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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

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文章编号:1672-7207(2010)06-2072-07
生物制剂配合-水解法直接深度处理含锰废水
裴斐,王云燕,柴立元,舒余德

(中南大学 冶金科学与工程学院,湖南 长沙,410083)

摘 要: 在含锰废水特性分析的基础上,开发生物制剂配合-水解法直接深度处理含锰废水新技术。含锰废水生物制剂配合体系中存在pH为8.80~11.18和12.28~13.08的2个缓冲区。废水pH从2.04升高至10.00,氢氧化钠的加入量为2.67~4.00 g/L。研究得到优化工艺条件:生物制剂加入量(即控制生物制剂与废水中锰的质量比)为0.2,配合时间为5 min,水解时间为5 min,温度为25 ℃,pH为10.0,聚丙烯酰胺(PAM)加入量为2.0 mg/L,可将废水中锰离子质量浓度从994 mg/L去除到0.127 mg/L,远低于《污水综合排放标准》(GB 8978—1996)的限值2.000 mg/L;含锰沉渣呈无定型及棒状,主要物相为CaSO4,渣中锰含量达14.16%,可返回生产系统回收锰;生物制剂通过其中的—OH,—COOH,—NH,—C=O,—SO3,—C—O(H)和C—Cl等基团与废水中的含锰离子配合,在水解过程中形成难溶物质沉淀分离。

 

关键字: 生物制剂;锰;废水;沉渣;配合-水解

Direct and deep treatment of manganese-containing wastewater by biologics complexing-hydrolyzation
PEI Fei, WANG Yun-yan, CHAI Li-yuan, SHU Yu-de

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:A novel technology for direct and deep treatment of manganese-containing wastewater by biologics was put forward based on the property analysis of manganese-containing wastewater. There are two pH buffer zones which are from 8.80 to 11.18 and from 12.28 to 13.08 in the complex system of manganese-containing wastewater and biologics. Theoretically, the required amount of sodium hydroxide for increasing pH from 2.04 to 10.00 is 2.67-4.00 g/L. The optimum condition are as follows: the mass ratio of biologics to manganese is 0.2, the cooperation time is 5 min, the hydrolysis time is 5 min, the temperature is 25 ℃, pH is 10.0, polyacrylamide (PAM) is 2 mg/L. Under the above optimum conditions, manganese concentration decreases from 994 to 0.127 mg/L in laboratory scale experiment, which is much less than integrated wastewater discharge standard (GB 8978—1996) (2.000 mg/L). The surface morphology of manganese-containing sludge is amorphous and rod and the main phase is CaSO4. The proportion of manganese in the sludge reaches 14.16%, indicating that the sludge can be reused for manganese recovery. In the hydrolyzation process, manganese ions combine with the functional groups including —OH, —COOH, —NH, —C=O, —SO3, —CO(H) and C—Cl in biologics, to form precipitation.

 

Key words: biologics; manganese; wastewater; sludge; complexing-hydrolyzation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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