SBR SEWAGE TREATMENT

SBR SEWAGE TREATMENTATMENT

Wastewater treatment by Sequential Batch Reactor (SBR) is a fill-and-drain activated sludge system for wastewater treatment. In this wastewater treatment system, the wastewater is transferred to a single cut-off reactor in order the undesirable components to be removed and then the effluent is discharged. Balancing, aeration and clarification can all be achieved by applying a single SBR unit. To optimize system performance, two or more SBRs are embedded in the sequence of operations. SBR systems have been successfully used to treat municipal and industrial wastewater. These methods have a unique role in the treatment of wastewater with alternating current or low current.

Processes such as the SBR are not a method that has progressed to the present stage. Between the years 1914 to 1920, various full and empty systems were operating. Due to the development of new devices and technologies, the interest in SBR and SSB systems was revived in the late 1950s and early 1960s. The reason was the development of new devices and technologies. Advances in aeration equipment and control systems allowed the SBR and SSB systems to be flourished. That these systems could compete successfully with the conventional activated sludge system.

Dear customers, you can use technical advice before buying wastewater treatment by calling +98(21)66475495 and we respond to you online.

Comparison of SBR wastewater treatment system with activated sludge system

The process of the SBR and SSB wastewater treatment unit and conventional activated sludge are both the same. Report in 1983 by the US Environmental Protection Agency stated the following:

SBR and SSB wastewater treatment is not different from conventional activated sludge system. Except that this system works with time instead of space.

The SBR and SSB wastewater treatment systems operate with a time sequence control. That performs balancing, biological treatment and secondary clarification operations in a pond. This model of reactors practically includes primary clarification.

In a conventional activated sludge system, the above processes must each take place in a separate tank.

In addition to the SBR and SSB systems, they also use the WET-LAND system to improve purification. That system is also designed and implemented based on its scientific principles.

SBR WASTEWATER TREATMENT SYSTEM

Inlet sewage usually passes through a trash collector before entering the SBR tank. The wastewater then enters a semi-filled reactor containing the remaining mass of the previous cycle. When the reactor is full, it acts like a conventional activated sludge system, but without a continuous inlet or outlet stream, when the mass is deposited and organic materials of the wastewater is consumed by micro-organisms, and that’s when biological reactions are complete and aeration and mixing no longer are needed. Excess mass is discarded at any time during the cycle. By keeping and adjusting the ratio of organic matter to the mass in each cycle, the amount of excess sewage sludge is determined. In conventional continuous activated sludge systems, the ratio of organic matter to the mass is regulated by the return of sludge from the settling tank, which depends on the amount of inlet sewage and the characteristics and concentration of the substances in the settling basin and other factors. After the SBR unit, the sewage mass enters a balancing reservoir so that we can enter the sewage at a constant flow rate for subsequent processes. In some cases, the wastewater is passed through the filter to remove excess solids and then disinfected.

In SBR wastewater treatment systems, activated sludge return pumps and primary sludge pumps required in conventional activated sludge systems are not needed. In the SBR system there is usually only one sludge for disposal. The need for non-pressurized condensers prior to digestion should be considered in each case of sewage, depending on the properties of the sludge.

It should also be noted that primary clarifiers are usually not required for municipal wastewater treatment prior to SBR. In all conventional activated sludge treatment plants, primary clarifiers are employed prior to biological systems. However, it is recommended by manufacturers of SBR systems to use primary clarifiers whenever the total T.S.S suspended solids or biochemical oxygen demand (BOD) is greater than 400 to 500 mg/L. It is better to use the stored information from different projects, as well as the suppliers’ information for design, and then to install the basin clearing and balancing for SBR systems in municipal and industrial wastewater.

Balancing may be required depending on what the process is after the SBR. If no balancing tank is used before filtering the wastewater, the filter must be designed in such a way that it can withstand and treat the major wastewater removed from the SBR system. Designing the filter in such a way that the surface of the substrate is able to withstand maximum discontinuous effluent is sometimes not feasible and economical, so it is advisable to use a balancer. Separate balancer is not usually used in conventional activated sludge systems because the output current is usually continuous and constant.

APPLICATION OF SBR WASTEWATER TREATMENT SYSTEMS

SBR wastewater treatment systems are typically used for streams of up to 5 million gallons per day or less. The specific activities and operations required for flows above this level usually make the use of these systems less acceptable for higher flows.

Since SBR systems occupy relatively little space, they are very suitable for areas where land use is limited. Cycles within the system can also easily modify nutrients removal that may increase in the future. This makes SBR systems flexible to changes in input wastewater parameters such as the amount of nutrients in it. SBR systems are also very economical when the filtration after biological treatment is required.

BENEFITS OF SBR WASTEWATER TREATMENT SYSTEM

–      Balancing, primary clarification, biological treatment and secondary clarification can all be achieved in a single reactor.

–      Flexibility in performance and control

–      Minimum placement

–      Reduce per capita costs by removing clarifying units and other equipment.