(a)     Alternative arrangement for sewage disposal : To improve sanitation, low cost on-site sewage disposal systems are being encouraged. Examples are septic tanks, chemical toilets, combusting pits. Septic tanks are suitable for places where there is no          sewerage system. For example hospitals, isolated buildings or a cluster of 4 to 5 houses.
       Some organisations offer hygienic on-site human waste disposal technology. These toilets do not require scavenging. Excreta from the toilet seats flow through covered drains into a biogas plant. The biogas produced is used as a source of energy.