Fm ratio and the operation of an activated sludge process. Activated sludge the activated sludge method, first instigated in 1914, involves developing a culture of bacteria and other organisms in a large tank and on lanes containing the settled sewage. Activated sludge process water treatment waste water. Highpurity oxygen activated sludge is characterized by the use of highpurity oxygen instead of air for aeration. To minimize the energy consumption of the activated sludge. However, improved process control can be obtained by systematically looking at the problems and their potential causes. The excel formulas use parameters like biochemical oxygen demand bod, waste water flow rates, and total suspended solids concentrations to make activated sludge aeration tank design and operation calculations. Activated sludge water and wastewater software solutions. Enrol today in our site and get access to our study package comprising of video lectures, study material, practice questions and test. Course home syllabus calendar readings lecture notes assignments exams projects download course materials. The most common suspended growth process used for municipal wastewater treatment is the activated sludge process as shown in figure. The process consists of delivering clarified wastewater, after primary settling, into an aeration basin.
Sourcedr absar kazmi, training course by department of civil engineering, iit roorkee. Activated sludge as is a process dealing with the treatment of sewage and industrial wastewaters and developed around 19121914. Troubleshooting activated sludge processes introduction. In activated sludge process wastewater containing organic matter is aerated in an aeration basin in which micro. Depending on the design and the specific application, an activated sludge wastewater treatment plant wwtp can achieve biological nitrogen n removal and biological phosphorus p removal, besides removal of. The activated sludge excess biomass or cell mass removed from the secondary treatment process. Find materials for this course in the pages linked along the left.
The weight of microorganisms under aeration, from fm ratio and the operation of an activated sludge process gary lee mishoe gary lee mishoe, cao, is the utilities director for lake placid activated sludge process ranges for. Activated sludge process video tutorials video lecture for. Activated sludge process plants are good choices too for isolated facilities, such as hospitals or hotels, cluster situations, subdivisions, and small communities. Lecture notes water and wastewater treatment engineering civil. Four common variations of the activated sludge process are. Browse through water and waste water engineering civil engineering video lectures by prof. Optimization of the activated sludge process request pdf. Boththe influent wastewater and recycled sludge enter at the head of the tank and are aerated for about 5 to 6 hours for sewage treatment figure 19. Nptel, online courses and certification, learn for free. Municipal wastewater collection and treatment philosophy.
Activated sludge process the activated sludge process is an aerobic, continuousflow system containing a mass of activated microorganisms that are capable of stabilizing organic matter. The activated sludge process is widely used by large cities and communities where large volumes of wastewater must be highly treated economically. In this system, wastewater is added to a single batch reactor, treated to remove undesirable components, and. Activated sludge process, design criteria engineering articles. L24 activated sludge process parti environmental engineeringii 2. Conventional activated sludge extended aeration completely mixed activated sludge the contact stabilization process. The objective of this talk is to make you aware of some of the typical microbial. Activated sludge three steps to improve your process efficiency. Oxygen in the form of air or pure oxygen is forced into the sewage by mechanical means to sustain the oxidation process, more sludge is made. Total solids can be classified as either suspended solids or filterable solids by passing a known volume of liquid through a filter. Get activated sludge process video tutorial, complete information for activated sludge process with examples for full functionality of this site it is necessary to enable javascript. The process may be conventional activated sludge or tapered aeration or even step aeration or even contact stabilization. Learn for free, pay a small fee for exam and get a certificate. There is a large varity of design, however, in principle all as consist of three main components.
Activated sludge design equations iowa state university. Lockett, added the concept of recycling sludge and patented the process. Lecture notes water and wastewater treatment engineering. Davyhulme sewage works, manchester, uk, first full. Jenkins, richard and daigger 1993 discussed severe foaming problems in activated sludge systems.
Activated sludge process, design criteria engineering. This activated sludge training manual was prepared by the michigan department of environmental quality, operator training staff. Activated sludge package plant at mason dixon elementary school in monongalia county, west virginia. Explaining the activated sludge process national environmental. Nptel provides elearning through online web and video courses. Plant effluent bod5 of 12 mgl biomass yield y of 0. Lecture 21 biological unit processesactivated sludge process. For most treatment plants, this will be a portion of the return activated sludge ras flow stream. The weight of microorganisms under aeration, from fm ratio and the operation of an activated sludge process gary lee mishoe gary lee mishoe, cao, is the utilities director for lake placid activated sludge process ranges for fm ratio control. The sewage is given treatment in the primary sedimentation tank. The activated sludge process is the one of the main in sewage treatment waste water treatment process. Activated sludge process solved examples waste water. Excess activated sludge withdrawal system and subsequent treatment and disposal of waste sludge. This paper presents a multiobjective model for optimization of the activated sludge process asp in a wastewatertreatment plant wwtp.
Activated sludge contains a large number of aerobic bacteria and other organism and acts as a fertilizing constituent agent when it is mixed with raw sewage containing sufficient o 2, the bacteria perform two. The activated sludge process is a type of wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa. Introduction the activated sludge process is very widely used for biological wastewater treatment. An important part of the municipal wastewater treatment is the bodremoval. As a suspendedgrowth biological treatment process, activated sludge utilizes a dense microbial culture in suspension to biodegrade organic material under aerobic conditions and form a biological floc. Activated sludge method, sewagetreatment process in which sludge, the accumulated, bacteriarich deposits of settling tanks and basins, is seeded into incoming waste water and the mixture agitated for several hours in the presence of an ample air supply. Integrated fixed film activated sludge ifas hybrid treatment system that combines fixed film technology with conventional activated sludge immerse a solid support media into an aeration basin with suspended biological growth the immersed media provides surface area for biological growth to. Civil engineering water and waste water engineering nptel. Activatedsludge method sewage treatment britannica. Those are measurements done on composite samples for compliance purposes.
