(1) Inlet water quality
Chromaticity ≤ 15 degree
Water temperature ≥5℃
Total coliforms ≤ 1000/L
Total number of bacteria ≤2000/ml
(2) Air environment
The maximum relative humidity in the air is ≤90% (equivalent to air at 20℃ 5℃).
(3) Power supply
2) Basic technical requirements
(1) The design of sterilizer shall meet the requirements of GB 8988 Safety Requirements for Household and Similar Electronic and Related Equipment.
(2) The sterilizer shall be manufactured according to the drawings and technical documents approved by the technical management procedure.
(3) The parts of the same type sterilizer shall ensure their interchangeability.
(4) The surface of the sterilizer irradiated by ultraviolet rays should be polished.
(5) The working pressure of the pressurized gas cylinder shall be not less than 0.60MPa, and the test pressure shall be not less than 0.90MPa.
(6) The guide plate should be arranged in the cylinder or box.
(7) The installation requirements of straight-tube ultraviolet low-pressure mercury lamps and tubes shall meet the requirements of YY/T0 160 "Timely Straight-tube Ultraviolet Low-pressure Mercury Disinfection Lamps".
(8) When the environmental requirements are high, low ozone lamps should be given priority to reduce ozone pollution to the environment.
(9) The arrangement of the lamp tube should make the ultraviolet intensity distribution on the surface irradiated by ultraviolet light uniform.
(10) The sterilizer should have light indication, cumulative illumination time indication or relative indication of ultraviolet intensity.
(1 1) The lamp tube should be separated from water by a timely glass sleeve, and the ultraviolet transmittance of the 253.7mm timely sleeve should be greater than 85%.
(12) The low-voltage electrical appliances selected for the sterilizer shall meet the technical requirements of the corresponding products.
(13) The sterilizer shall be equipped with water inlet and outlet pipes, drainage pipes and sampling pipes. When it is inconvenient to install the drain pipe in the sterilizer, it can also be installed (14). The specifications of the sterilizer and the diameter of the inlet and outlet pipes should be selected according to the table.
(15) According to the inspection requirements of this standard, the measured ultraviolet radiation dose of sterilizer products equipped with new lamps shall not be lower than12000 &; Microscopic; Width/cm. (It should be filled with water), and the ultraviolet radiation dose measured by the normal working sterilizer shall not be less than 9000 &; Microscopic; Width/cm.
(16) According to the use conditions of this standard, the bacteriological indexes of the effluent should meet the requirements of GB5749 Hygienic Standard for Drinking Water when working under rated disinfection water.
(17) The material of sterilizer shall meet the requirements of GB/T 172 19 Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials. Sterilizer should use 304L and 3 16L stainless steel.
(18) The head loss of the sterilizer working under the rated disinfection water quantity should be less than 0.005MPa.
3) Appearance requirements
(1) The surface of the equipment shall be painted evenly with the same color, and there shall be no flow marks, bubbles, paint leakage and peeling on the surface.
(2) The appearance of the equipment is neat and beautiful, without obvious hammer marks and unevenness, and the instruments, switches, indicator lights and signs on the disk surface should be installed firmly and correctly.
(3) The welding of equipment shell and skeleton shall be firm, without obvious deformation or burn-through defects.
4) Key points of construction and installation
(1) It is not easy to install the ultraviolet generator on the outlet pipe near the water pump to prevent the water hammer from stopping the pump and damaging the timely glass tube and lamp tube.
(2) The ultraviolet generator shall be installed in strict accordance with the water inlet and outlet direction.
(3) The ultraviolet generator should have a foundation higher than the building ground, and the foundation should not be less than 100mm from the ground.
(4) The ultraviolet generator and its connecting pipes and valves shall be firmly fixed, and the ultraviolet generator shall not bear the weight of pipes and accessories.
(5) The installation of the ultraviolet generator shall be convenient for disassembly, overhaul and maintenance, and materials that affect water quality and hygiene shall not be used for all pipe joints.
5) Implementing standards
(1) product standard
Ultraviolet sterilizer QB/T
Ultraviolet disinfection equipment for urban water supply and drainage GB/T
Ultraviolet sterilizer for drinking water
(2) Engineering standards
Code for design of building water supply and drainage GB
Code for design of outdoor drainage GB
Discharge standard of pollutants for urban sewage treatment plants GB
Urban Sewage Reuse and Urban Miscellaneous Water Quality GB/T 18920-2002
Code for Design of Wastewater Reuse Engineering (with provisions) GB 50335-2002
Code for Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering GB 50242-2002
(3) Relevant standard drawings
Selection and installation of disinfection equipment for secondary water supply 02SS 104
According to different biological functions, ultraviolet rays can be divided into UV-A(320-400nm), UV-B(275-320nm), UV-C(200-275nm) and vacuum ultraviolet rays. In fact, the UV-C part of ultraviolet rays is used for water treatment, and the vicinity of 260nm in this band has been proved to be the ultraviolet rays with the highest sterilization efficiency.
Table of technical parameters of common ultraviolet sterilizers: model throughput T/H of small-flow ultraviolet sterilizers, Imported pipe diameter mm power W overall dimension working pressure ZXB-15150.4 ZXB-401.5-2 25 40 75 * 900 0.6 ZXB-55 3-4 32 55 75 *1 200 0.6 zx b-75 5 5-6 32 75 75 * 900 0.6 zx b- 100 100 0.6 ZXB-360 32-35 80 360 159 * 1300 0.6 ZXB-400 35-38 1 00 400 159 * 1 100 0 0.6 ZXB-400 36-40 100 1300 0.8 ZXB- 1200 120- 130 150 / kloc-0/200 273 * 1300 0 0.8 ZXB- 1320 140- 150 150/200