What chemicals are used for chemical reactions in the sewage treatment system of domestic production

1. In the sewage treatment system of domestic production, polyaluminum chloride is used for chemical reaction.

2. Polyaluminum chloride is a kind of water purification material, inorganic polymer coagulant, also referred to as polyaluminum, abbreviated as PAC, due to the bridging of hydroxide ions and the polymerization of multivalent anions, the production of inorganic polymer water treatment agents with large molecular weight and high charge.

3. Specific steps:

The first step is to try to find the best dosage before using the raw water according to the condition of the raw water. The configuration of the small-scale test solution is based on the weight ratio (w w), and it is generally better to mix 2 5%. If with 3% solution:

Weigh 3g of polyaluminum chloride PAC solid, put it in a 200ml graduated cylinder, add about 50ml of water, and then add water to dilute it to a 100ml scale after dissolving, and shake it well.

In the second step, when producing polyaluminum chloride PAC, it can be mixed and dissolved according to the ratio of polyaluminum chloride PAC: water = 1:9 to 1:15 by weight. The solution with alumina content less than 1% is easy to hydrolyze, which will reduce the use effect, and the concentration is too high and it is not easy to add uniformly.

Polyaluminum chloride can reduce COD to a certain extent (remind PAC that it is generally added in front of the biochemical system, and only added in the back as a last resort, and cannot be added in the biochemical tank, which will affect the sludge activity), if the COD BOD cannot be reduced in domestic sewage treatment, you can try to increase the aeration capacity, measure SVI (good sludge 50-120), and understand the sludge activity, the sludge activity is not good, it is difficult to deal with it, and the sludge activity is the most important thing.

Polyacrylamide is used for desliming. These two medicines are enough for general domestic sewage.

However, there will be many special circumstances, depending on the situation to choose different agents, may be acid and alkali and so on.

aluminium chloride; aluminium chloride; polyacrylamide, etc.

That's a lot, flocculants, coagulants, acids, alkalis, you have to be specific about what water quality.

The simplest can also be used, hydrated lime for chemical reactions

Aluminum chloride is commonly used in tap water.

The answer is lifting]: Lifting no Bi A

This question examines sewage treatment and reclaimed water reuse. Options B and C are biological treatments, and D is physical treatments.

1. Ozone oxidation treatment method: use ozone as an oxidant to purify and disinfect wastewater. This method uses air or oxygen containing low concentrations of ozone to treat wastewater. Ozone is a highly unstable, easily decomposable and strong oxidizing agent that needs to be manufactured on-site.

2. Electrolysis method: apply the basic principle of electrolysis to transform harmful substances in wastewater into harmless substances through electrolysis. Wastewater electrolysis treatment includes processes such as indirect oxidation and indirect reduction, electroflotation and electroflocculation, which remove pollutants from wastewater with different effects.

3. Chemical precipitation treatment method: soluble chemicals are added to the wastewater to make it react chemically with the inorganic pollutants in the ionic state to generate insoluble or insoluble compounds that are dissolved in the water and precipitate them, so as to purify the wastewater.

4. Coagulation treatment method: add coagulant to the wastewater, so that the colloidal particles in it can be coagulated and flocculated and separated, so as to purify the wastewater. The combined name of coagulation and flocculation of coagulation.

5. Oxidation treatment method: the use of strong oxidant oxidation to decompose pollutants in wastewater to purify wastewater. Strong oxidants can gradually degrade the organic matter in the wastewater into simple inorganic matter, and can also oxidize the pollutants dissolved in the water into substances that are insoluble in water and easy to separate from the water.