ABSTRACT There were obvious differences between a medium gravel-less perforated pipe leach fields and a small system in the treatment of demestic sewage with the change of influent quality. In small system, COD removal rate was 91%, ammonia nitrogen removal rate was 90%, total nitrogen was 58%. In medium system, COD removal rate was 86.07%, ammonia nitrogen removal rate was 45.3%, and total nitrogen was 48.2%. This paper studied on the differences. Its main reasons were as follows: differences in opening rate (perforated area account of the total area in infiltration pipe), air flow conditions, exterior environment, and wastewater distribution. Considering those problems, Solutions and applications for the development of GPPLF are given.
Cite this paper
Yang, Y. , Wang, C. and Dang, Z. (2012) Comparing a small gravel-less perforated pipe leach fields (GPPLF) to a medium one in treating domestic sewage. Natural Science, 4, 192-197. doi: 10.4236/ns.2012.43029.
 Lance, J.C. and Gilbert, R.G. (1980) Renovation of waste-water by soil columns flooded with primary effluent. Water Pollution Control Federation, 52, 381-388.
 SFC. (2001) Gravelless and chamber systems alternative drain-field designs,” Pipeline, 12, 1-8.
 Cai, S.-T., Wang, C.-D., Xu, Q.-Y., Wang, X.-Y. and Li, C.-L. (2011) A study on gravel-less leach-fields with perforated pipe. Environmental Science & Technology, 34, 98-101.
 Gill, L.W., O’Luanaigh, N., Johnston, P.M., Misstea, B.D.R. and O’Suilleabhain, C. (2009) nutrient loading on sub-soils from on-site wastewater effluent comparing septic tank and secondary treatment systems. Water Research, 43, 2739-2749. doi:10.1016/j.watres.2009.03.024
 T. K. Stevik, G. Ausland, et al. (1999) “Removal of E. coli bacteria during intermittent filtration of wastewater effluent as affected by dosing rate and media type,” Water Resource, 33, 2088-2098.
 Knowles, P.R., Griffin, P. and Davies, P.A. (2010) Complementary methods to investigate the development of clogging within a horizontal sub-surface flow tertiary treatment wetland,” Water Research, 44, 320-330.
 Leverenz, H.L., Tchobanoglous, G., and Darby, J.L., (2009) Clogging in intermittently dosed sand filters used for wastewater treatment,” Water Research, 43, 695-705. doi:10.1016/j.watres.2008.10.054
 Kim, J.-W., Choi, H. and Pachepsky, Y.A. (2010) Biofilm morphology as related to the porous media clogging. Water Research, 44, 1193-1201.
 Kristiansen, R. (1981) Sand-filter trenches for purification of septic tank effluent: I. The clogging mechanism and soil physical environment. Journal of Environmental Quality, 10, 353-357.
 Kristiansen, R. (1981) “Sand-filter trenches for purification of septic tank effluent: Ⅱ. The fate of nitrogen. Jour- nal of Environmental Quality, 10, 353-357.
 Zhao, L.-f., Zhu, W. and Tong, W. (2009) Clogging processes caused by biofilm growth and organic particle accumulation in lab-scale vertical flow constructed wetlands,” Environmental Sciences, 21, 750-757.
 Kandelous, M.M. and Simunek, J. (2010) “Numerical simulations of water movement in a subsurface drip irrigation system under field and laboratory conditions using HYDRUS-2D. Agricultural Water Management, 97, 1070-1076. doi:10.1016/j.agwat.2010.02.012
 Garc, J., Chiva, J., Aguirre, P., Alvarez, E., Sierra, J.P. and Mujeriego, R. (2004) Hydraulic behavior of horizontal sub-surface flow constructed wetlands with different aspect ratio and granular medium size. Ecological Engineering, 23, 177-187. doi:10.1016/j.ecoleng.2004.09.002
 Giraldi, D., Vitturi, M. de M. and Iannelli, R. (2010) A dynamic numerical model of subsurface vertical flow constructed wetlands. Environmental Modeling & Software, 25, 633-640. doi:10.1016/j.envsoft.2009.05.007
 Van Cuyk, S., Siegrist, R., Logan, A., Masson, S. et al., (2001) Hydraulic and purification behaviors and their interaction during wastewater treatment in soil infiltration systems. Water Research, 35, pp. 953-964.