What are the sources of pollution in the purification room and dust-free room?
Release time:2019-10-02 source:
What are the sources of pollution in the purification room and dust-free room? Ed Purification Title for you to sort out, mainly from the amount of bacteria and dust to consider, the following is the specific content:
1. Bacterial Quantity in Purification Room and Dustless Room
Pollution caused by workers in purification rooms and dust-free rooms:
1) Skin: Human skin is usually completely removed every four days, and about 1,000 pieces of skin are shed per minute (average size is 30*60*3 micron).
2) Hair: Human hair (about 50-100 microns in diameter) has been falling off.
3) saliva: sodium, enzyme, salt, potassium, chloride and food particles.
4) Daily clothing: particles, fibers, silica, cellulose, chemicals and bacteria.
5) Human beings will produce 10,000 particles more than 0.3 microns per minute when they are still and standing.
6) Human beings will produce 1000000 particles larger than 0.3 microns per minute when they move their heads and trunks.
7) When humans walk at a speed of 0.9m/s, 5000000 particles larger than 0.3m will be produced per minute.
Analyzing the test data of foreign countries, it can be concluded that:
(1) When workers wear sterile clothes in clean rooms:
The amount of bacteria produced at rest is usually 10-300 per minute.
The amount of germs produced during general physical activity is 150-1000 per minute.
The germ count is 900-2500/min when walking fast.
(2) A cough is usually 70-700 per minute.
A sneeze is usually 4000 to 62000 per minute.
(3) 3300-62000 bacteria per minute when wearing ordinary clothes.
(4) Mask-free bacteria: Mask-free bacteria 1:7-1:14
(5) Amount of bacteria: 1:500-1:1000 of dust, according to domestic cases:
(6) 878 cases per minute of bacteria in operation.
2. Dust emission from purification room and dust-free room
The amount of dust in the clean room can be removed by local exhaust from equipment and not flowed into the room. Compared with the amount of human dust, the amount of dust generated by products and materials during transportation is generally very small and negligible. Because the application of metal half-wall (color steel sandwich panel) comes from the surface of buildings very little, generally less than 10%, and the dust mainly comes from people, accounting for about 90%. As for the amount of human dust, due to the improvement of clothing materials and styles, the amount of dust is also decreasing.
Material: Cotton dust Zui is large, followed by cotton, dacron, destatic pure polyester, nylon.
B. Style: The large hanging type has a large amount of dust Zui, followed by the upper and lower sub-Pack type, and the full cover type has less zui.
C. Activity: The amount of dust generated during movement generally reaches 3-7 times of the rest time.
D. Cleaning: The amount of dust washed with solvent is reduced to one fifth of that washed with ordinary water.
The amount of dust on the surface of the maintenance structure of the purification room and the dust-free room is based on the ground. The amount of dust on the surface of the corresponding 8 square meters of ground is equal to that of a stationary person.
The professional engineers of ED purification engineering are designed to adapt to the production process and reasonable cost of the project. The design technology index conforms to the national standard clean room standard, the experienced purification engineering team is quick and efficient, and the after-sale service is perfect. For more knowledge of medical purification industry, please pay attention to the public address: Aide-188 (Ed purify oxygen supply).