Objectives To monitor the quality of drinking water for residents surrounding some pig farms in Hezhou City, Guangxi Province, understand the hygienic situation of decentralized water supply, find out potential safety hazards, and provide scientific basis for ensuring public safety of drinking water and making governmental decisions.
Methods One water sample was collected from each of 118 wells around pig farms in the Pinggui Administration District of Hezhou City, Guangxi province.A total of 12 items, including the total number of colonies, total coliforms, Escherichia coli, thermotolerant coliforms, chroma, turbidity, smell and taste, pH, oxygen consumption, ammonia, nitrate nitrogen and nitrite nitrogen were tested; and testing results were analyzed statistically by SPSS 13.0.
Results Only 9 water samples were qualified for all 12 items, the qualified rate was 11.9%; only 13 water samples were qualified for 4 microorganism items, the qualified rate was 12%; and only 70 water samples were qualified for 8 physical and chemical items, the qualified rate was 59.3%.The main unqualified item was nitrate nitrogen (64.4%).
Conclusions The safety of drinking water collected from decentralized water supply around pig farms was serious.Strengthening management and providing necessary knowledge and technical guidance for those pig farmers should be conducted by relevant government departments in order to raise their awareness and ensure the quality of drinking water.
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