The precipitated materials produced during the treatment of sewage in many urban sewage treatment plants can easily form sludge. And this sludge has high water content & a strong odor, is perishable. Then it contains parasite eggs, pathogenic microorganisms and heavy metals. So if you don’t handle it properly and discharge it arbitrarily, it will cause secondary pollution. At the same time, on 31st March 2024, a customer from American inquired about this. He wanted to process the sewage sludge through using professional machines.
What do you need to do before sewage sludge composting?
This American client prepared to compost sewage sludge. But before composting, you need to remove excessive moisture from sewage sludge, crush into pieces and mix with other materials. Why?
Dewatering sewage sludge
Generally speaking, the moisture content of sludge is about 80%. So you must adjust it to 55%-60% before entering the aerobic fermentation process. There are two types of dehydrators for your choice, one is a screw squeeze dehydrator and the other is an inclined screen dewatering machine.
Crushing sludge into pieces
If you want to decompose sludge quickly, it is an ideal choice to crush it into fine powder before composting. Because when agglomerated sludge become fine powder, it will have a larger contact area with oxygen. Then what equipment is suitable for sewage sludge crushing? Vertical type crusher and semi-wet material grinder are both excellent choices, because they can process high moisture material without blocking.
Mixing with materials
The most suitable C/N ratio for sludge aerobic fermentation is (25~35):1. If the C/N is not within the appropriate range, you should add materials with higher carbon content to the dewatered sludge, such as sawdust, straw powder, fallen leaves, etc. And if you want to take full advantage of them, it is necessary mixing them with sludge evenly. Here, we can provide you with various fertilizer mixers for your choice.
What compost turner is suitable for processing sewage sludge?
The above are details about our communication with the customer about sewage sludge composting in America. In addition, we also have other sludge disposal plans for your choice. Such as sludge organic fertilizer production system, sludge organic fertilizer pellet making plan, other sludge compost lines, etc.
