Stream water pollution due to domestic wastes has been noticed recently with the in crease of residential area in the suburbs. In this paper, some dissolved substances in the drain water were studied, and the daily variation of water concentration and the amount of load per person per day in the domestic drains excluding raw sewage, or human excre ments, were measured in a small residential area near Tokyo.
The discharge of water from the drains shows a maximum peak at 8:00 a. m. and another smaller peak at 8:00 p. m. Electric conductivity is high from 7 to 10 a. m. and from 5 to 9 p. m. Total-nitrogen and ABS have their concentration peaks in the morning, Cl and K+ have their concentration peaks in the evening, and Mg2+, Ca2+ and 4.3 Bxdo not have noticeable daily variations.
Daily variations of the discharge of K+, total-nitrogen and ABS are similar to those of concentrations. Only the discharge of Cl- has its peak in the morning.
The unit load per person per day is revealed to be as follows, K+; 0.65g, Cl-; 3.89g, total-nitrogen; 2.40g, and ABS; 4.46-4.60g.
Geographical review of Japan series A
Geographical review of Japan, Series B.