What's Your Opinion on Sludge Drying in Sewage Treatment Process?

..." In fact, centrifugation is slowly becoming one of the most preferred methods of dewatering sludge. By passing the sludge through a centrifuge, it becomes easier to retrieve all the water and enable easier handling of the solid waste in shorter time at reduced costs. Other alternatives include the rotary drum vacuum filter and the belt filter press."...

Hey free movie...

New sludge incineration system with zero-energy consumption

https://www.wateronline.com/doc/step-wastewater-sludge-treatment-process-0001

Thanks for your sharing, yes centrifugation is for sludge dehydration, and what about the sludge moisture content after centrifugation?

Skip the drying and go directly to incineration, accepts 72% moisture content undigested sludge....with net energy use at zero...

https://www.mhiec.co.jp/products/water/sludge/incineration_system_with_zero_energy_consumption.html

So you're not interested in saving money, just promoting your company...?

Not at all, don't think like that. We want to find more new direction to help our clients saving money, the reason I send you web and informations about my company is mainly to hear your suggestions, what the next step we should focus on, now that you think could skip the sludge drying process. What we should do to save cost for clients, protect the environment at the same time, meanwhile make a living.

If I really only want to promote my company, then I can just make advertising and leave instead of searching more voice and good views.

Well I think the technology of incineration should be explored as I have said...I might add that using human waste as fertilizer is dangerous in that prion infection has been shown to survive the waste treatment process and can uptake in plant life and crop produce.....So I would like to hear your opinion on that...

Indeed, the COVID-19 virus can indeed survive in the feces of infected people, so many countries now use industrial chlorine-containing disinfectants to sterilize human waste and medical waste to avoid the spread of the virus. Moreover, in a dry environment， half an hour at 56 degrees Celsius can kill the virus. The feces after double disinfection and sterilization treatment with chlorine-containing agents can be dried and used as fertilizer for crops.

Take it easy, everything will goes better and better finally. For your personal, to avoid the infection by human waste, you have to pay attention on the following details:

1. Cover the toilet lid when flushing the toilet；

2. If you are compelled to use the toilet in a public toilet, please wear a mask and prefer to use a covered, siphonic toilet to avoid flush toilets or squats.

3. Maintain hand hygiene at all times, do not touch the ears, nose, mouth, eyes, and other head parts with your hands, wash your hands before and after meals, develop a good habit of washing your hands often, and avoid crowds.

What does any of that have to do with prions?

...."Prions, rogue proteins that cause incurable brain infections such as Mad Cow disease and its human equivalent, variant Creutzfeldt-Jakob Disease, are difficult to inactivate, resisting extreme heat, chemical disinfectants, and irradiation. Until now, scientists did not know whether prions entering sewers and septic tanks from slaughterhouses, meatpacking facilities, or private game dressing, could survive and pass through conventional sewage treatment plants.

Joel Pedersen and colleagues used laboratory experiments with simulated wastewater treatment to show that prions can be recovered from wastewater sludge after 20 days, remaining in the "biosolids," a byproduct of sewage treatment sometimes used to fertilize farm fields."...

https://www.sciencedaily.com/releases/2008/06/080623093029.htm

Well, I thought you referred the prions before because you worry about the infection in treatment process.

Well the concern in using wastewater sludge as fertilizer is that prion diseased misfolded proteins can be passed to crops and ultimately create a loop where an accumulation of this material equates to viral loading in a host, increasing prion and amyloid related diseases in the general population...add to that drugs that are combining to form who knows what, and the use of incineration for sludge becomes the desired solution....not to mention it saves money....Don't crap where you eat!

Definitily no doubt Incineration is the safest way of turning a problem waste into an opportunity. Mechanically dewatered sludge cannot be incinerated auto thermally, i.e. reaching a temperature above 850°C without the use of auxiliary fuel. Auxiliary fuel is a big operational cost and thus is to be avoided. That is why it is necessary to increase the %DS before incineration.

