PATHOGEN DESTRUCTION IN SEWAGE SLUDGE BY COMPOSTING AND CEMENT KILN DUST BLENDING | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 4, Volume 28, Issue 10, October 2003, Page 7467-7480 PDF (3.13 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.245312 | ||||
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| Author | ||||
| A. Zayed, | ||||
| Soil & Water Department, Faculty of Agriculture, Suez Canal University | ||||
| Abstract | ||||
| An experiment for pathogen removal from a raw sewage sludge (55) by composting and addition of cement kiln dust (CKD) was carried out at the Experimental Farm of the Faculty of Agriculture, Suez Canal University, Ismailia Governorate. 55 from the Wastewater Treatment Plant at 5 erabium, I smailia, was mixed with ground rice straw (RS) on equal weight basis. The mixture of SS and RS was composted individually or blended with CKD, on weight basis as follows: SS-RS mixture, SS-RS mixture+5%CKD, SS-RS mixture+10%CKD, SS-RS mixture+15%CKD and SS-RS mixture+20%CKD. Different compost mixtures were regularly mixed in elongate piles 5 m long and 1 m high and wide. Temperature and pH values were recorded, total coliforms, Salmonella spp < /em>., Shigella spp < /em>., Klebsiella spp < /em>., Vibrio spp. and Ascaris humbericoides ova counts were counted at various composting stages (0, 1, 2, 3, 5, 7, 15, 3D, 45 and 60 days). Data for all composting treatments indicated that: Temperature was gradually increased by increasing composting period and application rate of cement kiln dust till the 5 Ih or 7 Ih day and then again declined till so" day (the end of the experiment).The pH decreased as composting progressed till the end 0 f c om posting and increased by increasing application rate of cement kiln dust at all composting stages. Total coliforms, Salmonella spp < /em>., Shigella spp < /em>., Klebsiella spp., Vibrio spp < /em>., and Ascaris humbericoides ova counts decreased as composting progressed till the end of composting. Pathogenic bacteria and Ascaris parasite ova counts of mixtures decreased and the reduction percentages increased by increasing application rate of cement kiln dust. Ascaris parasites were more resistant tot he c omposting and CKD blending than other pathogens. Also, total coliforms and Salmonella sp < /em>p < /em>. were less resistant to destroy by compo sting and CKD blending than other pathogenic bacteria. | ||||
| Keywords | ||||
| sewage sludge; cement kiln dust; rice straw; composting; pathogens; parasites; temperature; pH; recycling | ||||
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