Long- term Irrigation with Dairy Factory Wastewater Influences Soil Quality

Authors: Yen-Yiu Liu, Richard J. Haynes

Abstract:

The effects of irrigation with dairy factory wastewater on soil properties were investigated at two sites that had received irrigation for > 60 years. Two adjoining paired sites that had never received DFE were also sampled as well as another seven fields from a wider area around the factory. In comparison with paired sites that had not received effluent, long-term wastewater irrigation resulted in an increase in pH, EC, extractable P, exchangeable Na and K and ESP. These changes were related to the use of phosphoric acid, NaOH and KOH as cleaning agents in the factory. Soil organic C content was unaffected by DFE irrigation but the size (microbial biomass C and N) and activity (basal respiration) of the soil microbial community were increased. These increases were attributed to regular inputs of soluble C (e.g. lactose) present as milk residues in the wastewater. Principal component analysis (PCA) of the soils data from all 11sites confirmed that the main effects of DFE irrigation were an increase in exchangeable Na, extractable P and microbial biomass C, an accumulation of soluble salts and a liming effect. PCA analysis of soil bacterial community structure, using PCR-DGGE of 16S rDNA fragments, generally separated individual sites from one another but did not group them according to irrigation history. Thus, whilst the size and activity of the soil microbial community were increased, the structure and diversity of the bacterial community remained unaffected.

Keywords: Dairy factory, wastewater; effluent, irrigation, soil quality.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1082165

References:

[1] T. J. Britz, C. van Schalkwyk, and Y. Hung, "Treatment of dairy processing wastewaters," in Waste Treatment in the Food Processing Industry, L. K. Wang, Y. Hung, H.H. Lo, and C. Yapijakis, Eds. Boca Raton, Taylor Francis, 2006, pp. 1-28.
[2] R. J. Durham, and J. A. Hourigan, "Waste management and co-product recovery in dairy processing," in: Handbook of Waste Management and Co-product Recovery in Food Processing, Vol. 1, K. Waldron, Ed. Cambridge, Woodhead Publishing, 2007, pp. 332-387.
[3] B. P. Degens, L. A. Shipper, J. J. Claydon, J. M. Russell, and G. W. Yeates, "Irrigation of an allophanic soil with dairy factory effluent for 22 years: response of nutrient storage and soil biota," Aust. J. Soil Res., vol. 38, pp. 25-35, 2000.
[4] G. P. Sparling, L. A. Shipper, and J. M. Russell, "Changes in soil properties after application of dairy factory effluent to New Zealand Treatment Microbial biomass C Microbial biomass N Basal respiration Metabolic quotient mg kg-1 mg kg-1 ╬╝g C g-1 day-1 ╬╝g C mg-1 day-1 Control (1) 164b 30.3a 25.8a 0.16ns Irrigated control 126a 50.7b 22.3a 0.12 Long-term DFE (1) 261c 70.4c 36.5b 0.14 Long-term DFE (2) 282c 72.8c 34.8b 0.12 (a) (b) volcanic ash and pumice soils," Aust. J. Soil Res., vol 39, pp. 505-518, 2001.
[5] D. L. Karlen, M. J. Mausbach, J. W. Doran, R. G. Cline, R. F. Harris, and G. E. Schuman, "Soil quality: a concept, definition and framework for evaluation," Soil Sci. Soc. Amer. J., vol. 61, pp. 4-10, 1997.
[6] J. W. Doran, and T. B. Parkin, "Defining and assessing soil quality," in: Defining Soil Quality for a Sustainable Environment, J. W. Doran, D. C. Coleman, D. F. Bezdiek, and B. A. Stewart, Eds. Madison, Wisconsin, Soil Science Society of America Special Publication No 35, 1994, pp.3- 21.
[7] E. G. Gregorich, M. R. Carter, J. W. Doran, C. E. Pankhurst, and L. M. Dwyer, "Biological attributes of soil quality," in: Soil Quality for Crop Production and Ecosystem Health, E. G. Gregorich, and M. R. Carter, Eds. Amsterdam, Elsevier, 1997, pp. 81-113.
[8] R. F. Isbell, The Australian Soil Classification. Collingwood, Victoria, CSIRO Publishing, 2002.
[9] C. Gourley, I. Awty, and J. Collins, "Waste water applications by Bega Cheese and assessment of impacts on soil characteristics," Victoria Department of Primary Industries Report to Bega Cheese. Ellinbank, Department of Primary Industries, 2007.
[10] G. E. Rayment, and F. R. Higginson, Australian Laboratory Handbook of Soil and Water Chemical Methods. Melbourne, Inkata Press, 1992.
[11] G. Muyzer, E. De Waal, and A. G. Uitterlinden, "Profiling of complex microbial populations by denaturing gradient gel electrophoresis analysis of polymerase chain reaction-amplified genes coding for 16S rRNA," Appl. Environ. Microbiol. vol. 59, pp. 695-700, 1993.
[12] fefewa R. F. Isbell, "The use of sodicity in Australian soil classification systems," in Australian Sodic Soils. Distribution, Properties and Management, R. Naidu, M. E. Sumner, and P. Rengasamy, Eds. Melbourne, CSIRO Publishing, 1995, pp. 41-45.
[13] R. J. Haynes, and M. H. Beare, "Aggregation and organic carbon storage in meso-thermal, humid soils," in Advances in Soil Science. Structure and Organic Matter Storage in Agricultural Soils, M. R. Carter, and B. A. Stewart, Eds. Boca Raton, CRC Press, 1996, pp. 213- 262.
[14] K. C. Cameron, H. J. Di, and M. R. Anwar, "The "critical" ESP value: does it change with land application of dairy factory effluent?" N. Z. J. Agric. Res. vol. 46, pp.147-154, 2003.
[15] N. Hesketh and P. C. Brookes, "Development of an indicator for risk of phosphorus leaching," J. Environ. Qual, vol. 29, pp. 105-110, 2000.
[16] J. C. Menneer, C. D. A. McLay, and R. Lee, "Effects of sodiumcontaminated wastewater on soil permeability of two New Zealand soils," Aust. J. Soil Res. vol. 39, pp. 877-882, 2001.
[17] J. C. Wardle, and A. Ghani, "A critique of the microbial metabolic quotient (qCO2) as a bioindicator of disturbance and ecosystem development," Soil Biol. Biochem. vol. 27, pp. 1601-1610, 1995.
[18] Y-Y. Liu, and R. J. Haynes, "Origin, nature and treatment of effluents from dairy and meat processing factories and the effects of their irrigation on the quality of agricultural soils" Crit. Rev. Environ. Sci. Technol., to be published, 2010.