Detail of CJ/T 264-2018

Introduction of CJ/T 264-2018

Membrane fine bubble diffuser for water and wastewater treatment 1 Scope This standard specifies the terms and definitions, classification and models, requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of bubble diffuser for water and wastewater treatment (disc type, tube type and plate type). This standard is applicable to the manufacturing and inspection of bubble diffusers for water and wastewater treatment. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 528 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties GB/T 529 Rubber vulcanized or thermoplastic - Determination of tear strength (Trouser, angle and crescent test pieces) GB/T 531.1 Rubber vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness) GB/T 1040.1 Plastics - Determination of tensile properties - Part 1: General principles GB/T 1040.2 Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and extrusion plastics GB/T 1220 Stainless steel bars GB/T 1447 Fiber-reinforced plastics composites - Determination of tensile properties GB/T 1449 Fibre-reinforced plastic composites - Determination of flexural properties GB/T 1633 Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST) GB/T 1681 Rubber - Determination of rebound resilience of vulcanizates GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids GB/T 1843 Plastics - Determination of izod impact strength Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability) GB/T 3398.1 Plastics - Determination of hardness - Part 1: Ball indentation method GB/T 3452.1 Fluid power systems - O-rings - Part 1: Inside diameters, cross-sections, tolerances and size identification code GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated aging and heat resistance tests - Air-oven method GB/T 5782 Hexagon head bolts GB/T 5836.1 Unplasticized poly(vinyl chloride) (PVC-U) pipes for soil and waste discharge inside buildings GB/T 5836.2 Unplasticized poly(vinyl chloride)(PVC-U) fittings for soil and waste discharge inside buildings GB/T 6170 Hexagon nuts, style 1 GB/T 7759.1 GB/T 7759 (all parts) Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At normal temperature and high temperature GB/T 10009 Acrylonitrile-butadiene-styrene (ABS) plastics extrusion plates GB/T 17219 Standard for safety evaluation of equipment and protective materials in drinking water system GB/T 20207.1 Acrylonitrile-butadiene-styrene (ABS) pressure piping systems - Part 1: Pipes GB/T 20207.2 Acrylonitrile-butadiene-styrene (ABS) pressure piping systems - Part 2: Fittings CJ/T 475 Measurement of oxygen mass transfer in clean water far fine bubble diffuser JB/T 8870 Hose clamp 3 Terms and Definitions For the purposes of this document, the following terms and definitions apply. 3.1 membrane fine bubble diffuser gas (usually air) diffuser, consisting of a rubber diaphragm and a support body, that can produce bubbles with a diameter of less than or equal to 3mm in water in the aeration conditions. The holes on the rubber diaphragm open when air passes through the rubber diaphragm; the holes close when the air supply is stopped 3.2 standard conditions condition where the atmospheric pressure is 101.325 kPa and the water temperature is 20 ℃ 3.3 standard oxygen transfer rate (SOTR) mass of oxygen transferred by a bubble diffuser to water with a zero dissolved oxygen concentration per unit time in the standard state and test conditions, expressed in kg/b 3.4 standard oxygen transfer efficiency (SOTE) percentage of the mass of oxygen transferred by a bubble diffuser to water per unit time to the oxygen supply to the bubble diffuser in the standard state and test conditions, expressed in %. 3.5 standard aeration efficiency (SAE) mass of oxygen transferred to water by consuming per useful work in the standard state and test conditions, expressed in kg/(kW·h) 3.6 quantity of aeration standard quantity of air filled into water per unit time by a bubble diffuser in the standard state and test conditions, expressed in m3/h (standard status) 3.7 resistance loss (RL) pressure difference before and after a certain aeration passes through a bubble diffuser in the atmospheric pressure of 101.325 kPa, expressed in Pa 4 Classification and models 4.1 Classification The structure types of membrane fine bubble diffusers are classified into disc type (integrated type or split type), tube type and plate type. See Figures 1 to 4 for the schematic diagrams of the structures of bubble diffusers.

Contents of CJ/T 264-2018

Contents Foreword i 1 Scope 2 Normative references 3 Terms and Definitions 4 Classification and models 6 Requirements 7 Test method 8 Inspection rules Annex A (Informative) Requirements for bottom aeration systems of membrane fine bubble diffusers