Generally, the sludge contains 70% -75% free water, 20% -25% flocculent water, and 1% capillary water and bound water. High-moisture sludge directly enters the incinerator, which will have some adverse effects on the combustion process, such as a decrease in incineration temperature, a delay in the ignition process, and temperature fluctuations in the furnace. Reducing the moisture content of sludge is crucial to reducing the cost of sludge incineration equipment and treatment. Generally speaking, reducing the moisture content of sludge to the volatile content is less than 3.5, can form spontaneous combustion, saving fuel.

Sludge has a high water content, and energy will be taken away with the evaporation of water during the sludge combustion process. If the energy is not enough to maintain the sludge combustion, auxiliary fuel must be added. The choice of auxiliary fuel generally depends on the moisture content of the sludge, the nature of the sludge and the temperature of the combustion air.

Sludge drying is a heat consuming process, whereas sludge incineration produces heat. If we could combine the two parts and make it a recycle that would be perfect.

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A real connoisseur of sludge pays attention to what is being served along with it, choosing from doux to semi-doux to sec to brut, which has the least MC.

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Excuse my French, but shouldn't that be "connosewer"?

Connosewer?

Is this your only judgement? So easy to be "cheated". There is a Chinese old saying: 欲加之罪，何患无辞。I guess your French will never understand it's meaning only by translation APPs.

As an academic researcher, please maintain the demeanor and rigor you deserve.

That was just a play on words, but it requires some knowledge of both French and English to be understood.

Exactly.

Thanks for your comments, we care our clients target MC, and their sludge type and original sludge MC, then we choose suitable and economic machine combination for them.

Milwaukee, Wisconsin has been doing it for years. It’s called Milorganite and been selling it to gardeners

Kadant/Grantex have been treating paper mill sludge in Green Bay have been doing it for over 30 years.

Milorganite is banned from organic gardening by the USDA......

Anyway, your worries should be paid attentions on.

For areas with high incidence of protein folding virus such as mad cow disease, it is best not to use sludge as compost for edible crops. It should be incinerated after drying, or used for composting other crops, such as flowers. There are still many countries that cannot afford the cost of incineration and have no relevant awareness, so they still use the composting method.

I agree,...some of the pathogens but in particular the carcinogens are pretty robust, and the only way to destroy it is through high heat in an incinerator.

may be if your company is serious, could sponsor some research. There are research on at several academia on the prion. One is anyway not your concern - training antibodies or even some nano medicines in dissecting prions before they start joining - It seems to have some limited sucecss- for some prions that couple after more than 10 bases have joined. The less base prions are too fast for them to handle.

Another, which too is interesting and that too has some limited success is using enzymes to dissect the prions and thus make them harmless. This is what you could think on , if you have in house research or are ready to back those who are at it. Don't ask me where - but there are papers, even peer reviewed on both these aspects - even with limited success, and only some variants of prions.

It's not a bad idea to sponsor some research on sludge treatment or related project. The would u like to share your local municipal/industry sludge treatment way with me?

Well, Thank you for pointing that out SE, I knew I could count on you for your thoroughness, so let me digress further.

Milorganite was developed in Milwaukee (hence the name) to treat their bigger problems,... from a poorly run city with an over flow of sewage being dump in Lake Michigan. They’ve since somewhat corrected it, but the problems of Milwaukee dumping raw sewage into its surrounding rivers and Lake Michigan is still there.

And it’s backed by the arrogance of liberals bots trying to show their over-educated intelligence and love letting people know by talking smart and down to others.

maybe a ‘controlled experiments, double-blind studies, and replication‘ will help, because ‘we care’.

ohhh,... since I turned it around and back on them, this is going to sting,... again.

I’ll let the bots mark this OT.

oh,... and btw, SE,... have you found anything about the absorbent material Kadant/GranTek produces from paper mill sludge waste?

i used to rebuild and repair some of their equipment. Matter of fact,... one of my classmates I went to college with, his dad actually developed the process for GranTek.

Yeah that's good stuff.....

Thanks for your informations, composting and incineration are solutions worth learning from.