The lateral-flow sand-filter system for septic-tank effluent treatment

1994 ◽  
Vol 66 (7) ◽  
pp. 919-928 ◽  
Author(s):  
G. G. Check ◽  
D. H. Waller ◽  
S. A. Lee ◽  
D. A. Pask ◽  
J. D. Mooers
Keyword(s):  
Lateral Flow ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Sand Filter ◽  
Filter System ◽  
Septic Tank Effluent

Septic Tank Effluent Treatment Using Laboratory-Scale Peat Filters

1994 ◽  
Vol 29 (1) ◽  
pp. 19-38 ◽  
Author(s):  
R.N. Coleman ◽  
I.D. Gaudet
Keyword(s):  
Fecal Coliform ◽  
Loading Rate ◽  
Microbial Colonization ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Upward Flow ◽  
Septic Tank Effluent ◽  
Flow Treatment ◽  
Coarse Gravel ◽  
Bod Removal

Abstract Filter columns were designed, constructed from sand, peat and coarse gravel, and their effectiveness assessed in the treatment of septic tank effluent. An initial loading rate of 4 cm/d was applied to the filter columns in either a downward or upward flow at a temperature of 10°C or 20°C. The loading rate was later increased to 8 cm/d. Filter-column plugging occurred in the downward flow treatment but not in the upward flow treatment. Fecal Coliform removal was usually greater than 95%, BOD removal was greater than 75%, and various removal levels were exhibited for other components. Microbial colonization of peat and gravel was effective as revealed by scanning electron microscopy.

scholarly journals NEW APPROACH TO MODELLING SAND FILTER CLOGGING BY SEPTIC TANK EFFLUENT

2016 ◽  
Vol 17 (2) ◽  
pp. 97-107 ◽  
Author(s):  
Jakub Nieć ◽  
Marcin Spychała ◽  
Paweł Zawadzki
Keyword(s):  
Septic Tank ◽  
Sand Filter ◽  
New Approach ◽  
Septic Tank Effluent ◽  
Filter Clogging

Use of Peat in Septic Tank Effluent Treatment - Column Studies

1987 ◽  
Vol 22 (3) ◽  
pp. 491-504 ◽  
Author(s):  
Shahid Rana ◽  
T. Viraraghavan
Keyword(s):  
Phosphorus Removal ◽  
Fecal Coliform ◽  
Operating Conditions ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Column Studies ◽  
Dynamic Operating ◽  
Septic Tank Effluent

Abstract Studies were undertaken to examine the performance of peat filters under dynamic operating conditions. Five laboratory columns were used to determine the treatment capacity of peat at varying hydraulic and organic loadings. The columns with 200, 250, 300, 350 and 500 mm of peat compacted to a density of 100 kg/m3 were studied treating septic tank effluent. All the columns were dosed at uniform rates of 64 mm/d, 89 mm/d, 115 mm/d and 140 mm/d of septic tank effluent for periods of 14, 16, 10 and 4 weeks respectively. Results of column studies showed SS removal of 85-99%, BOD, COD removals in the 40 to 80% range, TKN removal of 0 to 90% and phosphorus removal of 0 to 25%. In general, excellent ( > 95%) fecal coliform reduction was obtained.

Effect of soil fortified by polyurethane foam on septic tank effluent treatment

2011 ◽  
Vol 63 (6) ◽  
pp. 1230-1235 ◽  
Author(s):  
J. Y. Nie ◽  
N. W. Zhu ◽  
K. M. Lin ◽  
F. Y. Song
Keyword(s):  
Hydraulic Conductivity ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Column Experiment ◽  
Effective Porosity ◽  
Effluent Treatment ◽  
Septic Tank ◽  
Natural Soil ◽  
Nitrogen And Phosphorus ◽  
Septic Tank Effluent

Fortified soil was made up of a mixture at a mass ratio 4/1000–6/1000 of sponge and natural soil according to the results of column experiment. The fortified soil had bigger porosity and higher hydraulic conductivity than the natural soil. The columns packed with 900 mm of the fortified soil endured a flow rate equivalent to 100 L/m2/d of septic tank effluent and the average chemical oxygen demand, nitrogen, and phosphorus removal rates were around 92%, 75% and 96%, respectively. After 100 weeks of operation, the saturated hydraulic conductivity of the fortified soil kept higher than 0.2 m/d. The bigger porosity of sponge improved the effective porosity, and the bigger specific surface area of sponge acted as an ideal support for biomat growth and ensured the sewage treatment performance of the fortified soil. The comparable performance was due to a similar and sufficient degree of soil clogging genesis coupled with bioprocesses that effectively purified the septic tank effluent given the adequate retention times.

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