16S rRNA 16s rRNA pyrosequencing Environmental science, engineering & technology European environmental brands Gansu province Lysinibacillus Salmonella Enteritidis Spinacia oleracea microbiota adsorption advection–diffusion–reaction agritourism alpha diversity amplicon sequence variants bacterial community composition biodegradation building components building energy efficiency building modelling calcination carbon regulation chitosan chlorine dosage chromium circular economy contaminated soil contingent valuation cork–graphite electrode dehalogenase-producing bacteria drag drinking water treatment plant