Flocculants Being Applied In The Wastewater Of Cotton-Fiber Printing And Dyeing Products

The printing and dyeing wastewater, which produced in the production of printing and dyeing factories is the main pollution source of textile industry. If the wastewater weren' t treated before being discharged, this would affect the ground water seriously. Thus may destroy the ecology balance of water and make water septic. The composition of this style wastewater is considerable complex. It contains many kinds of organic dyestuff. It has complex characteristic, such as strong toxicity, deep tone, the wide fluctuations, difficult biodegradable, the wide variation of composition, a large quantity of water and density. At present, because of the using of PAV and new aid drug in printing and dyeing industry, the quantity of the different biodegradable organic materials has increased. We also find the B0D5 / COD is very low, the intermittent operation lead to the fluctuation of the water quantity and quality. So printing and dyeing wastewater is the difficulty of industry wastewater treatment. Understanding and developing effective technology of printing and dyeing industry wastewater treatment is the important task of environmental protection industry.In this dissertation, the main purpose of my task is discussing the reduction effect of COD and the reduction effect of tone in textile and printing and dyeing wastewater treatment through coagulants being applied in the wastewater of cotton-printing and dyeing products. We also study the best quantity of coagulants reacting time, temperature and PH and so on in practice application. The style of dyestuff, the variation of water quantity and other factors affecting extent of the flocculation result should be studied. The meaning is gaining the relationship of evaluate the merit and defect of PAC, PAFC, Inorganic-organic coagulant through combing result. This can provide definite theory base and practiceexperience in the real application of PAFC in textile and printing and dyeing wastewater treatment.The key problem of thesis design is to find the kind and character of dyestuff, which has the biggest influence to waste water tone. The second is to study the effect of the reduction of COD, and the effect of the reduction of tone. The third is to compare it with common flocculant to find the difference of its treatment efficient, using range. The contain of the three above is the difficult technique. If this problem is solved successfully, this will provide textile and printing and dyeing wastewater treatment a treatment method, which is cheap, better treatment effect and may be applied in vast areas. It also can provide the possibility of complex flocculant's large scale applied in industry production.This design has the serious spirits and penetrates the practice. Our task is to find the advantages of PAFC comparing with other flocculant through comparative experiment. Then we can find the best reacting time, PH and best dosage in real application. We can do economical, technical evaluation to PAFC, which is applied in printing and dyeing wastewater. Fathomer, we must pose the modified opinion to defect and provide the theatrical and practical reference to PAFC applied in printing and dyeing wastewater.