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GB/T 35937-2018 English PDF (GBT35937-2018)

GB/T 35937-2018 English PDF (GBT35937-2018)

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GB/T 35937-2018: Household and similar drinking water purifier performance test method

This standard specifies the terms and definitions and test methods for drinking water treatment equipment for household and similar purposes. This standard applies to the performance test of drinking water treatment equipment for household and similar purposes.
GB/T 35937-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 97.180
Y 69
Household and similar drinking water
purifier performance test method
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Test methods ... 5
4.1 Test conditions and equipment ... 5
4.2 Visual inspection ... 7
4.3 Structural performance test ... 8
4.4 Hygiene safety test ... 11
4.5 Performance test ... 12
4.6 Electrical safety ... 27
Appendix A (Informative) Preparation of contaminant liquid ... 28
Household and similar drinking water
purifier performance test method
1 Scope
This standard specifies the terms and definitions and test methods for drinking water treatment equipment for household and similar purposes (referred to as ?€?water treatment equipment?€?).
This standard applies to the performance test of drinking water treatment equipment for household and similar purposes.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB 4706.1 Household and similar electrical appliances - Part 1. General requirements
GB 5749 Standards for drinking water quality
GB/T 5750 (all parts) Standard examination methods for drinking water
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 17218 Hygienic safety evaluation for chemicals used in drinking water treatment
GB/T 17219 Standard for safety evaluation of equipment and protective
mater
GB/T 22090 Cold and hot water dispenser
3 Terms and definitions
The following terms and definitions apply to this document.
follows.
a) The water treatment equipment unit shall be installed on a shelf or platform off the ground. Set the equipment unit to be tested step by step in
accordance with 4.3.2 a) and b) and fill it with water.
b) Install a suitable measuring instrument (such as an extensometer or
micrometer) vertically on the container chassis and top cover, securely install the control valve or other components on the container top cover. c) Install a suitable measuring instrument (such as an extensometer or
diameter ruler) 15 cm from the chassis on the central axis of the container. In addition, it shall install the additional measuring instruments on the side wall of the container, with a vertical spacing of not more than 30 cm. The measuring instrument shall be installed within 30 cm of the top cover of the container. If the height of the container does not exceed 61 cm, the measuring instrument shall be installed in the center of the container. When using the extensometer, it shall wrap the extension line (cord)
around the container at the vertical axis, 15 cm above the chassis. One end of the extension line shall be fixed to a solid terminal of the same leveling height. The other end is fixed to another solid terminal at the same level by a spring to tension the extension line. Each end of the extension line shall be fastened to the cushion block and close to the container wall, so that the spacing between the cushion blocks is 15 cm ~ 20 cm. For
larger containers, the spacing of the cushion blocks is allowed to be
increased accordingly to avoid contact of the cushion block with the
container. A cushion block shall be attached to each winding as described above.
d) Record the initial value of the measuring instrument before applying pressure to the test equipment. When using the extensometer, the module spacing on each line shall be measured using a spiral micrometer.
e) Pressurize the test equipment in accordance with steps c) and d) of 4.3.2. f) The final data is read from the extensometer or other measuring instrument when the test equipment is not under pressure.
g) The difference between the readings of the measuring instrument is the size of the permanent deformation of the top cover or bottom of the
container. The difference in the measured circumference of the container is the increment of the circumference of the container.
4.3.4 Bursting pressure test (non-metallic pressure vessel)
Metal pressure vessels are not subjected to burst pressure test. The burst pressure test of non-metallic pressure vessels shall be carried out as follows. - Influent water pressure. (0.24 ?? 0.02) MPa.
For the discontinuous water treatment device, the lower limit value of the nominal value of the manufacturer is used.
4.5.2.2 Test method
Connect the water treatment device to the water supply system in accordance with the instructions for use (except for the water storage container). After flushing the water treatment device in accordance with the product instructions, when the treated water volume reaches the nominal rated total purified water volume, collect the purified water at the water outlet of the water treatment device. The collection time is (300 ?? 2) s, measure the water amount, make one collection at the time interval of 5 min, 3 collections in total, take the arithmetic mean of 3 test values as the test results.
