A Sewage Sludge Treatment Plant Aids the Final Treatment of Wastewater

Sewage treatment plants treat waste waste water that is collected from domestic, industrial, commercial, and open spaces that collects in these areas and is led through sewer systems to the treatment plant. This sludge treatment facility requires primary, secondary and other treatment of the waste water, through physical, chemical, and biological treatments to treat the waste water and render it harmless before it is led into the environment.

In the primary treatment of waste water, filters are used to remove solid particles which may be of plastic, wood, paper, or vegetable matter. Grease and oil is also removed. The primary sludge is then created by allowing the remaining wastewater to go through sedimentation of the sludge by gravity, flotation, or the use of chemicals, or even a combination of these processes. This sludge settles at the bottom of and forms primary sludge.

Secondary treatment of the waste water allows the wastewater to go through aerobic, anoxic, and anaerobic processes that breakdown the organic matter in the wastewater to create waste biomass or secondary sludge. Click to contact Beston (Henan) Machinery Co. ltd..

What is left behind is the residue after all the treatment processes have been gone through, is referred to as sludge. This sludge then goes through a sewage sludge treatment biochar production equipment for sale. This sludge is semi-solid and like a slurry and has a high water content. Other components in it are organic and inorganic materials, chemicals, plant nutrients, and pathogens that can cause disease. This composition can depend on the original composition of the waste water, and the various treatments that it goes through before the sludge is formed.

There are many ways in which this sludge an be treated. The sludge volume is reduced to half by allowing to go through dissolved air flotation , gravity thickeners, or by air drying them on sand beds which can require a lot of open area. The most widely used processes used in a sewage sludge treatment plant are those that subject the sludge aerobic and anaerobic digestion. In the aerobic process sludge is supplied with oxygen that leads to the formation of carbon dioxide. This is a biological process that reduces the volume of sludge making it easier for drying and eliminates pathogens while it converts to liquids and gases. In the anaerobic process sludge is kept at a certain temperature for 15 to 60 days, and the microbes in the process produce methane and carbon dioxide.

Drying beds are a cheap process of treating sludge that is still used in many developing countries. These beds have drainage pipes at the bottom to drain out the water, and will consist of a 20 cm layer of coarse gravel at the bottom, 10 cm of fine gravel, and two layers of coarse and fine and that can in total have a thickness of 15 cm. This sand acts as a filter that is between the sludge and gravel. The water drains off through the gravel into the pipes laid down. Sludge that is removed from a bed that has dried can be then disposed into landfills. This material can be used for agricultural purposes if it does not contain toxic materials. More about charcoal carbonization stove.