In the activated sludge process, a bacterial biomass suspension the activated sludge is responsible for the removal of pollutants. A reactor in which the microorganism responsible for treatment are kept in suspension and aerated 2. Activated sludge waste water treatment calculations with. Wastewater technology fact sheet sequencing batch reactors description the sequencing batch reactor sbr is a fillanddraw activated sludge system for wastewater treatment.
Processes, activated sludge process and its modifications, attached growth aerobic processes, tricking filters and rotating biological contactors, anaerobic treatment, suspended and attached growth, fluidized bed, sludge blanket systems, nitrification, denitrification, phosphorus removal. Fundamentals of wastewater treatment and engineering. Activate sludge of asp activated sludge process contains good number of. Activated sludge treatment process concept and system design. Activated sludge process contd video lecture water. Oct, 2016 optimization of the activated sludge process, and return activated sludge flow rate, requires careful management of three critical parameters. Experience shows that controlling the activated sludge process is still difficult for many plants in the united states. Nptel provides elearning through online web and video courses various streams. Davyhulme sewage works, manchester, uk, first fullscale activated sludge plant. Activated sludge contains a large number of aerobic bacteria and other organism and acts as a fertilizing constituent agent when it is mixed with raw sewage containing sufficient o 2, the. Assume the following for the activated sludge process.
The activated sludge process is one of the most commonly used for secondary wastewater treatment. Rebecca stott, in handbook of water and wastewater microbiology, 2003. Activatedsludge process the activatedsludge process is an aerobic, continuousflow system containing a mass of activated microorganisms that are capable of stabilizing organic matter. The settled sewage form the primary sedimentation tank is the mixed. Activated sludge process was developed in england in 1914 and was so named because it involved the production of an activated mass of microorganisms capable of aerobically stabilizing the organic content of a waste water. Activated sludge waste water treatment calculations are made easy in u.
Activated sludge design, startup, operation, monitoring and. Mar 02, 2016 activated sludge process most commonly used secondary treatment process microbes, mainly aerobic heterotrophic bacteria, are involved designed to remove soluble biodegradable organic matter removal of nutrients, tss, pathogens and heavy metals is coincidental usually clarified sewage primary effluents is treated primary. Since the whole process takes place in a liquid medium the hydraulic regime essentially in the aeration tank and final sedimentation tank. The paper they published in 1914, first used the term activated sludge. In practice the following operations are carried out in an activated sludge process. Activatedsludge method, sewagetreatment process in which sludge, the accumulated, bacteriarich deposits of settling tanks and basins, is seeded into incoming waste water and the mixture agitated for several hours in the presence of an ample air supply. This course includes background on biological wastewater treatment, a general description of the activated sludge process, information. Activated sludge process activated sludge wastewater. Activated sludge wastewater treatment plant modelling and. Each box will either request more data or identify the issue. In a sewage or industrial wastewater treatment plant, the activated sludge process can be used for one or several of the following purposes. Notes on activated sludge process control page ii total solids are defined as all the matter that remains as residue upon evaporation at 103 to 105 oc. This biological process is an aerobic process and takes place in the aeration tank, in where the wastewater is aerated with.
Over the years, wastewater professionals have based their control decisions on measurements from batch tests supplied to various samples or from infrequent laboratory analysis. Assume average flow conditions and the primary treatment performance as in part d above. This sludge dewatering handbook will present the key parameters to take into account in order to optimize sludge treatment with snf floergers organic polymers. In this system, wastewater is added to a single batch reactor, treated to remove undesirable components, and then discharged. The sludge resulting from this process represents the next challenge for the water treatment industry, in particular the minimizing of its volume. Integrated fixed film activated sludge ifas hybrid treatment system that combines fixed film technology with conventional activated sludge immerse a solid support media into an aeration basin with suspended biological growth the immersed media provides surface area for biological growth to attach or park. Activated sludge treatment process concept and system. The activated sludge process in1914, british researchers edward ardern and w.
Tricking filters and rotating biological contactors. Activated sludge calculations with excel ced engineering. In conventional asp the flow model in aeration tank is plug flow type. Nptel syllabus environmental engineering web course course outline. Activated sludge may be define as the sludge which settled down after the sewage has been agitated freely in the presence of abundant atmospheric oxygen. The general arrangement of an activated sludge process for removing carbonaceous pollution includes the following items. Activated sludge process design calculation, example with. Operational control procedures for the activated sludge. Activated sludge process contd click on the video link shown below to play the video on youtube. The removal of bod is done by a biological process, such as the suspended growth treatment process. In the activated sludge treatment process, the removal of suspended solids from wastewater is usually through gravity separation in a clarifier.
1211 907 573 529 477 546 1624 1512 991 939 1439 1052 826 597 387 540 654 1587 1288 663 1612 715 855 821 328 118 77 1032 1385 528 220