Xử lý nước thải bằng công nghệ sinh học

Biodegradation efficiency enhanced 10%~30% Short Hydraulic Residence Time (HRT) Long Sludge Residence Time (SRT) Activated sludge increase by 2~3 times No secondary settling and disinfecting tank required Automatic control operation is possible Better control of biological activity Quality Effluent that is free of bacteria and pathogens Smaller plant size Higher organic loading rates
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Xử lý nước thải bằng công nghệ sinh họcMembrane Bio- R eactorWastewater and Effluent Treatment:A Review of Membrane Bio-Reactor TechnologyPLUS-POINTS of MBR > Biodegradation efficiency enhanced 10%~30% Short Hydraulic Residence Time (HRT) Long Sludge Residence Time (SRT) Activated sludge increase by 2~3 times No secondary settling and disinfecting tank required Automatic control operation is possible Better control of biological activity Quality Effluent that is free of bacteria and pathogens Smaller plant size Higher organic loading ratesReview of MBR - Hydro One 1www.hydro1.com.myMEMBRANE BIOREACTOR (MBR)FORADVANCED WASTEWATER TREATMENT & Why MEMBRANE Technology? embrane technology has advanced significantly in the past decade, for both water M purification and wastewater treatment. Today, membrane-based systems have become the preferred technology for many potable water purification applications: Cryptosporidium and Giardia control, color or suspended solids removal, etc. Most recently, the combination of membranes with the activated sludge process has redefined basic sewage treatment, optimizing the biological treatment operation and yielding a treated effluent that is ideal for reuse. ▪ Two key advances in membrane technology are at the leading edge of this trend: a.)Quality & bacteria-free effluent with high efficiency in removing organic & inorganic matters b.)Minimum plant size with elimination of conventional element c.) Stable & efficient biological process is maintained ▪ Membranes are low-pressure driven element and available in a diverse range of forms and configurations, with membrane pore size or molecular weight (MW) separation being the primary characteristic of differentiation. What is MBR?MBR (Membrane Brio-Reactor) can be broadly defined as systems integrating biologicaldegradation of waste products with membrane filtration. ▪ They have proven effective in removing both organic and inorganic contaminants as well as biological entities from wastewater. ▪ MBR systems may be used with aerobic or anaerobic suspended growth bioreactors to separate treated wastewater from the biomass. ▪ Set up of MBR is mainly utilizing a bioreactor and membrane filtration as one unit process for wastewater treatment thereby replacing, and in some cases supplementing, the solids separation function of secondary clarification and effluent filtration, resulting the possibility to eliminate the secondary clarification and operate at higher MLSS concentration.Review of MBR - Hydro One 2www.hydro1.com.myFig. 1 – Flowchart of Membrane Bio-Reactor.Fig. 2 – Immersed Type & External Type Membrane Module for MBRMembrane used in MBR application can be type of immersed membrane module or external membranemodule. Immersed type membrane modules are immersed within the MBR tank and operate on suctionbasis, where effluent is sucked out from module outlet. External membrane modules operate onpressure basis, where untreated effluent is pressurized into inlet of external module from the MBR tank.(Refer Fig. 2)Advantages of the MBR: ▪ Better control of biological activity ▪ Effluent that is free of bacteria and pathogens ▪ Smaller plant size ▪ Biodegradation efficiency enhanced 10%~30% ▪ Short Hydraulic Residence Time (HRT) & Long Sludge Residence Time (SRT) ▪ Activated sludge increase by 2~3 times ▪ No secondary settling and disinfecting tank required ▪ Higher organic loading rates *(more advantages will be discussed in detail in the next sessions)Review of MBR - Hydro One 3www.hydro1.com.myNot only have there been numerous successful pilot scale studies, some full scale units are inuse in various parts of the world. Current applications include: ▪ industrial wastewater treatment ▪ municipal wastewater treatment and reuse ▪ water recycling in buildings ▪ landfill leach ate treatment How can MBR turn out to be your solution? ▪ The performance and efficiency of conventional biological reactor systems is limited by clarifier performance. (Refer Fig. 2) ▪ This is a function of operator skill, sludge settle-ability, basic clarifier design, solids management, and the extent and rate of variability in hydraulic or organic loading. ▪ When upsets occur, solids can be lost and plant performance compromised. In order to maintain adequate settling characteristics, suspended growth activated sludge plants are limited to mixed liquor suspended solids (MLSS) concentrations of less than 3,500 mg/L. Fig. 2 – Flowchart of Conventional Treatment System Vs. Membrane Bio-Reactor.Review of MBR - Hydro One 4www.hydro1.com.my ▪ With membrane separation, however, the normal clarification process is eliminated and replaced by a simple, reliable and positive barrier to all suspended solids and microorganisms. (Refer Fig. 2) ...