I am interested to know a bit more about the mechanics of pit emptying for latrines and sludge treatment; particularly in rural settings. One specific thing it would be good to know: in urban areas I understand that companies come and collect the sludge, suck it out, then it can be dried for use as a fertilizer or treated and disposed of. But how are pits emptied in rural areas? Do people just dig another hole when the current one is full? What are the implications of this for the superstructure that sits above ground?
Also, what does LLTS stand for?!
If there are any documents or briefing available on pit latrine emptying and faecal sludge treatment that would be great.