Questions about mixing sludge and lime
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The heat of 1kg lime can evaporate about 0.5kg of water and combine with 0.32kg at the same time. If heat loss is not included, for 1 ton of 80% sludge to 20% sludge, the amount of lime added should be 700kg, which is 70% of the amount. Suppose lime (x)t is added, then (x+0.2)/(x+0.2+(0.8-0.82 * x))=0.8 It follows that x=0.7 tons. If 1 ton is 80% sludge to 50% sludge, the amount of lime added should be 370kg, which is 16.5%. Capacity increased by 6%. It can be seen from the above calculation that the amount of lime added is relatively large, but it can be seen that many sludge granulations can reach a moisture content of 50% without heating. Somehow?
Please explain the question in detail. Is the purpose of mixing sludge with lime to neutralize it or what?
Just so that the sludge can finally find a way out
No one has replied. It seems that this conventional method has few followers.
According to the original poster’s calculations, it seems that the reduction has not been achieved, which is consistent with* * The reduction policy is inconsistent
I don’t understand. Do you want to deal with the sludge? But I have never seen this method. Consider digestion, incineration or composting, etc.
Without heating, the moisture content of the sludge reaches 50%, which is a bit suspended. As we all know, the moisture content of sludge after dehydration is generally 75-80%. If it is not heated, the moisture content will still remain at this base. Of course, without heating, you can also add some substances to cause chemical reactions to exotherm to reduce the moisture content of sludge, such as lime. However, reducing the moisture content through this method firstly results in high cost of treatment, and secondly increases the total amount of sludge, making subsequent treatment more expensive, which is of little significance. In fact, lime must be added to the sludge during the composting process, mainly for its sterilization function.
The purpose of reduction cannot be achieved. Can be sterilized. It seems to be more mature abroad.
I once heard someone who bought a plate and frame filter press say that some municipal sludge is added with a small amount of lime before dehydration.