Main Article Content
The development of industrial activities is the source of the production of large quantities of wastewater. The last-mentioned are rejected in the environment often without any prior treatment and have serious short-term and sometimes long-term environmental consequences. The objective of this work is to assess the environmental impacts and to propose a process for treating wastewater of reject from Bayo dairy in Brazzaville-Congo. The samples were taken at four (4) stations before, during and after production of dairy products. Multivariate statistical analysis of the physicochemical data was carried out using Statistica 7.1 software. The results obtained show that the wastewater from the Bayo dairy has a basic pH which fluctuates between 8.32 and 9.17 with standard temperatures of reject. The salinity of the wastewater increases greatly during production, which shows rising mineralization. The contents of MES (49.78-181.80 mg/L), MO (40.23-72.64 mg O2/L), COD (51.08-98.91 mg O2/L), BOD5 (34.80-59.50 mg O2/L) and the turbidity (26-179) NTU are moderately high and reflect an increase pollutant load before, during and after production of dairy products in stations S2 and S3. The COD/BOD5 ratio reveals that the Bayo dairy wastewater is moderately biodegradable before, during and after production with a biodegradability coefficient which varies between 1.40 and 1.78. The ACP approves possible industrial pollution from wastewater from the Bayo dairy and reports on the impact of the rejects in the environment. Thus, this study is a contribution to raising awareness among the Congolese population and decision-makers on the quality of wastewater rejected by local industries.
Wildbrett G. Dairy plant effluent: Nature of pollutants. In: Roginski H, et al. (Eds) Encyclopedia of Dairy Sciences, Elsevier, Oxford; 2002.
Sarkar B, Chakrabarti PP, Vijaykumar A, Kale V. Wastewater treatment in dairyindustries - Possibility of reuse, desalination. Elsevier. 2006;195(1-3):141-152.
Regional Activity Center for Cleaner Production (RAC / CP) -Action plan for the Mediterranean. Pollution prevention in the dairy industries. 2002;164.
Djelal H, Perrot M. Use of specific fungi for the biodegradation of industrial effluents. 2007;306:85-90.
Moletta R, Torrijos M. Environmental impact of the dairy industry, engineering techniques. Treatise on Process Engineering, France, Paris. 1991;15:1-9.
Congo. Law no 003/91 of 23 April 1991 on the protection of the environment, Brazzaville. 1991;10.
Mara DD. Sewage treatment in hot climates. Ed. John Willey and Sons; 1980.
Vennetier P. Géographie du Congo Brazzaville, higher education in Central Africa, Gautier-Villas- Paris. 1966;174.
Rodier J, Merlet N, Legube B. Water analysis. 9th Ed, Dunod, Paris. 2009;1579.
Murphy J, Riley JP. A modified single solution method for the determination of phosphate in natural waters. Anal Chim Acta. 1962;27:31-36.
Lagarde J. Introduction to data analysis. Ed. Dunod, Paris; 1995.
Baccini A. Multidimensional descriptive statistics (For dummies). Paul Sabatier University, Toulouse Mathematics Institute, Toulouse. 2010;33.
Departmental Direction of Agriculture and Forest of the Eastern Pyrenees. Arreté n ° 2820 of 06 August 2007, authorizing under the water and aquatic environment code, Préfecture des Pyrenées Orientales. 2007;12.
Senegalese standards, NS 05-061. 2001;27.
Sachon G. The dairy industry and water pollution. ENIL Review. 1980a;1(49):7-12.
Hamdani A, Moufti A, Mountadar M, Assobhei O. Evolution of the physico-chemical and bacteriological quality of a dairy effluent over an annual cycle. French-language review of industrial ecology, n ° 37, 1st Quarter; 2005.
Bremont R, Vuichard R. Parameters of water quality. Ed Firmin-Didot SA, Paris; 1973.
Le Graet Y, Brulé G. Mineral balances of milk: influence of pH and ionic strength. Elsevier / lNRA. 1993;73:51-60.
Chorus I, Bartram J. Toxic cyanobacteria in water: A guide to their public health consequences, monitoring and management. London, E, FN Spon on behalf of the World Health Organization, Geneva; 1999.
Vander Borght P, Ska B. Eutrophication and quality of the Semois waters. Water Tribune. 1989;42(538):7-14.
WHO. Wastewater use in agriculture. 2012;2:254.
EL Ahmed G, Khalid RT. Study of physico-chemical characteristics of waste water of an industrial zone of Tétouan. International Journal of Innovation and Applied Studies. 2017;20(3):840-849.
Hamdani A, Chennaoui M, Assobhei O, Mountadar M. Characterization and treatment by coagulation settling of a dairy effluent. INRA, EDP Sciences. 2004;317-328.
Metcalf Eddy. Inc. Wastewater engineering: Treatment and reuse. 4th Ed, Mc Graw-Hill New York. 2003;1819.
Hazourli S, Boudiba L, Ziati M. Characterization of pollution of waste water from the El-Hadjar industrial zone, Annaba. Larhyss Journal. 2007;6:45-55.
Kaiser HF. The application of electronic computers to factor analysis. Educ. Psychol. Meas. 1960;20:141-151.