TI:Study on the Effect of Housefly Larvae on Pig Manure Treatment

AU:XU Dagang , WU Jianhua , YANG Heping , et al .

AD:Department of Microbiology and Parasitology , S hanghai Second Medical University , S hanghai 200025 ,China

【Abstract】Objective To observe the treatment results and the quantitative change of 32MI , COD and BOD5 in the pig manures after housefly larvae treated. Methods About 4 000 housefly adults were random selected. Their eggs laid in height period of oviposition incubated in pig manure. Housefly larvae and surplus manure were weighted after one week of the treatment manure , and change of the number of colibacillary colony was observed. The contents of 32MI , COD , BOD5 and NH32N were detected in treated and non2treated pig manure. Results The weight of the pig manure averagely decreased to 53. 73 %254. 83 % of untreated manure , weight of larvae is 10. 49 %211. 34 % of the pig manure. The colibacillarg colong in manure treated per grom was 99. 96 % less than that untrented. The contents of 32MI , COD and BOD5 in the treated pig manure were 92. 80 %, 54. 20 % and 75. 30 % than those in untreated manure , respectively. The variation was significant ( P < 0. 01) . But the content of NH3 2N decreased 6. 30 % only with out significant variation ( P > 0. 05 ) . Conclusion These results showed that it is possible of reduce discharge of manure and the contents of 32MI , COD and BOD in the pig manure. To reduce the environment pollution of pig manure by treating pig manure with housefly larvae.

【Key words】　Housefly larvae ; Pig manure ; Colibacillary ; 32MI ; COD ; BOD5