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Open Access Cost Effective Conditioning & Dewatering Of Residuals From Lab to Full Scale

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Abstract:

Residuals generated from biological treatment of perchlorate contaminated groundwater at a treatment facility in Henderson, NV were conditioned with lime and ferric chloride prior to dewatering via standard plate and frame press. Options to enhance dewatering were investigated, including enzyme pre-treatment prior to inorganic conditioning, enzyme treatment prior to polymer conditioning, and polymer conditioning alone. Laboratory tests were conducted using a capillary suction time (CST) test and a bench scale pressure filter device. Results showed that enzyme pre-treatment was capable of enhancing residual dewaterability with either iron/lime or polymer conditioning. Polymer conditioning alone seemed to properly condition the sludge prior to dewatering, and at a low dose of 2-3 lb/DT solids. Economic evaluation showed that the increase in dewatering performance with enzyme pretreatment did not offset the cost of enzyme addition. Accordingly, polymer alone was tested at full-scale and results confirmed laboratory findings. The plant converted to polymer conditioning with satisfactory results.

Keywords: CONDITIONING; ENZYME PRE-TREATMENT; PRESSURE FILTRATION

Document Type: Research Article

DOI: https://doi.org/10.2175/193317707X195133

Publication date: 2007-04-01

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