关键词: 湖心岛分散式养鸭；氮磷污染；沼气池；人工湿地

Abstract:

The pollutant from decentralized duck breeding in Baiyangdian is one of the major sources of its water body. This paper puts forward a controlling mode of decentralizing buck breeding at islet of Baiyangdian, including duck dung collecting system(collecting network, collecting ditch for runoff and washing water), duck dung fermenting methane and waste utilization system, terminal wastewater treatment system. The controlling demonstration engineering was established in an islet with 5 000 m2 land and raising 1 500 ducks at Wangjiazhai Village, Anxin Town, Anxin County. From April to November 2010, the  concentration of COD, TN, TP in wastewater discharged from duck breeding farm was 351 mg/L, 74.2 mg/L, 7.1 mg/L on the rain days, and 214 mg/L, 42.1 mg/L, 5.3 mg/L on non-rainy days, which was lower than allowable discharge standard value of pollutants for livestock and poultry breeding(GB 18596-2001). It could be attributed to the source-collecting 40 percent of duck manure distributed in duck recreation area, and the effective removal of pollutants in wastewater discharged from duck breeding by terminal treatment system. The biogas produced from biogas tank could also be used to meet duck farmers demand for energy in their daily life. In summary, this technology could decrease the pollutants movement from duck breeding farm to the water body. This controlling mode of decentralizing buck breeding at islet is easy, operational, and of extension value.

Key words: decentralized duck breeding at islet, nitrogen and phosphorus pollution, methane pool, constructed wetland