Baawain Mahad S, Al-Jabri Mohsin, Choudri B S
Center for Environmental Studies and Research (CESAR), Sultan Qaboos University, Muscat, Sultanate of Oman.
Sohar Industrial Port Company, Sohar, Sultanate of Oman.
Iran J Public Health. 2015 Nov;44(11):1473-81.
Domestic and industrial wastewaters are mostly treated by biological process such as activated sludge, aerobic pond, and anaerobic treatment. This study focuses on characterizing the quality of sewage sludge in the Sultanate of Oman chosen from three industrial sewage treatment plants (STPs): Rusayl Industrial Estate (RSL.IE); Sohar Industrial Estate (SIE); and Raysut Industrial Estate (RIE).
Samples of recycled activated sludge (RAS) and wasted activated sludge (WAS) were collected over a period of 12 months across above mentioned STPs. Parameters analyzed are electrical conductivity (EC), potential of hydrogen (pH), cations, anions and volatile content (VC).
The obtained values for pH and EC were low for both RAS and WAS samples, except EC values of RIE that was more than 1000 μS/cm. The range of VC percentages in RAS and WAS samples were 44 to 86% and 41 to 77%, respectively. The measured values for chloride, sulfate, nitrate and phosphate were higher than the other anions.
The average values of the cations in RAS and WAS samples were within the Omani Standards, suitable for the re-use of sludge in agriculture except for Cd in RSL.IE. The study recommends that a regular maintenance should be performed at the studied STPs to prevent any accumulation of some harmful substances, which may affect the sludge quality, and the sludge drying beds should be large enough to handle the produced sludge for better management.
生活污水和工业废水大多通过生物处理工艺进行处理，如活性污泥法、好氧塘和厌氧处理。本研究重点对阿曼苏丹国从三个工业污水处理厂（STP）采集的污水污泥质量进行表征，这三个污水处理厂分别是：鲁赛勒工业区（RSL.IE）；苏哈尔工业区（SIE）；以及赖苏特工业区（RIE）。
在12个月的时间里，从上述污水处理厂采集了循环活性污泥（RAS）和废弃活性污泥（WAS）样本。分析的参数包括电导率（EC）、氢离子电位（pH）、阳离子、阴离子和挥发性成分（VC）。
除了RIE的EC值超过1000μS/cm外，RAS和WAS样本的pH值和EC值都较低。RAS和WAS样本中VC百分比的范围分别为44%至86%和41%至77%。测得的氯化物、硫酸盐、硝酸盐和磷酸盐的值高于其他阴离子。
RAS和WAS样本中阳离子的平均值在阿曼标准范围内，除了RSL.IE中的镉外，适合在农业中再利用污泥。该研究建议，应对所研究的污水处理厂进行定期维护，以防止可能影响污泥质量的一些有害物质的积累，并且污泥干燥床应足够大，以处理产生的污泥，以便更好地管理。
