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Posted by: Michael Cochrane on 11/4/03 Title: What happens to sludge?
Postnum: 205 EntryID:957
I've been reading a lot about the treatment of residential wastewater, and in almost every case there is a step that involves the disposal of sludge. I haven't been able to find any more detail than this. My question, therefore, is what happens to the sludge? Are there further treatments that get applied to it such that it can be 'dumped' into the environment safely? Even if it is 'dumped' safely, wouldn't continuous dumping in a specific area eventually cause a problem? If anyone here can point me to a website or link that has this information, I would most certainly appreciate it.

Responses

Posted by: mike Johnston on 11/10/03 Title: Re: What happens to sludge?
Postnum: 205 EntryID:959
Residential waste sludge is commonly processed into retail fertilizer and land applied as fertilizer to farms. There has been some concern of late due to the possible presence of pathogens and heavy metals in the sludge. There are several articles in the MSN environmental news section as well as on the waste news web site. Industrial sludge is commonly burried or treated as Hazardous waste. Mike J.

Posted by: Mike Johnston on 11/10/03 Title: Re: What happens to sludge?
Postnum: 205 EntryID:960
I found an article in the October 27th 2003 issue of Waste News that talks on this subject.

Mike J

Posted by: English, J. Stephen on 1/13/04 Title: Re: What happens to sludge?
Postnum: 205 EntryID:1014
Sludge or Bio-Solids are usually first processed on site at a Wastewater treatment plant, this treatment generally consists of an anerobic digestion process. This digestion process converts some of the volitile organic matter into methane gas, which can be used onsite, it also helps to reduce/eliminate the pathogens the sludge. The sludge can now be handled several ways; 1)it can be de-watered/dried using a filter press or centrifuge, the dry cake can either be incinerated or landfilled, 2) the liquid sludge can be land applied to enrich the nutrients of agricultural land, O.Reg. 267/03 THE NUTRIENT MANAGEMENT ACT, 2002 regulates the land application of sewage sludge.


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