How should the waste residue generated after the treatment of industrial wastewater be disposed of?
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Industrial wastewater contains silica waste in particulate and colloidal forms; what should be done with the silica residue (in particulate and colloidal forms) that results from its treatment? Please help think of a solution.
If the quantity is small or the purity is low, it is recommended to carry out burial treatment. If the quantity is large and the purity is high, comprehensive utilization should be considered, such as calcining silicon micropowder, etc.
First, I would like to know what role silica plays in your wastewater? If the quantity is large, it can be recycled and reused; if it is small, it’s pointless. Of course, this silica can also be accumulated and sent to cement plants as raw materials for cement production or for other building materials, but this requires high temperatures.
It mainly consists of hydrolyzed waste, in a small quantity of about 50 tons per year. There is a challenge here: silica exists in both granular and colloidal forms, and the waste liquid contains hydrochloric acid; therefore, separating the solid from the liquid is a difficult task to handle!
For such systems that are difficult to separate, it is recommended to take a look at information on ceramic membrane filtration.
Ceramic membranes can be considered for the recovery of hydrochloric acid! !
Ceramic membrane filtration can be used for separation, but the equipment cost is extremely high, reaching hundreds of thousands of yuan. After all, this is waste treatment, and such high investment is not cost-effective!