4.5.3 Rated total purified water volume test
The rated total purified water volume test is performed as follows.
a) Rinse the water treatment device sample in accordance with the product instructions;
b) Lead in the municipal tap water in accordance with the water production flow indicated in the product description;
c) In accordance with the total rated water production, the whole process is divided into four sections;
d) When reaching to 0% and 100% of the nominal rated total purified water volume of the water treatment device, respectively perform purified water quality test in accordance with the method of clause 4.5.1; at the same time, when reaching to 0%, 25%, 50%, 75%, and 100% of the nominal
rated total purified water volume of the water treatment device, perform the spike test, the contaminant item and concentration of the purified water treatment device are as shown in Table 3 and Table 4, the contaminant
item and concentration of the general water treatment device are as
shown in Table 5;
e) The concentration of the contaminant liquid concentration of the general water treatment device is approximately equivalent to three times the
allowable value of GB 5749. At this time, the removal rate of each section is required to be greater than 60%; when it is equivalent to 5 times the allowable value, the removal rate of each section is required to be greater than 80%. For those with activated carbon components, the removal rate
of oxygen consumption shall be greater than or equal to 25%; the total
coliform index shall be (n x 102 ~ 2 x 103)/100mL (1 ??? n < 10, the report Appendix A
(Informative)
Preparation of contaminant liquid
A.1 Residual chlorine purification test
A.1.1 Preparation of residual chlorine contaminant liquid
The preparation of the residual chlorine contaminant liquid is carried out as follows.
a) Residual chlorine standard stock solution [??(Cl2) = 2.0 mg/mL]. ADD 2.0 mL of 10% (effective chlorine) sodium hypochlorite (NaClO) solution to a 100 mL volumetric flask, USE the purified water to make the volume reach to the mark.
b) Residual chlorine contaminant liquid [??(Cl2) = 2.0 mg/L]. PIPETTE 1.00 mL of residual chlorine standard stock solution, TRANSFER it into a
volumetric flask, USE purified water to make the volume reach to 1000
mL, PREPARE it before use.
A.1.2 pH adjustment
The pH of the contaminant liquid is adjusted by dropwise addition of a 6 mol/L sodium hydroxide (NaOH) solution or a 6 mol/L hydrochloric acid (HCl) solution. A.1.3 Adjustment of the total dissolved solids
The TDS value of the contaminant liquid is adjusted by adding sodium chloride (NaCl) or pure water.
A.1.4 Adjustment of other indicators
Other indicators are adjusted as required by Table 6.
Note. In order to ensure the specific content of free residual chlorine, the test water may need to be pre-chlorinated and dechlorinated.
A.2 Hydrogen sulfide and phenol purification test
A.2.1 Preparation of contaminant liquid
A.2.1.1 Hydrogen sulfide
The preparation of the hydrogen sulfide contaminant liquid is carried out as g/mL), in a volumetric flask, USE pure water to make its volume reach to 100 mL.
b) Iron contaminant liquid [??(Fe) = 4.0 mg/L]. PIPETTE 4.00 mL of iron
standard stock solution, TRANSFER it to a volumetric flask, USE pure
water to make its volume reach to 1000 mL, PREPARE it before use.
A.3.1.2 Manganese
The preparation of the manganese contaminant liquid is carried out as follows. a) Manganese standard stock solution [??(Mn) = 1.0 mg/mL]. WEIGH 0.2291
g of anhydrous manganese chloride (MnCl2, first grade), USE pure water
to dilute it to 100 mL.
b) Manganese contaminant liquid [??(Mn) = 1.5 mg/L]. PIPETTE 1.50 mL of
manganese standard stock solution, USE pure water to make its volume
reach to 1000 mL.
A.3.2 Adjustment of the total dissolved solids
The TDS value of the contaminant liquid is adjusted by adding sodium chloride (NaCl) or pure water.
A.3.3 Adjustment of other indicators
Other indicators are adjusted as required by Table 10.
A.4 Zinc ion purification test
A.4.1 Preparation of contaminant liquid
The preparation of the zinc contaminant liquid is carried out as follows. a) Zinc standard stock solution [??(Zn) = 1.0 mg/mL]. WEIGH 0.2085 g of zinc chloride, USE pure water to dilute it to 1000 mL.
b) Zinc contaminant liquid [??(Zn) = 10 mg/L]. WEIGH 10.00 mL of zinc
standard stock solution, USE pure water to dilute it to 1000 mL.
A.4.2 pH adjustment
The pH of the contaminant liquid is adjusted by dropwise addition of a 6 mol/L sodium hydroxide (NaOH) solution or a 6 mol/L hydrochloric acid (HCl) solution. A.4.3 Adjustment of the total dissolved solids
The TDS value of the contaminant liquid is adjusted by adding sodium chloride (NaCl) or pure water.
