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	[quote=allen] The unified aerobic and anaerobic [url=https://www.khnwatertreatment.com/sludge-dewatering/belt-press/belt-filter-press-for-dewatering-wastewater.html]Belt Filter Press[/url] biological treatment method can no longer meet the needs of the printing and dyeing industry, and then produces anaerobic-aerobic combination biological treatment technology, making full use of the advantages of anaerobic and aerobic biological treatment technology, and the anaerobic section in the anaerobic-aerobic system has a dual role: First, pretreatment of wastewater, improve its biochemical performance, adsorption and degradation of part of the organic matter. The second is to digest the remaining sludge of the system. Aerobic method of biological method: 1. The activated sludge method has the advantages of relatively low investment and better treatment effect. The technology mixes wastewater with activated sludge (microorganisms) and aerates it to decompose the organic pollutants in the printing and dyeing wastewater, and the biosolids are then separated from the treated wastewater and partially returned to the aeration tank as needed. Activated sludge can not only decompose a large amount of organic matter, but also remove part of the color, but also fine-tune the pH value, high operating efficiency and low cost, good effluent quality, suitable for the treatment [url=https://www.khnwatertreatment.com/sludge-dewatering/multi-disc-screw-press/stainless-multi-disc-screw-press-for-sludge.html]multi disc screw press[/url] of printing and dyeing wastewater with higher organic content. 2. SBR method sequence batch activated sludge method (SBR) is a kind of activated sludge wastewater treatment technology that operates according to intermittent aeration mode. This technology has the advantages of temporal flow pushing and spatial complete mixing, making it a potential process for the treatment of refractory organic matter*. Peng Ruomeng and others use SBR process to treat printing and dyeing wastewater, and the COD removal rate is 50% to 90% in the case of inlet water COD of 800mg/L and pH of about 8.0. 3. The biofilm method is a method of treating wastewater by growing biofilms on the surface of fillers such as filter materials, disc surfaces, etc., and the decolorization effect of the printing and dyeing wastewater is higher than that of the activated sludge method. The biofilm method has more forms in the treatment of printing and dyeing wastewater, mainly including contact oxidation method and biological filter. Due to the high concentration and refractory degradation characteristics of printing and dyeing wastewater, it is difficult for the simple biofilm method to achieve satisfactory treatment results in the treatment of printing and dyeing wastewater. 4. The biological contact oxidation method is derived from the biofilm method, which has the advantages of both activated sludge and biofilm. Wastewater and biofilm contact, biofilm by the bacteriomeric group, filamentous bacteria, fungi, protozoa and epizoans composed, under aerobic conditions, biofilm adsorption of organic matter in wastewater, organic matter is oxidized by microorganisms decomposition, can make the wastewater purified, because it has a small volume load, occupies less land, less sludge, does not produce filamentous bacteria expansion, no need for sludge reflux, easy management, degradable special organic matter of the characteristics of the obligative microorganisms, in recent years in the printing and dyeing industrial wastewater widely used. 5. MBR, also known as membrane bioreactor, is a new type of water treatment technology combined with activated sludge method and membrane separation technology. There are many types of membranes, classified according to the separation mechanism, there are reaction membranes, ion exchange membranes, osmotic membranes, etc.; Classified according to the nature of the membrane, there are natural membranes (biofilms) and synthetic membranes (organic and inorganic membranes); According to the structural type of the membrane, there are flat plate type, tube type, spiral type and hollow fiber type. In the MBR process, the membrane separation component can improve the concentration activity of certain obligate bacteria, and can also intercept macromolecular refractory substances; It is also possible to recycle chemical [url=https://www.khnwatertreatment.com/wall-penstocks/]Wall Penstocks[/url] raw materials while treating wastewater; Some of the water removed after treatment can meet the standard of recycled water. When the anaerobic-aerobic (A/O) MBR of the same design treated the printing and dyeing wastewater, it was found that the residence time was short and had a greater impact on the removal rate. The residence time is long, and the removal rate is relatively high, but it should not be too long, otherwise it will cause a decrease in sludge concentration (MLSS). [/quote]
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