改性木质素除油絮凝剂处理含油废水的研究

利用制浆造纸工业中的副产物——碱木素为原料,通过化学改性,制备出含二硫代氨基甲酸盐基团的改性木质素除油絮凝剂(MLOF),利用MLOF处理含油废水,并进行絮凝条件的优选实验。实验结果表明,当含油废水的pH值为6.7,絮凝剂的质量浓度为35 mg/L时,废水中的油、CODCr、固体悬浮物(SS)和色度的去除率分别达到88.2%,71.5%,90.5%和93.7%。不同类型絮凝剂的对比实验结果表明,MLOF处理含油废水的用量少,且其絮凝性能明显优于聚丙烯酰胺(PAM)、聚合氯化铝(PAC)和聚合硫酸铁(PFS)等高分子絮凝剂。

The Treatment of Oily Wastewater With a Modified Lignin-Based Oil Removal Flocculant

The modified lignin-based oil removal flocculant containing the dithiocarbamate group,denoted as MLOF,was prepared by chemical modification of alkali lignin,a byproduct from the pulp and paper industry.Then MLOF was adopted to treat the oily wastewater.And the flocculation conditions were optimized.The results show the removal percentages of oil,CODCr,suspended solid(SS) and colourity of the effluent can reach to 88.2%,71.5%,90.5% and 93.7% respectively under such conditions as 6.7 of the effluent pH value and 35 mg/L of the flocculant dosage etc.Moreover,the comparison tests with various flocculants indicated that the amount of MLOF was little when treated oily wastewater and the flocculation performance of the modified lignin-based oil removal flocculant apparently prevailed over such high-molecular flocculants as polyacrylamide(PAM),polyaluminium chloride(PAC) and polyferric sulfate(PFS) etc.