Minimum allowable value of water efficiency and water efficiency grades for reverse osmosis drinking water purifiers

Transcription

1 ICS Q 31 NATIONAL STANDARD OF THE PEOPLE S REPUBLIC OF CHINA GB/T x x x x 201 x Minimum allowable value of water efficiency and water efficiency grades for reverse osmosis drinking water purifiers Published on xx-xx-20xx Entered into force on xx-xx-20xx Published by the General Administration of Quality Supervision, Inspection andquarantine of the People's Republic of China Standardisation Administration of the People s Republic of China

2 PREAMBLE All of the technical content in this standard is mandatory. This standard was drafted based on the rules outlined in standard GB/T This standard was proposed by the National Development and Reform Commission and the National Water Conservation Office. This standard is attributed to the National Water Conservation Technical Committee of the Standardisation Administration of China (SAC/TC 442). Organisations involved in drafting this standard: China National Institute of Standardisation, Jiangsu Cikon Environmental Appliances Co Ltd, Shenzhen Angel Drinking Water Industrial Group Co Ltd, Qingdao Economic and Technological Development Zone Haier Water Heaters Co Ltd, Shanghai Ozner Water Purification Technology Development Co Ltd, Foshan Midea Chungho Water Purification Equipment Co Ltd, A. O. Smith Water Heaters (China), Qingdao Haier Strauss Water, Shenzhen Calux Water Purification Technology Co Ltd, Chengdu Huajin Times Technology Co Ltd, Sunrain Group Co Ltd, Zhuhai Gree Electrical Appliances Co Ltd, Zhejiang Qinyuan Water Treatment Technology Co Ltd, Kochin Environmental Technology (Ningbo) Co Ltd, Foshan Yajieyuan Technology Co Ltd, Water Purification Equipment Professional Committee of the Chinese Association of Quality Inspection, and Beijing Xinhua Water Saving Products Certification Co Ltd. Key people involved in drafting this standard: Bai Xue, Zhu Chunyan, Wang Yujie, Huang Zhangyan, Sun Qian, Zhang Heng, Liu Zhiqiang, Cheng Zhaoshan, Chen Tian, Xu Linong, Gao Liang, Qu Guinan, Liu Xiaoping, Yang Qiaohua, Chen Ronghua, Chen Jin, Ye Xiuyou, Wang Chuan, Luo Siquan, Li Jie, Cai Kuan, Deng Ruide, Yin Chunxia, Deng Zhe, Wang Tongshuai, Liu Jing, and Yang Kun.

3 Minimum allowable value of water efficiency and water efficiency grades for reverse osmosis drinking-water purifiers 1. Scope This standard stipulates the minimum allowable value of water efficiency, the watersaving evaluation value, technical requirements and test methods for reverse osmosis water purifiers ( water purifiers ). This standard applies to municipal tap water or raw water taken from any other centralised water supply. A reverse osmosis membrane is the principal purification unit used to provide continuous drinking water for domestic and similar uses. 2. Normative reference documents The following documents are indispensable when applying this document. For all dated reference documents, only the dated versions apply to this document. For undated reference documents, the latest version of the document (including all the amendments) applies to this document. GB/T 5750 (all sections) Standard examination methods for drinking water GB/T Reverse osmosis water treatment equipment GB/T Drinking-water treatment equipment for domestic and similar uses QB/T 4144 Reverse osmosis water purifiers for domestic and similar uses 3. Terminology and definitions Terminology and definitions set out in GB/T 19249, GB/T and QB/T 4144 are applicable to this document: 3.1 Purified water production rate The total amount of purified water produced as a percentage of the total amount of water fed into the purifier s reverse osmosis system under the test conditions stipulated by the standard, provided that the service life of the reverse osmosis membrane has not been compromised. 3.2 Purified water flow rate The amount of water produced by the purifier per unit time under the test conditions stipulated by the standard. 3.3 Total water production capacity The cumulative amount of water produced by the water purifier under the test conditions stipulated by the standard, when any purification unit is used to regenerate or replace, and when the quality of the purified water produced is compliant and the purified water flow rate is greater than the nominal purified water flow rate.

