This method of treating sewage was developed by Dr. Pasveer In Netherlands by treating raw  sewage from small communities. No primary treatment is required here. and thus there is no problem for digestive and disposing of  the settled primary sludge. In essence, this method consists of an...

Water Treatment of Silica Natural waters, generally, contain about 5-8 mg/l of silica (Si0,). Another important source of silica in water is the sand watertreatments  filter. When water treated by lime-soda process is filtered through a sand water filter, a good amount of silica dissolves in it...

Sewage Water Analysis BOD The presence of free oxygen is necessary for the livelihood of organisms present in the sewage water The aerobic action continuous till the free oxygen is present. As the oxygen exhausts, the anaerobic action or  putrification starts, when complex organic compounds split...

OXIDATION PROCESS IN SEWAGE WATER Types of Bacterias in Sewage Aerobic Bacteria Anaerobic Bacteria Sewage water (wastewater ) consist of both aerobic bacterias and anaerobic bacterias, These bacterias can make the oxidation of organic compounds present in the sewage water. Aerobic Oxidation In...

The extended aeration process is one of the modifications of the ASP. It is a complete mix system and provides biological treatment for the removal of biodegradable organic wastes under aerobic conditions. Air may be supplied by mechanical or diffused aeration to provide the oxygen required to...

Sewers Small diameter gravity sewerage (SDGS) also known as settled sewerage and solid free sewerage, is a system for conveying domestic wastewater which has been settled in a septic tank (referred to interceptor tank) . It was developed in Zambia in 1960, to remove the settled wastewater from...

Sewage Water Treatment Some metals compounds level only are essential to live for animal, Plant and human being.  Out of that  metal compounds are  toxic to aquatic organisms may find their way into municipal sewerage through industrial discharges and present in significant concentrations in...

Operational considerations. Septicity and dangerous gases: Septicity occurs when sewage is retained in the sewers for extended periods in unaerated conditions. Hence, special corrosion prevention measures for the pipes will be necessary. Further dangerous gases may be present in the sewers and...

Design sewage flow is the expected maximum discharge in the sewer during the life of the system. This is arrived by multiplying the population expected at the end of the design period with the per capita sewage flow and a peak factor. Design Period The length of time up to which the sewerage...

Table A lists the characteristics of domestic wastewater of different strengths. The strength of the domestic wastewater varies with the per capita water supply available. Since the per capita contribution of organic matter is constant (only a slight variation due to food habits) the strength of...

There is increasing recognition that stormwater management needs to be undertaken in a safer and more ecologically sustainable manner. Stormwater should be regarded as an asset and a resource to be valued, rather than considering it as a nuisance to be disposed of as quickly as possible. A...

Comparison of pipe materials suitable for sewers are furnished in below Table. The pipe materials recommended for gravity sewers are indicated in below...

Waste Water Treatment Activated sludge process The Activated Sludge Process is the one of the main in ( sewage treatment ) waste water treatment process. Activated sludge process was developed in England in 1914 and was so named because it involved the production of an activated mass of...