7 Suspended Growth Biological Treatment Processes 7-1 Introduction to the Activated- Sludge Process Historical Development Experiments conducted at the Lawrence Experiment Station during 1912 and 1913 by Clark and Gage With air input into wastewater, growths of organisms could be cultivated in bottles and in tanks partially filled with roofing slate spaced about 25 mm(1 in)apart and would greatly ncrease the degree of purification
7 Suspended Growth Biological Treatment Processes 7-1 Introduction to the Activated-Sludge Process Historical Development Experiments conducted at the Lawrence Experiment Station during 1912 and 1913 by Clark and Gage With air input into wastewater, growths of organisms could be cultivated in bottles and in tanks partially filled with roofing slate spaced about 25 mm (1 in) apart and would greatly increase the degree of purification
Lockett found that the sludge played an important part The basic activated-sludge treatment process, as illustrated on fig. 7-la and b consists of the following three basic components:(1) a reactor in which the microorganisms responsible for treatment are kept in suspension and aerated:(2 liquid-solids separation, usually in a sedimentation tank; and 3) a recycle system for returning solids removed from the liquid-solids separation unit back to the reactor
Lockett found that the sludge played an important part. The basic activated-sludge treatment process, as illustrated on Fig. 7-la and b, consists of the following three basic components: (1) a reactor in which the microorganisms responsible for treatment are kept in suspension and aerated; (2) liquid-solids separation, usually in a sedimentation tank; and (3) a recycle system for returning solids removed from the liquid-solids separation unit back to the reactor
Fig.//Description of Basic Process
Fig. 7-1Description of Basic Process
An important feature of the activated-sludge process is the formation of flocculent settleable solIds For these applications, various modifications of conventional activated-sludge processes are used including sequencing batch reactors, oxidation ditch systems, aerated lagoons, or stabilization ponas
An important feature of the activated-sludge process is the formation of flocculent settleable solids . For these applications, various modifications of conventional activated-sludge processes are used, including sequencing batch reactors, oxidation ditch systems, aerated lagoons, or stabilization ponds
Evolution of the Activated- Sludge Process A number of activated-sludge processes and design configurations have evolved since its early conception as a result of ()engineering innovation in response to the need for higher-quality effluents from wastewater treatment plants;(2)technological advances in equipment, electronics, and process control;(3) increased understanding of microbial processes and fundamental and(4) the continual need to reduce capital and operating costs
Evolution of the Activated-Sludge Process A number of activated-sludge processes and design configurations have evolved since its early conception as a result of (1) engineering innovation in response to the need for higher-quality effluents from wastewater treatment plants; (2) technological advances in equipment, electronics, and process control; (3) increased understanding of microbial processes and fundamentals; and (4) the continual need to reduce capital and operating costs