15 Principles of biological reactions生物反应原则Biological reactions may be classified ad aerobic, anaerobic, or photosynthetic according to the predominate type of microbial activity and all three are of importance in biological processes used for wastewater treatment. there are several basic principles which are common to all three of these classifications. In each ease a source of cellular building blocks, such as carbon, oxygen, hydrogen,nitrogen,and phosphorous as either organic or inorga
