New methods for treating dewatered sludge
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This post was last edited by zfc318 on 2009-6-18 at 11:49. Today I watched an environmental protection program that discussed a toilet paper manufacturing plant whose process wastewater generated dehydration sludge and cow dung during wastewater treatment; these two materials were mixed in a 1:1 ratio, and earthworms were then introduced into this mixture. As the earthworms consumed this “food,” they multiplied rapidly. The earthworms can be used as feed for poultry, while the remaining material after use serves as high-quality organic fertilizer for use as soil amendment for flowers and other plants. I wonder if everyone is aware of this processing method? ? ? Please discuss, with the focus on whether this can be applied in other industries. As for the video, their dewatered sludge is white, with what appears to be a large amount of wood fibers in it.
Why isn’t anyone discussing it? Isn’t it a new approach? Hehe, at least I’ve never heard of it before! ! !
It sounds like a very good way to handle sludge. However, when we applied this method in practice, we encountered some issues that were not mentioned in the introductions: there needs to be sufficient storage space, measures to prevent leakage, enough time for the earthworms to digest the material, and a market for the resulting product. Actually, everything is a headache. (Also a paper mill)
Research on this has been going on since the 1980s; it was used at that time for the treatment of household waste. It can’t be considered a new method, and moreover it still fails to address the issue of heavy metal accumulation
Although this is a new approach to sludge treatment, a large amount of sludge cannot be treated in this way. Moreover, different wastewater treatment plants produce sludge of varying qualities, and the harmful substances present in that sludge also differ; it is not certain that this method can be applied to all cases.
Regarding the explanation for the third floor, I’d like to add that the company’s owner owns dairy farms as well as large areas of forest land; therefore, the availability of space and cow manure is convenient. I was also concerned about whether heavy metals might have an impact on them, but I didn’t consider leachate.
There are too many types of sludge, and their compositions vary; not all sludge is suitable for feeding earthworms. Moreover, it seems like it would be difficult to implement this approach
Domestic sludge is relatively easy to treat; if handled in the way suggested by the original poster, many factors need to be taken into account, such as the environment, temperature, and climate conditions. If the levels of toxic substances and heavy metals are within acceptable limits, drying treatment can be applied to convert them directly into organic fertilizer. If the levels of heavy metals are too high, they can be concentrated and then burned using CFB technology; the volume can be reduced to one-tenth after concentration, and there are many successful cases in this area as well!
Biological composting does indeed have a promising future
This post was last edited by johncom on 2009-5-5 08:51. It is indeed a good method, but promoting its use might bring up many issues. First, it’s unclear whether earthworms can tolerate the solid waste from other industries – will they die after just a few days? Do they like to eat such materials? I’m not very familiar with the cultivation cycle of earthworms, nor whether it’s easy to breed them; after all, once this method is put into use, a large amount of biomass will be required. There’s also the issue of time – how much can be processed in a given period. If the processing time is too long, the space required will be large, and it seems difficult to find a solution for this issue at the moment. Moreover, under normal circumstances, there isn’t enough cow dung available; so how can the leachate and unpleasant odors generated by it be dealt with? Generally, more mature technologies are better suited for promotion; if it can be implemented, it can indeed be a good solution for a certain area.
It might work in some industries, but not in those with high pollution levels; earthworms may not be able to survive there