Hi Jean,
Thank you for answering my questions and the information about population.
1) The reason I ask the second question is that I don’t know after these years if the original sewage treatment plant has been upgraded or not.
2) And the ‘intermediate products’ in my second question is something left after treating the sewage water, such as sludge, are they directly send to landfill or they are treated then reuse for fertilizer.
Thank you!
Bin Tang