Basim Yalda, Farzadkia Mahdi, Jaafarzadeh Nematollah, Hendrickx Tim
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
Iranian J Environ Health Sci Eng. 2012 Aug 2;9(1):4. doi: 10.1186/1735-2746-9-4.
Sludge production is an avoidable problem arising from the treatment of wastewater. The sludge remained after municipal wastewater treatment contains considerable amounts of various contaminants and if is not properly handled and disposed, it may produce extensive health hazards. Application of aquatic worm is an approach to decrease the amount of biological waste sludge produced in wastewater treatment plants. In the present research reduction of the amount of waste sludge from Ahvaz wastewater treatment plant was studied with the aquatic worm Lumbriculus variegatus in a reactor concept. The sludge reduction in the reactor with worm was compared to sludge reduction in a blank reactor (without worm). The effects of changes in dissolved oxygen (DO) concentration up to 3 mg/L (run 1) and up to 6 mg/L (run 2) were studied in the worm and blank reactors. No meaningful relationship was found between DO concentration and the rate of total suspended solids reduction. The average sludge reductions were obtained as 32% (run 1) and 33% (run 2) in worm reactor and 16% (run 1) and 12% (run 2) in the blank reactor. These results showed that the worm reactors may reduce the waste sludge between 2 and 2.75 times higher than in the blank conditions. The obtained results showed that the worm reactor has a high potential for use in large-scale sludge processing.
污泥产生是废水处理过程中一个可避免的问题。城市污水处理后残留的污泥含有大量各种污染物，如果处理和处置不当，可能会产生广泛的健康危害。应用水生蠕虫是减少污水处理厂产生的生物废污泥量的一种方法。在本研究中，采用反应器概念，研究了用颤蚓（Lumbriculus variegatus）减少阿瓦士污水处理厂废污泥量的情况。将有蠕虫的反应器中的污泥减量与空白反应器（无蠕虫）中的污泥减量进行了比较。研究了在蠕虫反应器和空白反应器中，溶解氧（DO）浓度变化至3mg/L（实验1）和6mg/L（实验2）时的影响。未发现溶解氧浓度与总悬浮固体减少率之间存在有意义的关系。在蠕虫反应器中，实验1和实验2的平均污泥减量分别为32%和33%，在空白反应器中分别为16%和12%。这些结果表明，蠕虫反应器减少的废污泥量可能比空白条件下高2至2.75倍。所得结果表明，蠕虫反应器在大规模污泥处理中具有很高的应用潜力。