WEIGH 0.1005 g of chloroform (>99.5%) in a 100 mL volumetric flask,
USE methanol to dissolve and dilute it to the mark.
b) Chloroform contaminant liquid [??(CHCl3) = 0.45 mg/L]. WEIGH 0.45 mL of chloroform standard stock solution, USE pure water to dilute it to 1000 mL. A.5.2 pH adjustment
The pH of the contaminant liquid is adjusted by dropwise addition of a 6 mol/L sodium hydroxide (NaOH) solution or a 6 mol/L hydrochloric acid (HCl) solution. A.5.3 Adjustment of the total dissolved solids
The TDS value of the contaminant liquid is adjusted by adding sodium chloride (NaCl) or pure water.
A.5.4 Adjustment of other indicators
Other indicators are adjusted as required by Table 14.
A.6 Inorganic substance purification test
A.6.1 Preparation of the contaminant liquid
A.6.1.1 Fluoride
The preparation of the fluoride contaminant liquid is carried out as follows. a) Fluoride standard stock solution [??(F-) = 1000 mg/L]. WEIGH 0.2210 g of sodium fluoride (NaF) which has been dried at 105 ??C for 2 h, DISSOLVE
it in pure water, DILUTE it to 100 mL, STORE it in polyethylene bottle. b) Fluoride contaminant liquid [??(F-) = 8.0 mg/L]. TAKE 8.00 mL of the above fluoride standard stock solution, USE pure water to dilute it to 1000 mL. A.6.1.2 Nitrate nitrogen
The preparation of the nitrate nitrogen contaminant liquid is carried out as follows.
a) Nitrate nitrogen standard stock solution [??(NO3-N) = 1000 mg/L]. WEIGH 6.0714 g of sodium nitrate (NaNO3) which has been dried at 105 ??C ~
110 ??C for 1 h, DISSOLVE it in pure water, MAKE its volume reach to 1000 mL.
b) Nitrate nitrogen contaminant liquid [??(NO3-N) = 30.0 mg/L]. TAKE 30.00 mL of the above standard stock solution, DILUTE it to 1000 mL.
A.6.2 pH adjustment
A.7.1.7 Lead
The preparation of the lead contaminant liquid is carried out as follows. a) Lead standard stock solution [??(Pb) = 0.5 mg/mL]. WEIGH 0.7990 g of
lead nitrate [Pb(NO3)2], DISSOLVE it in about 100 mL pure water, ADD 1
mL of nitric acid (??20 = 1.42 g/mL), USE pure water to make its volume
reach to 1000 mL.
b) Lead contaminant liquid [??(Pb) = 0.15 mg/L]. TAKE 0.30 mL of lead
standard intermediate solution in a 1000 mL volumetric flask, USE pure
water to dilute it to the mark, SHAKE it uniformly.
A.7.1.8 Trivalent arsenic
The preparation of the trivalent arsenic contaminant liquid is carried out as follows.
a) Trivalent arsenic standard stock solution [??(As) = 0.1 mg/mL]. WEIGH 0.1320 g of arsenic trioxide (As2O3) which has been dried at 105 ??C for 2 h in a 50 mL beaker, ADD 10 mL of sodium hydroxide (?? = 40 g/L) to
dissolve it, ADD 5 mL of hydrochloric acid (??20 = 1.19 g/mL), TRANSFER
it into a 1000 mL volumetric flask, USE pure water to make its volume
reach to the mark, SHAKE it uniformly.
b) Trivalent arsenic contaminant liquid [??(As) = 0.30 mg/L]. PIPETTE 3.00 mL of trivalent arsenic standard intermediate solution in a 1000 mL
volumetric flask, USE pure water to dilute it to the mark.
A.7.2 pH adjustment
The pH of the contaminant liquid is adjusted by dropwise addition of a 6 mol/L sodium hydroxide (NaOH) solution or a 6 mol/L hydrochloric acid (HCl) solution. A.7.3 Adjustment of other indicators
Other indicators are adjusted as required by Table 18 or Table 20.
A.8 Turbidity reduction test
A.8.1 Preparation of the contaminant liquid
The preparation of the turbidity contaminant liquid is carried out as follows. a) Formazin standard suspension. respectively PIPETTE 5.00 mL of barium sulfate solution and 5.00 mL of cyclo hexamethylenetetramine solution in a 100 mL volumetric flask, MIX it uniformly, PLACE it at (25 ?? 3) ??C for 24 h, ADD pure water to the mark, MIX it uniformly. This standard suspension

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