Lead: Limestone - gypsum method is currently the most widely used flue gas desulfurization boiler. The wastewater generated in the desulfurization process is mainly from waste water discharged from the absorption tower, waste water from the gypsum dehydration and cleaning system. The impurities contained in wastewater mainly include suspended solids, supersaturated sulfites, sulfates and heavy metals, many of which are the first type of pollutants that are subject to strict control in national environmental standards.
Wastewater treatment process: a wastewater neutralization (alkalization) a settlement of a flocculation of a clear a clear water (pH adjusted to 6 to 9 range)
Wastewater neutralization
The reaction tank is composed of three compartments. Each compartment is full of gravity and enters into the next compartment. When desulfurization wastewater enters the first compartment, a certain amount of milk of lime (5% -10% concentration) , By constant stirring, its pH value can rise from 5.5 to 9.0 above.
Heavy metal precipitation
The addition of Ca (OH) 2 not only raises the pH value of the wastewater, but also makes the heavy metal ions such as Fe3 +, Zn2 +, Cu2 +, Ni2 + and Cr3 + form hydroxide precipitates. In general, the trivalent heavy metal ions are more likely to precipitate than the divalent ions, and most of the heavy metal ions form insoluble hydroxides when the pH reaches 9.0-9.5. At the same time, Ca2 + in lime slurry can react with part of F in waste water to form insoluble CaF2; complex with As3 + to form insoluble substance such as Ca (As03) 2. At this point pb2 +, Hg2 + remain in ionic form in the waste water, so adding organic sulfide in the second compartment, make it react with Pb2 +, Hg2 + to form insoluble sulfide sediment {organic sulfides TMT-15 product concentration 15% according to the proportion of waste water dosing).
3 flocculation reaction
After the first two steps of chemical precipitation reaction, the wastewater also contains many fine and dispersed particles and colloids, so add a certain proportion of the third tank flocculant FeCIS04, so that they condensed into large particles and deposited in the Waste water reaction tank outlet plus cationic polymer polyelectrolyte as a coagulant to reduce the particle surface tension, strengthen the growth process of particles to further promote the precipitation of hydroxides and sulfides, so that small floes slowly Become larger, more easily deposited flocs, while the desulfurization wastewater suspended solids also settled down. In the flocculation system, add FeCISO4 and polymerization dielectric (coagulant) to increase the flocculation, improve the clarification effect. FeCISO4 40% of liquid products, according to the proportion of waste water dosage; coagulant added to a concentration of 0.1%.
Will air-conditioned rooms dry in summer? What about air-conditioned rooms
It will dry a little. During the refrigeration process, the air conditioner can remove some moisture from the air. Because the temperature of indoor air drops sharply after entering the air conditioner evaporator, its relative humidity will enter a supersaturated state. At this time, a large amount of dew will condense on the evaporator fins, which is "condensation" in refrigeration terminology. Therefore, the refrigeration process is accompanied by dehumidification. Because of the dehumidification function of the air conditioner, The indoor air humidity is much lower than the normal value, and the room becomes dry.
If the air in the room is too dry due to opening the air conditioner, this problem can be alleviated by increasing the air humidity. The humidifier is recommended as the first choice for room humidification. The humidifier can not only change the liquid water into atomization state and make the water vapor evenly distributed in the room, but also purify the air and reduce the risk of human disease. If you think the humidifier is troublesome, putting a basin of water in the room also has a certain role in alleviating dryness.
The doctor suggested that an Aroma Diffuser should be placed indoors, which can effectively and immediately solve the problem of indoor air drying, humidify the air and solve the problem of air drying. For the ultrasonic aroma diffuser, the fog is sprayed out through vibration. You can contact us to learn more about aroma diffuser
Drink more water. If you have dry mouth and dry tongue after staying in the air-conditioned room for a long time, it is first recommended to drink more water, which is the most direct and rapid way to alleviate the discomfort of dry mouth. Instead of waiting until you are thirsty, you should replenish water at any time, because the air-conditioned room is easy to take away the water from the human body. In addition to the performance of dry mouth and dry tongue, there may also be discomfort such as dry skin, dry lips and eyes, molting, etc, Therefore, replenishing water at any time is a very important measure
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