段志广







摘 要:活性污泥的丝状菌性膨胀,是活性污泥污水处理过程中遇到的最棘手问题,将导致污泥沉降性能变差,废水处理效果降低。本文研究了引起污泥膨胀的诱因微生物及其生长特性,并采取一定措施来控制污泥的膨胀现象。研究发现,添加抑制剂和改变进水的C/N比例及污泥有机负荷,均能有效地控制污泥的膨胀现象,其中,次氯酸钠的用量为15 ppm,C/N比例为25:1,污泥负荷为0.6 kgBOD5/(kgMISS.d)。
关键词:污泥膨胀;丝状菌;抑制剂;C/N比例;有机负荷
中图分类号:X703 文献标识码:A 文章编号:1003-5168(2021)30-0090-04
Abstract: Filamentous bulking of activated sludge is the most difficult problem encountered in the process of activated sludge wastewater treatment, which will lead to poor sludge sedimentation performance and reduced wastewater treatment effect. In this paper, the inducement microorganisms causing sludge bulking and their growth characteristics were studied, and some measures were taken to control sludge bulking. It was found that adding inhibitors and changing the C/N ratio of influent and sludge organic load can effectively control the sludge bulking phenomenon, in which the dosage of sodium hypochlorite is 15 ppm, the C / N ratio is 25:1, and the sludge load is 0.6 kgBOD5 / (kgMISS. d).
Keywords: sludge bulking; filamentous bacteria; inhibitors; C/N ratio; organic load
活性污泥膨脹主要分为两种:一种是由污泥中丝状菌大量繁殖造成的丝状菌膨胀;另一种是由污泥中微生物代谢产物粘在一起形成的黏性菌胶团膨胀。在污水处理中更常见的是由丝状菌大量繁殖引起的污泥膨胀,90%的污泥膨胀是由活性污泥中丝状菌的过量生长而引起的。污泥膨胀使污泥的沉降性能变差,影响整个出水水质处理工艺,增加污泥的处理难度和处置费用,使整个处理过程难以控制。而且是活性污泥法污水处理厂运行过程中经常遇到的最棘手的问题之一[1,2]。1993年,欧盟联合组织攻关活性污泥膨胀问题,但始终没有获得彻底有效地解决方法[3,4]。目前,有关污泥丝状菌膨胀的成因、机理及其控制途径的研究很多[5-7],并且已经发现造成污泥膨胀的诱因微生物多达30多种[8],但对于造成维生素废水丝状菌污泥膨胀的诱因微生物及其膨胀控制办法,目前国内外相关研究较少。……