Although the sludge precipitated by urban sewage contains a certain amount of organic matter and nitrogen, phosphorus and potassium components, this kind of raw materials does not cost money and the processing cost is very low, but the heavy metals and E. coli seriously exceed the standard, which is easy to cause dead roots and dead trees, and the fruit is eaten by people. It is easy to cause malignant cancer.
Although the sludge precipitated by industrial wastewater contains a large number of elements and organic matter, heavy metals are also seriously exceeding the standard, which can cause rotten roots and dead trees, and seriously pollute the soil.
The waste of paper mills, this fertilizer, is mainly composed of lignin, which is an organic matter that is extremely difficult to absorb. What's more, many chemical raw materials are added in the papermaking process, and most of these raw materials are stored in the waste. The damage to the soil is great, and the impact on the roots of the trees is great.
The investigation of weathered coal found that weathered coal is only apparent organic matter and cannot be a carbon source for soil microorganisms. Although weathered coal contains humic acid and fulvic acid, these nutrients cannot play their role without further processing.
The waste from the MSG factory is strongly acidic. Although it is food waste, it is not necessarily a good raw material for organic fertilizer.
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It can be used for surgical operations, patient treatment; epidemic prevention and inspection in public places; disinfection in virus-contaminated areas; and can also be widely used in military, medical, chemical, environmental protection, transportation, epidemic prevention and other field
By setting a protective collar, the neck of the operator can be kept warm and protected. The provision of a hand guard is helpful for the surgical staff to temporarily place their hands in the hand guard while waiting during the operation, which plays a protective role and is more in line with the principles of aseptic operation and occupational protection.
By setting the shrinking cuffs, it is beneficial to make the cuffs fit the wrists, prevent the cuffs from loosening, and prevent the gloves from slipping off during the operation and the operator's hands are exposed to the gloves.
The design of the new humanized protective surgical gown has been improved in the key areas of the gown. The forearm and chest area are double-thickened, and there are handguards in front of the chest and abdomen. By arranging reinforcing sheets (double-layer structure) in key areas, it is beneficial to improve the water-permeability of surgical gowns and improve safety.
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