A Study On The Treatment Of E Bleaching Effluent By Flocculation-Fenton Oxidation

E bleaching effluent contains a great deal of complicated lignin degradation products, which is difficult to remove by traditional chemicalbiological method. Fenton oxidation can remove refractory organics in effluent effectively. Their degradation property, solubility and flocculent settleability can be changed by oxidation. Flocculation is a typic method for water treatment, which has good adaptability and low investment. Using the two methods together can reduce pharmaceutical dosage and cost, enhance treatment efficiency.For the treatment of E bleaching effluent from a paper mill in Shandong, inorganic flocculent Al₂(SO₄)₃, organic flocculent CPAM and GCAM. Fenton oxidation are systematically studied in this paper. This paper also investigates reaction mechanism through FT1R spectrum and the change of phenols before and after treatment. As a result of study.it can be concluded:1, The best reaction condition of Al₂(SO₄)₃-GCAM for the E bleaching effluent treatment is: oxidation pH of 8.5, an Al₂(SO₄)₃ dosage of 1.2g/l, an GCAM dosage of 32mg/l. And Al₂(SO₄)₃ is used before GCAM in the process. Under the conditions, the removal rete of turbidity.CODcr,SS and chroma respectively is 97.64%,78.05%,96.78% and 92%.2,The analysis of FTIR specrum indicates: Al₂(SO₄)₃-GCAM flocculation can remove phenols and fatty ethers in E bleaching effluent, can degrade a part of AOX. Through Al₂(SO₄)₃-GCAM flocculation treatment, the concentration of phenols is reduced between 16.06%-99.92%. The removal rate of phenol and some other substances exceed 90%.3,Through orthogonal experiment, the best condition of Fenton oxidation is certain: an H₂O₂ dosage of 2g/l. an FeSO₄ dosage of 1.6g/l ,oxidation pH of 5, reaction time of 90min. The CODcr removal rete can reach 96.12%. The analysis of FTIR specrum indicates: Fenton oxidation can degrade lignin, polyxylose.cellulose and hemicellulose in the wastewater, also can remove AOX effectively. The removal rate of mostly phenols exceed 90%.4,Through orthogonal experiment, the best condition of Al₂(SO₄)₃-Fenton oxidation for the E bleaching effluent treatment is certain: an Al₂(SO₄)₃ dosage of 0.6g/l. oxidation pH of 5, an H₂O₂ dosage of 1.0g/l. an FeSO₄ dosage of 0.8g/l. The CODcr removal rete can reach 90.64%. The best condition of CPAM-Fenton oxidation for the E bleaching effluent treatment is certain: an CPAM dosage of 0.8mg/l, oxidation pH of 6. an H₂O₂ dosage of 1.5g/l. an FeSO₄ dosage of 1.2g/l. The CODcr removal rete can reach 82.43%.5,The adoption of Al₂(SO₄)₃-Fenton oxidation and CPAM-Fenton oxidation for E bleaching effluent treatment can remove more than 80% CODcr, degrade a part of lignin and chlorinated phenols by oxidation. Through the treatment, the difficulty of chemicalbiological treatment. AOX and toxicity of yielding water can be reduced, which is good for adaption of further strict effluent standard in the future.