Characteristics and domestication steps of activated sludge from small and medium-sized sewage treatment equipment in Shanghai
Shanghai small and medium sized sewage characteristics and domesticated step article of activated sludge treatment equipment: With environmental pollution, domestic and industrial wastewater treatment equipment is one of the essential equipment, especially acclimated activated sludge. With the help of environmental engineering and chemical engineering methods and methods, biological wastewater treatment has developed a variety of new methods for the control and treatment of water pollution with the action of microorganisms as the main body. Representative: Activated sludge method, biofilm method, anaerobic treatment method, biological nitrogen removal, phosphorus removal and other process technologies. The sludge concentration in the aeration tank is generally controlled at 2-3g/L, and the higher value is used when the wastewater concentration is high; the residence time (HRT) of the wastewater in the aeration tank is usually 4-8h, depending on the concentration of organic matter in the wastewater. ; The return sludge amount is about 25%-50% of the influent flow; 1. Confirm that the various indicators of the incoming water are within the allowable range through analysis, and prepare for the inflow. 2. Start to enter a small amount of production wastewater, and the amount of entry shall not exceed 20% of the pre-domestication treatment capacity. At the same time, add fresh water, fecal water and NH4Cl. 3. After achieving a better treatment, the dosage of production wastewater can be increased, and the increase is not more than 10-20% each time, and the dosage of NH4CL can be reduced at the same time. After the microorganisms are adapted and consolidated, the production of wastewater will continue to be increased until the NH4Cl addition is completely stopped. Simultaneously monitor the effluent CODcr concentration and other indicators, and observe the properties of the mixed liquid sludge. During the sludge acclimation period, the metabolites should be discharged in a timely manner, that is, the supernatant after the sludge is separated. 4. Continue to increase the dosage of production wastewater until full load. During the full-load operation stage, since sufficient quantities of activated sludge with high concentration and high activity have been cultivated and maintained in the tank, the MLSS of the mixed solution after aeration in the tank reaches 5000 mg/1. During this process, the dissolved oxygen is monitored simultaneously and the aeration is controlled. The operation of the machine and the biological microscopic inspection of the sludge. 5. There are bacteria, green algae and other algae, protozoa, and metazoans. Protozoa include sunworms, capillaries, and worms. Nematodes appear in metazoans. The large number of sessile ciliates in the mixed solution at the later stage of the commissioning operation, such as accumulators, indicates that the treatment system has good effluent quality. The above is the relevant content introduced to you by environmental protection, I hope it will be helpful to you. If you still have questions you don’t understand, you can call the environmental protection water treatment equipment company to answer them in detail.
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