ISO 18749:2004 PDF
Water quality — Adsorption of substances on activated sludge — Batch test using specific analytical methods
Water quality — Adsorption of substances on activated sludge — Batch test using specific analytical methods
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 15
- Дата публикации:
- 3 февраля 2004 г.
- Издание:
- ISO IS 18749 edition 1 version 1
- ICS:
- 13.060.70
ISO 18749:2004 specifies a screening test method for the determination of the degree of adsorption of substances on to the activated sludge or primary sludge in a waste water treatment plant. The conditions described in this International Standard normally correspond to the optimum conditions for the adsorption to occur at the chosen activated-sludge concentration and water hardness during the test period. The method applies to substances for which an analytical method with sufficient accuracy is available and which, under the conditions of the test and at the test concentration used, are water-soluble; or, if only slightly water-soluble, allow sufficiently stable suspensions, dispersions or emulsions to be prepared; are not significantly removed from the test solution during the test by known abiotic processes such as stripping or foaming; do not deflocculate activated sludge; are not readily biodegradable.
Abstract
Overview
ISO 18749:2004 - "Water quality - Adsorption of substances on activated sludge - Batch test using specific analytical methods" - specifies a laboratory screening method to determine how much of a chemical is removed from wastewater by adsorption onto activated or primary sludge. The standard describes a controlled aqueous batch test (normally 24 h) using substance‑specific analytical methods to measure concentrations at the start, during and at the end of the test and to calculate the degree of adsorption, distribution coefficient and mass balance.
Key topics and technical requirements
- Scope and applicability: Applies to water‑soluble substances, or those that form stable suspensions/emulsions, that are not readily biodegradable, do not deflocculate sludge, are not removed by abiotic processes (stripping/foaming) and for which accurate analytical methods exist.
- Test system: A buffered inorganic test medium is prepared (stock solutions for phosphate buffer, Mg2+, Ca2+ and HCO3−) with adjustable hardness to match local wastewater conditions (example: 2.5 mmol/L hardness ≈ 80 mg/L Ca, 12 mg/L Mg).
- Activated sludge: Sampled from a functioning biological wastewater plant, washed and adjusted to a suspended solids concentration-typically 1.0 g ± 0.1 g SS/L. Sludge quality checks include floc structure, SVI (
Технические детали
- Технический комитет
- ISO/TC 147/SC 5 - Biological methods
- SKU
- ISO 18749:2004
Похожие стандарты
Другие стандарты ISO
ISO 8689-1:2000
ДействующийWater quality — Biological classification of rivers — Part 1: Guidance on the interpretation of biological qu…
Overview ISO 8689-1:2000, titled Water quality - Biological classification of rivers - Part 1: Guidance on the interpretation of biological quality data from surveys of benthic macroinvertebrates, is…
ISO/ASTM51540-04(2012)
ОтменёнStandard Practice for Use of a Radiochromic Liquid Dosimetry System (Withdrawn 2020)
Significance and Use4.1 The radiochromic liquid dosimetry system provides a means of measuring absorbed dose in materials (5-7). Under the influence of ionizing radiation, chemical reactions take pla…
ISO/ASTM51204-04
ДействующийStandard Practice for Dosimetry in Gamma Irradiation Facilities for Food Processing (Withdrawn 2013)
Significance and Use4.1 Food products may be treated with ionizing radiation, such as gamma-rays from 60Co or 137Cs sources, for numerous purposes, including control of parasites and pathogenic micro…
ISO/ASTM51431-05
ОтменёнStandard Practice for Dosimetry in Electron Beam and X-Ray (Bremsstrahlung) Irradiation Facilities for Food P…
Significance and Use4.1 Food products may be treated with acceleratorgenerated radiation (electrons and X-rays) for numerous purposes, including control of parasites and pathogenic microorganisms, in…
ISO/ASTM52628-20e1
ДействующийStandard Practice for Dosimetry in Radiation Processing
1.1 This practice describes the basic requirements that apply when making absorbed dose measurements in accordance with the ASTM E61 series of dosimetry standards. In addition, it provides guidance o…
ISO/ASTM52921-13(2019)
ДействующийStandard Terminology for Additive Manufacturing—Coordinate Systems and Test Methodologies
Significance and Use 3.1 Although many additive manufacturing systems are based heavily upon the principles of Computer Numerical Control (CNC), the coordinate systems and nomenclature specific to CN…
ISO/ASTMTR52917-EB
ДействующийAdditive Manufacturing — Round Robin Testing — General Guidelines
This document outlines the steps with regard to aspects of design to conduct and run a round robin study (RRS) to assess the degree of variability in an additive manufacturing material or process. Th…
ISO/ASTM52901-17(2023)
ДействующийStandard Guide for Additive Manufacturing – General Principles – Requirements for Purchased AM Parts
Scope 1.1 This document defines and specifies requirements for purchased parts made by additive manufacturing. 1.2 It gives guidelines for the elements to be exchanged between the customer and the pa…