NEWS
CHEMTICS
15
2021
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03
How to use bleaching powder to disinfect?
In view of the current epidemic situation of the virus, the application methods of bleaching powder concentrate in environmental disinfection and sterilization are as follows:
1. Environmental ground disinfection
Take 1-2g of this product per liter of water and dissolve it in water to prepare a solution. Spray or wipe the solution on the surface to be treated. After 30 minutes, the disinfection and sterilization effect can be achieved.
2. Drinking water disinfection
The proportion of 1.24g bleaching powder per ton of water is used for stirring, and the disinfectant is sent into the sterilizer to make the residual free chlorine reach at least 0.2ppm, and the residual chlorine in the whole distribution device shall not be higher than 0.6ppm. The chlorine content in the water is determined repeatedly with a chlorine meter. It is necessary to take bacterial samples frequently, and the number of times shall not be less than the requirements of the national Provisional Regulations on primary drinking water. Contact the local health department for details.
3. Wastewater and sewerage treatment
It can be directly added according to the concentration of 300-400ppm (i.e. 450-600g of the product per ton of water) or chemical water. If the number of Escherichia coli and other colonies in the chlorinated sewage has dropped to or below the maximum allowable value, the number of Escherichia coli or Escherichia coli in the residue should be calculated according to the common algorithm (MPN), so as to evaluate the disinfection process of sewage Degree.
Generally speaking, after 15 minutes of treatment, when the residual chlorine is 0.5ppm, the secondary sewage disinfection can achieve satisfactory treatment effect. Although residual chlorine is the key to measure the degree of disinfection, the relationship between residual chlorine and bacteria killing must also be considered, which is directly related to the requirements of water quality. It should be the final and basic standard, and the residual chlorine is only to determine that the index of Escherichia coli in sewage should reach the operation standard of a certain allowable range.
There are several key elements of sewage disinfection
It is very important to quickly mix the bleaching powder and waste water to make the chemical reaction between the active soluble substance and the granular composition in the medicine and waste water.
After the liquid medicine is quickly stirred, a certain flow rate of the solution passing through the system must be maintained.
And residual chlorine control: in order to achieve good disinfection effect, it is necessary to grasp the chlorine demand to maintain the required predetermined chlorine content. After keeping flowing for 15-30 minutes, the residual chlorine content in the secondary waste liquid is 0.2-1.0ppm, and the ideal residual chlorine content is 0.5ppm.
4. Disinfection of farm breeding industry
Before disinfection, remove all livestock, poultry and drinks from farmhouses, fences and transport vehicles, and remove the debris and feces from the ground, walls, feed sheds and livestock sheds. Then empty the storage tank and other materials and water supply equipment, thoroughly clean them with soapy water or detergent, and then rinse them with water.
The disinfectant with effective chlorine content of 1000ppm was prepared by mixing 1.5kg bleaching powder per ton of water. Use this disinfectant to soak all sides of the above equipment and facilities for 10 minutes, and soak all reins, forks, shovels and scrapers for handling feces and sundries in the disinfectant. The farmhouses, transport vehicles and other enclosed spaces are ventilated. After the chlorine gas has completely dissipated, the poultry and livestock can be driven back to their original places and locked in the livestock sheds and fences. All sterilized feed tanks, automatic feeders and water supply systems must be rinsed with drinking water before they are reused.
5. Disinfection of fruits and vegetables
Wash the fruits and vegetables in the pool, and mix them according to the proportion of 38g bleaching powder per ton of water to prepare a disinfectant containing 25ppm available chlorine. Drain the water from the pool and soak the vegetables or fruits in the pool with circulating disinfectant for two minutes. Spray with disinfectant before packing and rinse with drinking water before eating.
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