Prof. Abdul A Rahman
 
Prof. Abdul A Rahman


Project development

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Project development

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Greywater

     The wastewater stream produced by a household can be divided into two fractions; the toilet wastes, commonly called black water, and the other bathroom water, commonly called greywater.

Greywater contains soaps, detergents, hair, lint and bacteria and other materials, which include a wide range of foodstuffs. It is estimated that the proportion of greywater from different house fixtures is 5% bathroom basin, 40-80% bath and shower, 10-15% kitchen and 5-20% from laundary facilities. Untreated greywater, especially kept in storage and heavily contaminated with food particles, cooking oils and grease, would quickly turn septic and emit unpleasant odors, and clog pumps and irrigation systems.

Separating greywater from blackwater sources is an advantage, as greywater contains less nutrients and is mainly limited to COD and easier to treat using aerobic conditions and biofilms. The quality of greywater effluent primarily depends on the duration of the biological and chemical treatment of the wastewater; that is, the detension time (usually in days) as the greywater is undergoing treatment.

The concentration of nitrogen in greywater is low. For example, only 2mg/l in a total of 11mg/l of total Kjeldahl nitrogen in combined wastewater. Fifteen percent of nitrogen in greywater and 90% of nitrogen in black water is in the form of ammonia. Tables list typical nutrient concentrations in greywater samples, with effluent from washing machines and laundry facilities having the highest nutrient concentrations and wastewater from the washbasin generally having the lowest. Typical values of greywater volume produced by households vary from 100-200 liter per person per day.

Greywater recycling working model and demonstration


                       Greywater recycling   Greywater recycling

                       Greywater recycling   Greywater recycling

Eco-sanitation projects - Hostels, I.I.T, Madras


Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras

Eco-sanitation projects - Hostels, I.I.T, Madras: Inauguration on August 1, 2005


Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras

Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras Eco-sanitation projects - Hostels, I.I.T, Madras

              Eco-sanitation projects - Hostels, I.I.T, Madras




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