Particle size analysis in primary and secondary waste water effluents

Size distributions of particle mass, chemical oxygen demand (COD) and phosphorus at four municipal waste water treatment plants were investigated by fractionation of samples through 0.1-8.0 μm polycarbonate filters and 32-125 μm sieves, respectively. Particle size analysis of primary and secondary effluents at each plant showed significantly different size distribution functions. These distribution functions remained constant with respect to time under dry weather conditions so they can be considered as characteristic patterns for each sample location. Advanced treatment by deep bed filtration can be improved by taking into consideration the distribution pattern in the secondary effluents. In raw sewage and primary effluents 45-90% of COD and 35-80% of phosphorus were associated with suspended solids. In the secondary effluents particulate COD drops to 14-45% but particulate phosphorus increases to 55-80%. Conclusions are drawn for a better design of advanced contaminant reduction in connection with suspended solids removal processes.

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Particle Size Measurement in Waste Water Influent and Effluent Using Particle Size Analyzer and Quantitative Image Analysis Technique

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1133.571 ◽

2016 ◽

Vol 1133 ◽

pp. 571-575 ◽

Cited By ~ 2

Author(s):

Taslima Khanam ◽

Wan Nur Syuhada Wan Ata ◽

Ahmad Rashedi

Keyword(s):

Waste Water ◽

Particle Size ◽

Complex Structure ◽

Treatment Plant ◽

Domestic Wastewater ◽

Particle Size Analysis ◽

Size Analysis ◽

Efficient Operation ◽

Imaging Tool ◽

Particle Size Analyzer

Wastewater originated from domestic or industry use need to be treated before discharge it to the environment. Particle size is one of the parameter that determine efficient operation of wastewater treatment plant. The present work conducts a comparative study of non-imaging and imaging based particle size analysis tools to analyze the limitations and advantages of using such equipment. The study utilizes particle size analyzer (PSA) as non-imaging tool and light microscope as imaging tool to determine particle sizes in various waste water samples. For this analysis domestic wastewater influent and effluent are analyzed with both techniques. In addition, palm oil mill effluent (POME) has also been analyzed after Fenton process to compare the particle size using these tools. PSA shows most of the particles in the influent and effluent are in the size range of 100 to 700 μm, while microscopy shows additional information of aggregates structure in POME sample showing promising possibility of identifying complex structure of aggregates present in the sample.

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Particle size analysis in primary and secondary waste water effluents

Water Science & Technology ◽

10.2166/wst.1997.0108 ◽

1997 ◽

Vol 36 (4) ◽

pp. 151-158 ◽

Cited By ~ 15

Author(s):

U. Neis ◽

A. Tiehm

Keyword(s):

Waste Water ◽

Particle Size ◽

Size Distribution ◽

Laser Scanning ◽

Waste Water Treatment ◽

Particle Size Analysis ◽

Phosphorus Fractionation ◽

Particle Mass ◽

Size Analysis ◽

Secondary Effluents

Primary and secondary effluents of three waste water treatment works were analyzed for the size distribution of particle mass, chemical oxygen demand (COD), and phosphorus. Fractionation of suspended solids was done by 0.1-8.0μm polycarbonate filters and 32-125μm sieves, respectively. Primary as well as secondary effluents exhibited characteristic differences in the size distribution curves. Particle size distributions in terms of particle mass could be represented by a power law function. Automatic measurement of particle size distribution by a laser scanning device (CIS-100) was evaluated. Especially low concentrated waste water suspensions proved to be susceptible to aggregation during analysis. Therefore repeated short time analysis of subsamples is recommended.

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