4 3.4 Minimum allowable value of water efficiency for water purifiers The lowest purified water production rate permitted for the water purifier under the test conditions stipulated by the standard. 3.5 Water-saving evaluation value for water purifiers The lowest purified water production rate permitted for water-saving water purifiers under the test conditions stipulated by the standard. 4. Technical requirements 4.1 Total water production capacity The water purifier s total water production capacity must be greater than the nominal value. 4.2 Purified water flow rate The water purifier s purified water flow rate must be greater than the nominal value when it reaches nominal total water production capacity. 4.3 Concentrated water Water purifiers used to produce water for sale must be equipped with a concentrated water recycling device. 4.4 Water purifier s water efficiency grade The water purifier has five different water efficiency grades, with 5 representing the lowest water efficiency The purified water production rate of each grade must meet the requirements shown in Table 1. Table 1 Water efficiency grade index for water purifiers Purifier water efficiency grade Purified water production rate (%) 4.5 Minimum allowable water efficiency value This is the purified water production rate required for water efficiency grade Water-saving evaluation value This is the purified water production rate required for water efficiency grade 2.

5 5. Test method 5.1 Test water When determining the water purifier s total water production capacity, purified water flow rate and purified water production rate, the test water used should be prepared from pure water (conductivity <10 μs/cm, total dissolved solids <5 mg/l) The water used for testing must meet the following quality requirements: a) Total hardness should be (250 ± 20) mg/l; b) Alkalinity should be (160 ± 20) mg/l; c) Total dissolved solids should be (500 ± 50) mg/l; d) ph value should be between 7 and See Appendix A for the test water preparation method. 5.2 Test conditions The following test conditions must be met when determining the water purifier s total water production capacity, purified water flow rate and purified water production rate: a) Ambient temperature should be (25 ± 5) C; b) Relative humidity should be %; c) Supply voltage should be the rated voltage, and the frequency (50 ± 1) Hz; d) Water temperature should be (25 ± 1) C; e) Water intake pressure should be (0.24 ± 0.02) MPa. 5.3 Testing and calculations The purified water flow rate is determined using the method described in QB/T The entire process is divided into four steps based on the manufacturer s nominal total water production capacity. A total of five water samples are taken for testing: when the test water is first inserted (sample 1), at the end of step 1 (sample 2), at the end of step 2 (sample 3), at the end of step 3 (sample 4) and at the end of step 4 (sample 5). The following control indicators are used to test the equipment s removal efficacy, and the specific test method used is the one described in GB/T 5750: a) Total hardness (calculated based on CaCO 3 ) removal rate 90 %; b) Total dissolved solids removal rate 85 % Once the water purifier has been installed and set up in accordance with the product manual, insert the test water at a constant intake pressure and switch the product to continuous operation based on its set operating mode until the amount of purified water produced reaches the nominal total water production capacity. Record the total amount of water entered and total concentrated water, then use formula (1) or (2) to calculate the purified water production rate. If the flow rate and removal rate requirements cannot be met before the nominal total water production capacity is reached, the machine is judged to be incapable of attaining its nominal total water production capacity and the test is stopped.

6 .. (1).. (2) Where: Y = purified water production rate (%); Q p = total water production capacity (L); Q r = total concentrated water production capacity (L); Q f = total water intake (L). Note 1: If the water purifier has a flush function, the amount of water flushed must also be added to the total water intake value. Note 2: If the water purifier has a continuous operation protection function, disable this feature. Note 3: If the water purifier is equipped with a pressure tank, remove the tank prior to testing.

7 Appendix A (for information) Test water preparation method Using pure water (conductivity <10 µs/cm, TDS <5 mg/l), follow the steps below to formulate a standard preparation (this example will formulate 100 L of test water): a) Weigh out g anhydrous CaCl 2, g anhydrous NaHCO 3 and 5.00 g NaCl, and dissolve them all in small, separate amounts of pure water; b) Separately add each of these dissolved substances to 100 L pure water, and stir immediately after each individual substance has been added. Once all have been added, continue to stir until thoroughly mixed; c) Measure out 5-10 ml 5.2 % NaClO stock solution and dilute with pure water to obtain 1 L. Then extract 100 ml of this diluted solution and add to the 100 L of water from step b, and stir until thoroughly mixed; d) Use NaOH or HCl to adjust the ph value until it is between 7.0 and 7.5; e) The prepared test water should be stored away from the light in a sealed container, and used as soon as possible. Test water that has been left overnight must not be used. Note: All chemical reagents used must be of analytical or equivalent purity.