An Suggestion for Processing of Air pollution in Hong Kong

I am following the similar line of thinking as in the last post. It has been my dream that government build giant air cleaner to remove the pollutant from the air. However, how to maintain it financially? We could see if we could extract useful material (like heavy metal of Aluminum, Lead?) from the collected pollutant, that sell it to local/oversea industry as a supply of metallic material. This is killing two birds in one stone, we can improve the quality of the air(thereby reduce the expense in Department of Health) while making a profitable business. Thus it gives incentive for the government to clean up the air without costing taxpayer a dime. The pain would be how to implement this idea, that belong to the field of chemistries and engineers!

An suggestion for the Processing of Sewage in Hong Kong

This is such a simple and stupid idea I wonder if no government already practicing it. My thought is since it take million of taxpayer’s money to process sewage from all the toilet in the cities, why can’t the Department responsible for processing of sewage SELL the processed material as organic fertilizer? Why must it waste all the money by neutralized all the germ(i.e. fertilizer and nutrients for the plants) then release it into sea? Even if the intend for the process is to minimize the organic pollution to the ocean, we nevertheless pollute the ocean, why should we think ONLY from the perspective of human being but not for plants and animals? Doesn’t we waste all the energy to neutralize all the useful material for the plants in the processing of sewage while commercial entity take energy in the making of them? It is touchy political issue to talk about Polluter’s fee, why can’t we let the polluter’s waste product to pay for its own pollution?