GB/T 41968-2022Treatment and disposal methods for emulsifying waste liquid (English PDF)
乳化废液处理处置方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 30, 2022
Implementation date
July 1, 2023
Scope
GB/T 41968-2022 is the English-translated version of 乳化废液处理处置方法.
GB/T 41968-2022 sets out the treatment and disposal methods for emulsified waste liquid and the environmental protection requirements that accompany them.
Emulsified waste liquid is defined as the oil/water or hydrocarbon/water emulsion mixtures produced in metal processing and surface treatment, petroleum refining and processing, aluminium rolling and other non-specific industries.
The first method it describes is oil separation - air flotation - oxidation - biochemical treatment, suitable for waste liquid with a chemical oxygen demand (CODCr) less than 50000 mg/L: the liquid is degreased in a grease trap, dosed with coagulant and floated, then Fenton-oxidised, neutralised and press-filtered to drop the sludge before biochemical treatment.
It quotes GB 8978 for wastewater discharge, GB 16297 for air pollutants and GB/T 19923 for reclaimed water. Issued on 30 December 2022, it has applied since 1 July 2023.
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Document preview — GB/T 41968-2022
National Standard of the People's Republic of China
- ICS
- 13.030.20
- Classification
- Z 05
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Disposal methods
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting.
1 Scope
This document specifies the treatment and disposal methods and environmental protection requirements for emulsified waste liquid.
This document applies to the treatment and disposal of emulsified waste liquid.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB 8978 Comprehensive Wastewater Discharge Standard
GB 16297 Comprehensive Emission Standard of Air Pollutants
GB/T 19923 Industrial water quality for urban sewage recycling
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Emulsifying waste liquid
Oil/water, hydrocarbon/water emulsion mixtures produced in metal processing and surface treatment, petroleum refining and processing, aluminum rolling and other non-specific industries Combine liquid.
4 Disposal methods
4.1 Oil separation-air flotation-oxidation-biochemical method
4.1.1 Scope of application
It is suitable for emulsified waste liquid with chemical oxygen demand (CODCr) less than 50000mg/L.
4.1.2 Method summary
The waste liquid is discharged into the grease trap, and the floating oil in the waste liquid is separated by means of gravity separation. Add coagulant to the waste liquid after isolation and degreasing, The air flotation system is used for further treatment, so that the oil droplets and flocs in the wastewater collide with a large number of highly dense ultra-micro bubbles released by the air flotation equipment Adhesion to form air-bearing scum, and oil-water separation is achieved under the action of air flotation. The waste liquid in the lower layer is then oxidized to further improve the waste liquid's reliability.
Biochemical, the wastewater after Fenton oxidation is neutralized and press-filtered to remove the sludge, and the wastewater is discharged up to the standard by biochemical treatment.
4.1.3 Process flow
The process flow of oil separation-air flotation-oxidation-biochemical treatment of emulsified waste liquid is shown in Figure 1.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB 16297-1996 — Integrated emission standard of air pollutants
GB 8978-1996 — Integrated wastewater discharge standard
GB/T 19923-2024 — Reuse of urban recycling water - Water quality standard for industrial uses
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