Ask for help with NAOH for wastewater treatment!

The common liquid alkali concentration is 30%, and the flake alkali concentration is 98%-99%, which is basically configured according to the ratio of 1:3.

That is, the ton of flake alkali is equipped with a barrel, pay attention to safety when configured, it will emit a lot of heat, and at the same time, it should be added slowly, and it is easy to harden at one time.

The conventional industrial liquid soda is 40%, you see what concentration you used before. In the case of flake alkali configuration, the first two are not right. Liquid alkali concentration = flake alkali mass (flake alkali mass + water quality).

It is calculated that with a 40% solution, a ton of water needs to add about 667kg of flake alkali.

The few upstairs are too forgiving, let's put it simply.

Liquid alkali for water treatment.

Most of them have a mass ratio of 32%, and the density, that is, the mass of 1 liter of liquid alkali solution is kilograms, and the mass containing 100% NaOH in it is kilograms.

So you just add to your one-ton preparation bucket.

430 kg of pure flake soda.

That's it. But if you buy flake alkali purity is 95% or other, you need 430 kg divided by flake alkali purity.

Generally, the concentration of liquid is about 40%, and after using solids, 1 ton of barrel dissolves tons.

If it is room temperature, pH = 14, c(oh-) = 1mol l, n(naoh) = solution volume xc (oh-).

For the treatment of acidic wastewater, neither NaOH solution nor Ca(OH)2 solution is used, but Ca(OH)2 suspension is used.

The reason should be comprehensive! 1: The cost of using NaOH is higher than that of Ca(OH)2, 2: more importantly, Ca(OH)2 is less alkaline than NaOH, 3: and the solubility of Ca(OH)2 is much smaller than that of NaOH, and the pH value in the water is easy to control.

If you use NaOH solution or Ca(OH)2 solution, from the solution point of view, you should choose NaOH solution!

Ca(OH)2 solubility is very small, how can you use Ca(OH)2 solution to neutralize acidity!

With Ca(OH)2

1: NaOH is a strong acid, and the amount is not well controlled, which can easily make the water alkaline, while Ca(OH)2 will not;

2: A molecule of Ca(OH)2 is twice the capacity of a molecule of NaOH to treat acidic sewage, and people have 2 hydroxides;

3: Ca(OH)2** is relatively cheaper.

Calcium hydroxide is generally used.

The rationale: they all serve the same purpose, but sodium hydroxide has a high cost and calcium hydroxide has a low cost. Therefore, choose the low-cost one.

Solution: Let the mass of hydrochloric acid participating in the reaction be repentance x

naoh+hcl=nacl+h2o

20g* x

Solution x=Huaiyun*100%=

Answer: slightly (Hebei lead front beam practice).

1) How much solid NaOH needs to be added to 1 ton of water: depending on how much pH value needs to be raised in the raw sewage, if the span is larger, the concentration point can be 20% to 30%; If the pH only needs to be slightly raised, it is better to dilute it a little, 10% is OK, which can avoid waste.

2) It needs to be stirred until it is completely dissolved, and it should be all right within the bell.

3) The step is to put some water first, then add solid imitation rolling NaOH, and then turn on the mixer after adding, or add solid NaOH while opening the mixer.

4) Solid NaOH is a strong alkali, which should be sealed and stored, and it is easy to absorb water and react with CO2 when exposed to air. NAOH has strong corrosiveness, which has an impact on the human body, eyes, respiratory mucosa, surrounding metal equipment, concrete floors, pools, etc., and it is necessary to pay attention to the ventilation of the preparation place, and there should be an exhaust system to avoid dust drifting around, and personnel need to wear gas masks, glasses, rubber hand Zheng Da disturbance covers, plastic aprons, glue shoes, etc.

Suppose there is a 1L NaOH solution, the NaOH mass is, the amount of the substance is the amount of the substance, and the concentration is also so pH=14—