1、 Reference factors for selecting water treatment agents
1. Acidity of water treatment agents
No matter what water treatment agent, its acidity is the key. Acid agents are generally used for cleaning equipment, or product surface and pipeline, so its acidity index is very important. This kind of agent should pay attention to its stability and product quality, because it directly affects the cleaning effect and the quality of some small parts after cleaning.
2. Water content of water treatment agent
According to the basic pharmaceutical principle, the less water is, the better, but because of the production process, it is impossible to achieve no water content at all.
3. Non volatile impurities
The amount of impurities can directly affect the effect of the agent. In industrial circulating water, too much impurity of the agent will pollute the water quality, and for the cleaning agent, There will be invisible substances adsorbed on the surface of small products, which may directly affect the product quality. Because small products are directly soaked in the cleaning agents and then dried, impurities are also an important indicator.
4. Toxicity of water treatment agents
In fact, we don't need to say that the toxic drugs will directly pollute the environment and even affect the health of human body. Therefore, the non-toxic and low toxic drugs can be said to be an important indicator of the choice of the drugs.
2、 Reference factors of selecting the pharmaceutical technology of sewage treatment
The rate of sewage treatment compliance depends on the concentration and nature of sewage, discharge standard, process, sewage treatment agent, management and other factors. The first three factors are basically fixed, and the variable factors are mainly pharmacy and management. In sewage treatment, heavy catcher, phosphorus remover, COD remover, sub phosphorus remover, ammonia nitrogen remover, and complexor are often used in sewage treatment, and the types of agents are complex. How to choose a good drug is an important factor to improve the rate of reaching the standard. The pharmaceutical with the following factors is a good one.
(1) Low comprehensive unit consumption of 1 ton water
That is, the cost of different chemicals for treating 1 ton of sewage, such as the cost of this agent, other pharmaceutical expenses (such as acid regulation, alkali adjustment, PAM), sludge pressure cost (sludge volume, sludge pressure cost), labor cost, etc.
(2) High processing rate
It refers to the comparison of the highest removal efficiency of different chemicals, each kind of reagent has a limit of treatment rate. The higher the treatment rate, the higher the probability of the wastewater reaching the standard, and the lower the environmental risk.
2. No control pollutant brought in
If some agents with the purpose of phosphorus removal have their own total phosphorus content of thousands of thousands (assuming that the total phosphorus of the agent is 5000ppm and the dosage is 100ppm, the total phosphorus brought into the sewage reaches 0.5mg/l, which has reached the upper limit of level I a control);
The COD of the agent for the purpose of removing COD is over 10000 (assuming that the dosage of cod100000 ppm and the dosage of 3000ppm are assumed, the COD brought into the sewage by the agent is up to 30mg/l).
(1) Harmless to human body
It does not contain highly toxic thiols, thiourea, etc.
(2) Harmless to biochemical system
It does not contain copper, nickel, mercury, arsenic, chromium, cadmium, etc. which kill and inhibit microorganisms.
(3) Harmless to equipment
The corrosion of water pump, pipeline, instrument, concrete and container is small, otherwise the maintenance cost and reconstruction cost will be greatly increased.