Research On Treatment Of Ink Wastewater By Coagulation－biotrickling Filter

In order to effectively control this kind of pollution, ink wastewater from Guilin Stationery Factory is treatment by Coagulation-Biotrickling Filter. Through the research of pollution removal efficiency and process promotion, it is found that economic process and operating conditions, which provide a theoretical basis and reference for the ink wastewater and similar dye wastewater practical operation in energy-saving and high efficiency way. The main research content and results are as follow:1.Pretreatment process of coagulation was studied. The removal effect was studied, and then the best coagulant for treatment of ink wastewater and the best process parameters was determined. The result shows that the best process parameters:the fast mixing time is 90 s, and then slow mixing time is 20 min, coagulation time is 30 min. The COD concentration is reduced from 10200 mg/ L to 3280 mg/ L, chroma is reduced from 32000 times to 4000 times, SS is reduced from 4336 mg/ L to 3164 mg/ L by 2.5 g/ L Polymerization Ferric Sulfate (PFS).2.The start-up process of the biotrickling filter was studied. The biofilm was formed by natural. Ink wastewater was added to COD about 400 mg/L. Ink wastewater after coagulating and simulated sewage wastewater were mixed with 1:10 volume ratio. The domesticate biofilm to acclimation from green to black, the kinds of the microbes was decrease. The removal of the average COD was 75.64 % and the color removal efficiency is 75 %, the biofilm had a good effect on waste water which mixed with 1:10 volume ratio.3.The operation and optimization process of biotrickling filter system were studied. The removal effect of ink wastewater by hydraulic loading rate, dissolved oxygen, organic loading rate and the reflux ratio was studied, and then found out the best operating conditions. The result shows that: the greater the hydraulic loading rate, the better the removal efficiency; dissolved oxygen had little effect on the removal efficiency; the higher organic loading rate, the worse removal efficiency; the greater reflux ratio, the better removal efficiency. The best operating conditions are: hydraulic loading rate is 1.59m3/m2 ? h, the flow rate of 50 L/h, dissolved oxygen is 4±0.2 mg / L.4.The biotrickling filter model was studied. The result shows that: according to the formula of Eckenfelder, a model of fitting a biotrickling filter based on guidance technology for a living from the proposed to the relevant parameters of is derived. The biotrickling filter model isρρ0? = exp(– 0. L606 .681636H ) , the simulation results are validated under different reflux ratios. The biotrickling filter model could simulation the effect of biotrickling filter performance, and the application of the model of practical engineering design was discussed.5.Isolation and purification of microorganisms were studied. The result shows that:according to research of the training of a pure and in the shape of a microscope, after isolation and purification of microorganisms, three kinds of bacteria was isolated. Isolation and purification of microorganisms were studied by flask-shaking test. The three kinds of bacteria which isolated from the ink wastewater mixed with simulation domestic sewage waste water were with the degradation and removal effect. The best degradability is number 2 bacteria, the removal of CODCr was 68.37%, and the removal of chroma was 66.67%.