Wastewater discharge from the purification section
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In the purification section, most manufacturers use a combination of power wave technology, air towers, packed towers, and two-stage electrostatic mist removal. The acid circulating in the power wave system contains acid sludge from the flue gas, and the amount of this acid sludge is considerable. Our factory uses CN filters for treating this sludge, but the bottom stream, which contains 10% acid sludge, cannot be transported properly through pipes; it is also difficult to process once it reaches other sections. Please share your ideas – what methods have proven effective?
Transporting dilute acid containing 10% acid sludge is not a problem; for example, rubber-lined pumps or hose pumps can be used, and plastic pipes (PE) will suffice for the pipelines； As for the final treatment of acidic sludge, it can be processed using a press or a vacuum ceramic filter to achieve solid-liquid separation, with both methods yielding good results.
Wasn’t a inclined tube settler used? Acid sludge can be filtered using a frame plate filter press; if that’s possible, let’s discuss it
Due to environmental regulations, our company is also planning to develop a wastewater treatment plan for sulfuric acid production. Initially, we are considering using plate and frame filter presses for filtration, followed by pH adjustment. Is this approach feasible?
It’s feasible. Our company has designed dozens of sulfuric acid wastewater treatment systems for others – no problem at all
You mentioned how to separate the fluids after inclined tube sedimentation – the sludge goes to the filter press, but what happens to the supernatant? How is the water balance maintained in the purification section? If fresh water is used for replenishment directly, then the amount of wastewater to be treated will be enormous
A sludge pump tank is installed below Sean; a rubber-lined pump, a hose pump, or an engineering plastic pump is used, and the pipes are made of plastic (PE) or PP pipes to convey the sludge to the main sewage pipeline or to a separate pipe leading to the sewage treatment plant, where it can then be dried using a plate and frame filter press.
Sean’s products give a mythic impression, and their effectiveness still requires coagulants to be ensured.
How to address the corrosion issue when using a plate and frame filter press before adjusting the pH value?
It is no problem to transport 10% sulfonic acid using PE pumps; after further sedimentation, it is filtered using a PP plate and frame filter press. The resulting filtrate is neutralized with lime or calcium carbide slag before being discharged. The filter cake contains many rare metals that can be sold, and if possible, they can be refined oneself to earn more money. Haha
Sean’s products give a mythic impression, and their effectiveness still requires coagulants to be ensured. It seems like you really know a lot about it. Yes, there is indeed a sense of exaggeration in what you say, haha. But it’s not that exaggerated after all
Personally, I feel that using a sequence of \"power wave + empty tower\" for purification is a bit repetitive and also somewhat reversed, as both of these devices use acid (or water) sprayed to remove dust and generate large amounts of water vapor to cool down (converting sensible heat into latent heat). Since the empty tower is hollow inside, it does not get clogged by flue gas containing large amounts of mineral dust or large particles; therefore, it is usually placed as the first device in the purification process. Moreover, both the power wave system and the air tower are devices that require a large amount of circulating water; in particular, the power wave system needs an even larger volume of circulating water. I personally think this represents some redundancy. I hope the experts here can correct me if I’m wrong.