Activated sludge method is one of the most widely used and mature technology of wastewater aerobic biological treatment technology, and now many urban secondary sewage treatment plants are used to deal with urban wastewater. The traditional activated sludge process consists of aeration tank, secondary sedimentation tank, aeration system and sludge return system. Activated sludge method is one of the most widely used and mature technology of wastewater aerobic biological treatment technology, and now many urban secondary sewage treatment plants are used to deal with urban wastewater. The traditional activated sludge process consists of aeration tank, secondary sedimentation tank, aeration system and sludge return system. First, the reaction mechanism of activated sludge from the anaerobic tank effluent and return to the activated sludge into the aeration tank at the same time, through aeration, activated sludge was suspended and fully contact with the wastewater. The suspended solids and gelatinous substances in the wastewater are adsorbed by the activated sludge, and the non-dissolved organic matter needs to be first converted into soluble organic matter before being metabolized and utilized; while the soluble organic matter in the wastewater is used by the microorganisms in the activated sludge as Its own reproductive nutrition, metabolism into biological cells, most of the organic matter is oxidized into the final product (mainly CO2 and H2O), the wastewater was purified. In the secondary sedimentation tank, the activated sludge is separated from the purified wastewater, the treated water is discharged, the activated sludge is concentrated in the sludge zone, and the aeration tank is refluxed at a higher concentration. The oxygen required for microorganisms in activated sludge is often supplied by aeration. The basic conditions for the effective operation of activated sludge treatment system: 1, the wastewater contains enough soluble organic matter easily degradable, as nutrients necessary for physiological activities of microorganisms; 2, adequate dissolved oxygen; 3, activated sludge can fully contact with the wastewater; 4, aeration tank to maintain a certain concentration of sludge; 5, prohibit the entry of toxic substances to microorganisms. Second, the project features Our company in many years of engineering design and actual operation, developed for the treatment of printing and dyeing wastewater activated sludge treatment technology. The activated sludge process designed by our company has the following characteristics: 1. The operating mode of the activated sludge system with push-flow activated sludge with high processing efficiency is push-flow type, completely mixed type, segmented aeration method, adsorption - Regeneration, delayed aeration and other modes of operation. In the push-flow operation mode, the concentrations and types of organic substances change along the process, and the sludge load and the oxygen consumption rate are high and low afterwards. Each section has a larger concentration gradient, so the degradation rate is faster, flexible operation, suitable for processing higher water quality and more stable wastewater. At the same time you can view more technical documents of China Sewage Treatment Engineering Network. After many years of research and comparison, for the printing and dyeing wastewater concentration, high chroma, higher processing requirements, the use of push-flow mode of operation; in order to avoid short-run phenomenon occurred in the operation of the pool, aeration methods have been made Well-designed, in operation, muddy water mixing effect is good, within certain time and space gradient, microorganisms fully decompose organic matter under aerobic conditions, the treated effluent is better. 2, the aeration system aeration aeration aeration aeration aeration, there are two kinds of push-flow and push flow. The purpose of aeration is to supply the amount of oxygen necessary for the new generation of microorganisms, and the second is to fully mix the sludge and the wastewater to achieve the purpose of stirring. When the rotary push flow aeration, if the fan pressure is not enough, then reach the purpose of aeration, and the pool is prone to dead ends; when to meet the requirements of aeration, the fan air volume, wind pressure should be increased, Then the power costs increase. After comparison, the company designed the use of flat flow aeration, can reach the aeration requirements. (2) aeration control Aiming at the shortcomings of the traditional flow-through type, such as insufficient aeration on the first pond and over-supply on the pond tail, based on years of operational experience and based on the relationship between wastewater concentration and dissolved oxygen in the pond, Gas way, that is, from the first pond to pool tail aeration gradually reduced, so that both to achieve the purpose of efficient purification, while saving on power costs. To control the size of the aeration, the design uses a self-control system, automatically adjust aeration intensity according to the change of dissolved oxygen in the pool, and improve the degree of system automation. ⑶ aeration aeration tank contains enough dissolved oxygen, is the basic conditions for the effective operation of activated sludge. The aeration device in the traditional flat push-flow aeration method is mainly to aerate the aeration disk at the bottom of the aeration tank. The disadvantages are the utilization rate of oxygen, low oxygenation capacity, inconvenient maintenance and replacement, and great power consumption. After a long period of operation, our company chose a variable microporous aerator jointly developed by our company and its units, all of which are better than traditional aerators. For the characteristics of printing and dyeing wastewater, in order to make aeration in the pool to form a certain gradient, taking into account the convenience of maintenance, maintenance, our company developed a suitable floating activated sludge aeration device. Pool installation of multiple groups of aeration device, each group has a plurality of variable micropore aerator, aerator and air manifold connected, maintenance, just to be overhaul the group of aeration device from the air supervisor off , From the water can be carried out overhaul, replacement, without emptying the pool of sewage. Due to the variable pore aerator arranged in the bottom of the pool, the activated sludge has a certain degree of agitation to make the mud and water fully contact. 3, Efficient secondary sedimentation tank The secondary sedimentation tank is the role of mud water separation, concentration and return of activated sludge, relates to the effluent quality and concentration of reflux sludge. For the characteristics of printing and dyeing wastewater, I designed the secondary sedimentation tank pool mainly radial sedimentation tanks, sedimentation tanks and other advection. 4, adequate sludge return, the amount of nutrients added Activated sludge treatment is good or bad and the concentration of activated sludge is closely related to the activity of microorganisms in the activated sludge metabolism, if you do not add activated sludge, activated sludge The number of microorganisms, activity will be greatly reduced, the treatment effect is getting worse. In order to make the treatment system has a high activity, enough activated sludge is returned during operation. Dyeing wastewater is different from domestic sewage, wastewater BOD / COD ratio is not high, biodegradability is poor, if not add the right amount of nutrients, even if the sludge is not the effect of return treatment is not good, the effluent can not meet the emission requirements. According to the characteristics of wastewater, taking all factors into consideration, a certain amount of nutrients (nitrogen fertilizer, phosphate fertilizer, domestic sewage, etc.) can be added to the pond according to the specific conditions of influent and the growth of microorganisms during operation, Biodegradability, the maximum degree of decomposition of organic matter, to purify the purpose. (Activated Sludge Process in Printing and Dyeing Wastewater Treatment)
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Product Introduction:
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