ISO 16075-3:2021 Guidelines for treated wastewater use for irrigation projects —Part 3: Components of a reuse project for irrigation

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INTERNATIONAL STANDARD ISO 16075-3:2021

Guidelines for treated wastewater use for irrigation projects —

Part 3: Components of a reuse project for irrigation

1 Scope

This document covers the system's components needed for the use of treated wastewater (TWW) for irrigation. Emphasis is placed on irrigation methods, mainly drip irrigation, as this method represents an efficient method of irrigation and water saving, while reducing the pollution of the crops. Despite the fact that water quality and filtration of treated wastewater (herein TWW) using drip irrigation are critical, open irrigation systems are more popular and are frequently used for irrigation with TWW and therefore are covered in this document.

This document covers issues related to the main components of a TWW irrigation project, including the following:

— pumping stations;

— storage reservoirs;

— treatment facilities (for irrigation purposes);

— filtration and disinfection;

— distribution pipeline networks;

— water application devices: irrigation system components and treatment.

This document is not intended to be used for certification purposes.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 20670, Water reuse — Vocabulary

ISO 160751‑ , Guidelines for treated wastewater use for irrigation projects — Part 1: The basis of a reuse project for irrigation

3 Terms, d efinitions and abbreviated terms

3.1 Terms and definiti ons

For the purposes of this document, the terms and definitions given in ISO 20670 and ISO 16075‑1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at http://www.electropedia.org/

ISO 16075-3:2021

3.2 Abbreviated terms

BOD biochemical oxygen demand

COD chemical oxygen demand

HDPE high‑ density polyethylene

NPW non‑ potable water

PE polyethylene

PVC polyvinyl chloride

TWW treated wastewater

WW wastewater

WWTP wastewater treatment plant

4 Storage reservoir

4.1 General

TWW is sent by a transmission pipeline to the distribution centre where water is distributed to agricultural or other users.

Operational and seasonal storage facilities should be placed downstream the wastewater treatment plant to equalize daily and seasonal variations in flow from the WWTP to the distribution centre, so as to:

— meet peek irrigation demands;

— store excess of TWW entering the irrigation system in relation to irrigation demands (including winter storage); — minimize the consequences of a disruptive operation of WWTP or temporary flow of unsuitable quality of TWW to the operation of the irrigation system.

Storage reservoirs can also be used to provide additional treatment to the TWW when managers of irrigation systems need to control changes of wastewater quality that can affect the operation of the irrigation system or to increase the TWW quality.

4.2 Reservoir types

Storage facilities can be open reservoirs or ponds or closed reservoirs.

Closed reservoirs can be fixed roof reservoirs including underground reservoirs or reservoirs with removable floating cover (partial or full covered).

Closed reservoirs are more expensive, but can have several advantages:

— reduced evaporation;

— lower potential for algal growth;

— no possibility of contact of wastewater with people or animals;

— protection of stored wastewater from rainfall runoff.

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