Each latrine must be provided with a receptacle, into which the buckets are emptied, this being placed in a convenient position at the back of the latrine; the cart starts on its rounds with six empty receptacles, visits the latrines where it picks up the full ones, and replaces them by clean ones. They are supplied in 6, 12 and 24–gallon sizes to suit requirements, and the arrangement avoids the nuisance of transferring the contents to a second utensil.
FIG. 17.—Night-Soil Receptacles and Hand Trucks.
Hand Carts.
Hand carts are necessary in order to remove night-soil from houses built in narrow lanes and places where it is impossible to get bullock carts into. Fig. 17, page [34], shows a convenient arrangement for this. The receptacles vary in size from 12 to 33–gallons, and cost from Rs. 37 to Rs. 68 each; the bodies are detached from the hand truck by simply raising the handles and disengaging the two-forked bearings with the trunnion; they are fitted with a hinged lid and are made of strong galvanized iron; the hand truck is of strong and light design, the whole being of wrought iron.
Cesspools.
Where regularly-flushed masonry-lined side drains are unavailable, the drainage from houses must be led into masonry-lined cesspools, which will be cleaned out daily by the municipal sweepers, and the contents removed in conservancy carts. These cesspools should be semi-circular in shape, and plastered on the inside with Portland cement. In many cases, where masonry drains exist, it will be found possible to intercept this sullage, and purify it through Biological Agency in small tanks, filled with pieces of vitrified brick, broken so as to pass through a 2–inch ring. The broken bricks will last for about a year, when they should be renewed.
Sullage Filter.
A drawing of a small Sullage Filter is given in Fig. [18], page [36]. The estimated cost of which is Rs. 180.
Prompt Disposal.