Question 9
In an industrial area, a factory near the upstream of the river discharges high-
temperature waste into the river.
a. How would this discharge affect the number of animals and plants in the water?
b. If the untreated waste materials from factories include high amount of metals,
such as zinc and arsenic, and spread into the river. What will happen initially to
the town people who drink water from that river.
c. The residential area discharges organic matter to the river. How would the
concentration of dissolved oxygen change as water flows downstream from the
residential area?
d. Suggest two solutions without shutting down the factory to improve the quality
of water in that river.
temperature waste into the river.
a. How would this discharge affect the number of animals and plants in the water?
b. If the untreated waste materials from factories include high amount of metals,
such as zinc and arsenic, and spread into the river. What will happen initially to
the town people who drink water from that river.
c. The residential area discharges organic matter to the river. How would the
concentration of dissolved oxygen change as water flows downstream from the
residential area?
d. Suggest two solutions without shutting down the factory to improve the quality
of water in that river.