Research on Water-Based Ink Wastewater Treatment Based on "Coagulation Decolorization-Biodegradation" Combined Process
[Purposes]Due to the high chroma,high chemical oxygen demand and difficult biodegradation of water-based ink wastewater,its decolorization and biological treatment process need to be further studied.In this paper,pH:6.5-7.5,COD:1 609 mg/L),using ferrous sulphate,chitosan as a coagulant and coagulant aid,was done to address the issue of the solution"yellowing"after using a traditional iron salt coagulant.[Methods]The experimental system was optimized with 7 mL/L of sodium hypochlorite solu-tion,under the condition of 1 000 mg/L of coagulant,0.7 mg/L of coagulant aid,a pH of about 8.0,and an 8.5-minute total reaction time,and the content of available chlorine(Cl)is 6%.[Findings]The decol-orization rate of the ink wastewater can reach 98%,and the coagulant dosage can be reduced to 500 mg/L under the premise of guaranteeing the decolorization effect by using the optimised method,which can effec-tively solve the problem of"yellowing".[Conclusions]The COD(about 725 mg/L),which cannot be removed after decolorization,can be reduced to 103 mg/L by"hydrolysis acidification+aerobic"biological treatment,which is in line with the discharge standard of the enterprise's discharge permit,and the idea of solving the common"yellowing"problem of iron salt coagulant was successfully put forward,which is economical,reliable and has certain practical application value.
water-based ink wastewatercoagulationdecolorizationbiodegradationcombined process
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