Treatment of wastewater containing ammonium chloride, sodium chloride, and sodium sulfide

With such high COD levels, the water obtained through direct evaporation still needs to be treated; it’s best to deal with the COD first before proceeding with evaporation to recover salts.

This post was last edited by CoCo070563 on 2015-12-15 at 17:22. If the industrial park has requirements regarding chloride ion emissions, it is possible to follow the approach mentioned above – first removing COD and then dealing with the salt content. If there are no such requirements, our high-salt strain can be used directly; our EMO high-salt strain is capable of withstanding 4-5% inorganic salts. If evaporation is carried out directly, both the concentrated water and the waste salt generated are solid wastes. Currently, there are strict requirements for the disposal of such solid wastes, and the costs involved are very high. If you are interested in our technology, please send the wastewater parameters to yaohongying_66725080@126.com so that we can discuss further.

Thank you for all your suggestions. If we follow the approach of first removing COD and then evaporating for salting out, what would the cost be approximately? An investment budget needs to be created

How much to invest depends on your volume – what’s the approximate hourly traffic volume in your park? In any case, the costs are not low

May I ask, what substances are present in your high-salt wastewater, whose COD is around 60,000? I only know that there is some toluene; what about the other substances? Do you know? We can help you try to solve the COD issue, but you need to consider what to do with the salt that remains after evaporation.

How is the water level? Could direct electrolysis and evaporation concentration be considered?

With such a high salt content, use MVR directly for crystallization

This post was last edited by zhaolijun on 2015-11-28 at 15:46. Such high levels of salt can basically only be removed through evaporation, but this is possible only if the organic substances are first removed thoroughly, after which the salt can be separated and used as a by-product

This post was last edited by CoCo070563 on 2015-12-15 at 17:23. For the water samples from your company, the following steps are generally followed: 1. Remove organic substances through appropriate pretreatment methods, eliminating more than 85% of COD, and neutralize it； 2. Evaporation: This is typically carried out using MVR or multi-effect methods, with salt separation achieved through physical and chemical processes ； 3. The salts are reused afterward, while the condensate is sent to biochemical treatment or recycled. The most important aspect is the preliminary preprocessing; if this is not done properly, the evaporation process later on will be blocked, resulting in low evaporation efficiency. Over time, the system will essentially stop functioning. Additionally, the quality of the salt produced will be very poor, making it unusable. If you are interested, feel free to contact me.