Delayed aeration activated sludge system (fully oxidized activated sludge method) 1 process: With the traditional activated sludge method 2 process characteristics: ①sludge load rate is very low BoD5 Ns = 0.05-0.1Kg BoD5 / Kgmlssd ② aeration time is long 24-48h ③ The remaining sludge less, do not need anaerobic digestion ④ completely mixed aeration tank Oxidation ditch process is a special type of aeration process - circulating mixed aeration tank 3 process parameters T = 24-48h R = 60% -200% Ns = 0.05-0.1 Qc = 20-30d X = 3000-6000mg / L 4 shortcomings Advantages (water quality, water impact load adaptability) No primary lake Disadvantages ①large capacity Yong ② burst a long time ③ infrastructure and operating costs ICEAS (Intermittent Cyclic Extended AeratlonSystem) process known as the intermittent cycle delay aeration activated sludge process. It rose in Australia in the early 1980s and is a distorted SBR process. Compared with the traditional SBR, ICEAS is characterized by the following features: a pre-reaction zone is added to the water inlet end of the reactor, and the operation mode is continuous water infiltration (water remains in the sedimentation period and the drainage period), intermittent drainage is not obvious The reaction stage and the idle stage. This system is cheaper and less expensive to manage than municipal and industrial waste water and is easier to manage. However, as the influent water runs through each stage of the whole operation cycle, the influent water is limited due to the water turbulence in the bottom of the main reaction zone, which affects the muddy water separation time. Hydraulic retention time is usually longer. Intermittent drainage delay aeration process (IDEA) has basically maintained the advantages of CAST Arts, the operation mode of continuous water, intermittent aeration, periodic drainage form. Compared with CAST, the pre-reaction zone (bio-selector) was changed to a premixing tank separate from the SBR main structure. Part of the remaining sludge was returned to the premixing tank and water was fed to the middle of the reactor. Pre-mixed pool set up to make the sewage under high floc load have a longer residence time to ensure high flocculation bacteria choice. Delay aeration activated sludge method: ①due to low load, delay aeration tank volume, covers an area of ​​?? large changes in the water quality and quantity ③ less sludge production ④ good treatment effect Delayed aeration activated sludge method for the removal of BOD higher than the traditional activated sludge method. Activated sludge in delayed aeration activated sludge has been in the endogenous respiration period. Powerful Double-Toothed Roll Crusher
The graded toothed roller crusher is powered by two electric motors,
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