the planning to the implementation and on to the final phase.

Preamble

1 Scope

2 Normative references

3 Terms and definitions

3.1 Cleaning

3.2 Regeneration

3.3 Rehabilitation

4 Introduction

5 Causes of well ageing

5.1 Iron clogging

5.1.1 General

5.1.2 Chemical clogging

5.1.3 Biological clogging (biofouling)

5.2 Silt accumulation

5.3 Corrosion

5.4 Scale deposits

5.5 Slime deposits

5.6 Aluminium precipitation

6 Determination of well ageing and preparation of regeneration measures

6.1 Determination of well ageing

6.1.1 General

6.1.2 Performance characteristics

6.1.3 Lih measurements

6.1.4 Water and deposits analyses

6.1.5 Visual inspection

6.2 Regeneration date

6.3 Regeneration capability

6.4 Associated tests

6.4.1 Well testing

6.4.2 Visual inspections

6.4.3 Geophysical measurements

7 Measures designed to delay well ageing

7.1 General

7.2 Disinfection

8 Well regeneration

8.1 General

8.2 Safety aspects

8.3 Description of a regeneration measure

8.4 Progress monitoring

8.5 Mechanical regeneration methods

8.6 Chemical methods

8.6.1 Fundamentals

8.6.2 How to carry out chemical regeneration

8.6.3 Regenerants

8.7 Hygiene measures during well regeneration

8.8 Approval by the water law authorities

9 Final measures

10 Documentation

11 Contract award

12 Bill of quantities

Annex A (informative)

Mechanical regeneration ? overview

Mechanical regeneration ? overview (contd., 1)

Mechanical regeneration ? overview (contd., 2)

Mechanical regeneration ? overview (contd., 3)

Annex B (informative) Monitoring and documentation of mechanical well regeneration ? sample form

Annex C (informative) Chemical regeneration methods ? overview

Annex D (informative) Monitoring and documentation of chemical well regeneration ? sample form

Annex E (informative) Monitoring and documentation of chemical well regeneration ? sample form

Annex F (informative) Monitoring and documentation of parameter -controlled final pump-out after chemical well regeneration ? sample form