These include biodigester septic tanks for treatment of domestic sewage anaerobic pond systems for treating agricultural processing wastes and anaerobic sludge reactors for the treatment of food processing waste water.

While high density urban settlements generally require sewerage networks and waste water treatment facilities, in low density settlements on site sanitation, such as septic tanks with sludge removal, may be an option with significantly lower costs.

Septic or soakage pits can be used for secondary treatment.

But, of course, they don't look like rocks and sludge now.

Even in the absence of any of these factors, however, septic arthritis may be present.

Large quantities of mercury were detected in fish, shellfish and sludge from the bay.

In rural areas, most sanitation investment, usually for latrines or septic tanks, is undertaken by individual households.

Oil sludge constitutes the most important type of solid waste in terms of quantity (Linden et al., 1990).

They are used in remote areas where use of septic tanks is limited, usually to reduce nutrient loads in lakes.

Jordan states that these springs were contaminated by septic tanks and latrine pits at refugee settlements or by wastewater treatment plants.

Such franchises may cover local sanitation network extension, sludge removal and disposal, sewage collection and treatment and other service delivery.

It can wash the sludge off high mountain peaks and hills, down into the lowlands. So stop and think for a minute.

If we look around us, much of what surrounds us started life as various rocks and sludge buried in the ground in various places in the world.

Between 1994 and 2002, the proportion of homes with improved sanitation services, defined as a lavatory bowl connected to a drainage system, a lavatory connected to a septic tank, or a flush toilet.

Videos of the open sewage drains in front of the school, of the 3 classrooms for more than 240 students and the septic tank which overflows in the backyard provide visible proof of their needs.

But these haze particles, it was surmised, before we got there with Cassini, over billions and billions of years, gently drifted down to the surface and coated the surface in a thick organic sludge.

Sewage is produced by all human communities and is often left to compost naturally or is treated using processes that separate solid materials by settlement and then convert soluble contaminants into biological sludge and into gases such as carbon dioxide or methane.

And the tourist brochures pointed me in the direction of this bridge I love bridges, metaphorically and symbolically and structurally and it was a bit of a disappointment, because of the sludge from the river was encrusted on it it really wasn't in use.

These are the Athabasca tar sands, and there's an enormous amount first of mining, the largest trucks in the world are working here, and then you've got to pull out this black sludge, which is basically oil that doesn't flow. It's tied to the sand. And then you've got to use a lot of steam to separate it, which only works at today's oil prices.