There is a saying: Listen to the Jun words, read the book ten years. Xiaobian think it makes sense, some knowledge of optical reading may not have to read and understand, read it may not necessarily be applied to practice. So, want to quickly learn to want to learn the knowledge or have to rely on the experience of the previous summary, to ensure less detours! Here is a ten years engaged in high-salt wastewater treatment counterparts, the practical experience of the appropriate value of the full score for high salt Wastewater treatment has a wealth of experience for everyone, especially the water soon after the Friends of the reference, full of wastewater treatment is the essence of ah.
First, the treatment of high salt wastewater using what method
First met the high salt wastewater ---- Biochemical: No;
Salt tolerance biochemistry: feeling cheated;
Dilution of biochemical: high water costs, large displacement, the effect is poor (if diluted enough to smooth the degree of biochemical that much water, unless your raw water is small), does not work;
Evaporation of high salt wastewater ------ No suitable equipment, high operating costs, stranded;
High salt wastewater treatment technology inspection ------ Membrane technology Desalination: equipment is expensive, easy to plug, easy to pollute, and the concentrate can not handle, not suitable (if you have a good understanding of the principle and application of membrane technology, and Understand what is "waste water", you will know the meaning of not suitable);
Then study ------ Electrolytic desalination: electrolysis of wastewater containing sodium chloride, both the membrane or diaphragm method, because of the problem of organic matter can not meet the electrolysis requirements. Take a step back and say that even if feasible, you can solve the problem of plates, safety issues (you can not always build a chlor-alkali plant in your wastewater treatment plant), follow-up issues, etc. Wastewater containing other salts will not do much.
The end of high-salt wastewater ------- Only evaporation, as long as there is a suitable device to separate the salt in the form of solids, high operating costs, after all, is a solution to the problem.
Water friends, high-salt wastewater Do not salt tolerance bacteria (salt tolerance limited by organic matter in the wastewater composition), membrane desalination (wastewater composition is too complicated and it is only the concentration process rather than the separation process, the wastewater Simply not suitable), electrolysis of salt (the reason why the waste water, the wastewater is not only containing salts, the other substances contained in it will cause you simply can not go on electrolysis, electrolysis can not desalination, the material is conserved, the cation Is not edible, and that is how to desalinate it?) And other technical newspaper hope! Those are not suitable for use on the "waste water"! Remind you to take detours, for reference purposes only.
Finally, we need to deal with the "waste water", there is not only involved in the salt!
Second, then the experience of ten years, the so-called high salt in the end is how much content for biochemical, how much for evaporation?
At first glance, this issue is only a question raised by a novice. In fact, it is a question of masters. This issue is also a confused one for many people. I even consulted with many experts on this issue and did quite a lot of tests.
Shallow experience to share with you: In fact, no matter who asked this question is one-sided opinion, because different wastewater biochemical on the salinity, salt types of fitness has a great difference, and none of us can For a variety of wastewater salinity biochemical tests run or run a variety of biological wastewater treatment system, so the biochemical adaptability of the salt content is difficult to be conclusive.
In general, for industrial wastewater, the content of inorganic salts exceeds 1% (without measuring the salt content by conductivity method, but measuring the salt content by incineration), which affects the biochemical composition, and the degree of influence is related to the composition of organic substances in wastewater ; More than 1.5%, not biochemical does not go down but your biochemical effect will be greatly reduced; more than 2% (high B / C value of water) for biochemical be careful. Microbial organisms, osmotic pressure needs to be balanced.
Some comrades asked the salinity of sea water generally 3-4%, why so many creatures? That is the result of millions of years of evolution!
Some of the salvage may be higher engineering adaptation, pay attention to what I said is large-scale, stable, long-term operation of the project.
If you also think that there are indeed high salinity of the project is running, then think about it: what method to measure salinity, accurate? You are the result of salinity and operating results heard, or run it yourself , How long it has been operating, how much it costs to operate, and avoiding hearsay.
As for how much salt is suitable for evaporation (only inappropriate for salt content, not for cost), from our current equipment, more than 3% can (and is not suitable for) evaporation, most suitable for lower salt content 5 %, The upper limit of the solubility of different salts in water.
Put aside the salt content, suitable for evaporation is the key to the maximum amount of water, in addition to water quality. See everyone is concerned about the high salt water, indicating that many water friends have been exposed or are in contact with this wastewater. Many water friends mention very insightful.
Third, running costs, energy conservation issues, dilution of biochemical problems, I would like to then share with you.
Dilution + biochemistry is indeed an effective way to deal with high-salt wastewater. Suppose it is a good measure to dilute river water and domestic sewage, but it is not suitable for the high-salt waste water. Otherwise, the cost of dilution water will not be enough ( Many places are now short of water);
Even if the dilution water is not expensive, but also to build a large biochemical treatment facilities. In fact, the cost of evaporation is indeed very high, here we deal with a ton of waste water costs about 30 dollars, steam is equipped with their own coal-fired boilers. The cost is high, but after all, you can solve the water problem in one step.
But also consider the evaporation of fresh water reuse. As for the stability of the operation of the evaporation system, and wastewater characteristics, salt characteristics, salt content, daily operations, etc., but these problems can be solved according to the specific circumstances.
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