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Which process could avoid discharging large quantities into the river?

(a) Filtration

(b) Centrifuge distillation

(c) Re-injection

(d) Condensation

The question was posed to me in an online interview.

Query is from Problems Associated with Geothermal Conversion in chapter Ocean Energy & Geothermal Energy of Energy Engineering

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Right option is (c) Re-injection

The best explanation: Re-injection could avoid discharging large quantities of heat into rivers, with consequent hazards to fisheries, and would also avoid infecting rivers and stream with toxic substances emitted from the bores which would endanger downstream with toxic substances, water supplies and farming activities.

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