ISO 16075-5:2021 Guidelines for treated wastewater use for irrigation projects —Part 5: Treated wastewater disinfection and equivalent treatments

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Guidelines for treated wastewater use for irrigation projects —Part 5: Treated wastewater disinfection and equivalent treatments由ISO于2021-06发布，适用于世界范围。

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Guidelines for treated wastewater use for irrigation projects —

Part 5: Treated wastewater disinfection and equivalent treatments

1 Scope

This document provides a guideline for the application of various available methods of treated wastewater (TWW) disinfection for an effective inactivation or removal of pathogens from TWW, which is intended for irrigation purposes.

This document deals with:

— chemical and physical technologies, principles of operation, and establishment of effective doses to be applied, possible interferences, and technical guidance for design and monitoring;

— comparison of the advantages and disadvantages of various disinfection methods suitable for TWW;

— potential environmental effects of the disinfection methodologies and ways to minimize those impacts;

— disinfection at different locations in the TWW use system, including in the wastewater treatment plant, within the distribution system and at the point of use.

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

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 the following 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/o bp

— IEC Electropedia: available at http://w ww .electropedia .org/ 3.1.1

advanced oxidation process

AOP

process that generates hydroxyl radicals in sufficient quantity to remove organics by oxidation

3.1.2

ba l l a s t

unit inserted between the supply and one or more discharge lamps, which by means of inductance, capacitance, or a combination of inductance and capacitance, serves mainly to limit the current of the lamp(s) to the required value so as to convert and regulate incoming power to UV lamps to produce UV light

Note 1 to entry: The ballast provides the proper voltage and current required to initiate and generate UV photons.

3.1.3

fouling

process leading to deterioration of membrane flux due to surface or internal blockage of the membrane

[1]

Note 1 to entry: See AWWA B130-13 .

3.1.4

pore size

size of the opening in a porous membrane

Note 1 to entry: Pore sizes are expressed either as nominal (average) or absolute (maximum), typically in terms of μm.

[1]

Note 2 to entry: See in AWWA B130-13 .

3.1.5

reduction equivalent dose

RED

dose of UV in a given device which is determined by biodosimetry

Note 1 to entry: See UV dose (3.1.9) and “biodosimetry”

Note 2 to entry: This UV dose (3.1.9) is determined by measuring the inactivation of a challenge microorganism after exposure to UV light in a UV unit and comparing the results to the known UV dose response curve of the same challenge organism determined via Bench scale collimated beam testing.

3.1.6

u ltra f i ltration

UF

Note 1 to entry: pressure driven process employing semipermeable membrane under hydraulic pressure gradient for the separation components in a solution Note 2 to entry: The pores of the membrane are of a size smaller than 0.1μm, which allows passage of the solvent(s) but will retain non-ionic solutes based primarily on physical size, not chemical potential.

Note 3 to entry: See in ASTM D6161-10.

3.1.7

U V d i s i n f e c t ion s y s t em

combination of UV disinfection units (3.1.8) with associated controls and instrumentation

3.1.8

UV disinfection unit

independent combination of single or multiple bank(s) in series with a common mode of failure (e.g., electrical, cooling, cleaning system, etc.)

3.1.9

UV dose

UV fluence

2

amount of UV energy given as the time integral of the fluence rate or irradiance (W/m )

2 2

Note 1 to entry: This is given in units of mJ/cm or J/m

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