ABSTRACT
This chapter discusses environmental chemistry technology in relation to problems caused by rare metals. Rare metals of 47 kinds including rare earth metals, are useful but expensive materials. Because these metals are rare, both resource development and urban mines are preferable. Environmental science and technology commonly deal with adverse effects using direct methods, indirect methods, and post-restoration methods. Microorganisms are aerobic and from living planktonic organic sludge. Additionally, purification of wastewater and sewage treatment plants, sewage treatment plants, or septic tanks are used widely. Activated carbon is the main ingredient for enhancing the absorption efficiency in the selective separation of certain substances, which are removed, purified, and subjected to chemical or physical treatment as porous carbon materials. Low discharge velocity of emission makes the smoke to get caught in the vortex of air on the leeward side of chimneys, which dramatically increases the pollution directly below the chimneys.
