Environmental science, engineering & technology History of engineering & technology Technology: general issues adsorption adsorption technology bio-economy calcium carbonate circular economy clay coating corn stream desorption dye eco-adsorbents granular ferric hydroxide green membranes groundwater remediation heavy metal sorption hybrid biosorbent hydroxyapatite isotherm kinetics micro-sized adsorbents nanofiltration optimization process organic acid phosphate removal resource recovery response surface methodology surface-active compounds