中国农村水利水电
中國農村水利水電
중국농촌수이수전
CHINA RURAL WATER AND HYDROPOWER
2015年
5期
72-76,80
,共6页
反硝化%碳源%农业排水
反硝化%碳源%農業排水
반초화%탄원%농업배수
denitrification%carbon substrate%agricultural drainage
农业排水中的硝酸盐为地表水氮素污染的最主要来源之一，反硝化生物脱氮是一种具有应用前景的削减农业排水中硝酸盐浓度的技术手段，它需要外加碳源来维持持续的反硝化反应。本研究选用了易于获取的农业废弃物玉米芯、麦秸、木屑作为碳源。在反硝化体系中加入不同体积的牛粪液，利用牛粪液所含的木质纤维素降解菌群，促进3种碳源释放小分子有机物。结果表明，在不添加牛粪液的情况下，使用麦秸的反应体系具有最高的累积硝酸盐去除量，其余依次为使用玉米芯和木屑，牛粪液的加入能加强使用3种碳源的各反应体系对硝酸盐的去除。对固相物质分析表明，使用玉米芯和麦秸的反应体系虽然能去除更多的硝酸盐，但两碳源所含易降解成分较多，自身的降解程度也更高，对长期反硝化而言不利。
農業排水中的硝痠鹽為地錶水氮素汙染的最主要來源之一，反硝化生物脫氮是一種具有應用前景的削減農業排水中硝痠鹽濃度的技術手段，它需要外加碳源來維持持續的反硝化反應。本研究選用瞭易于穫取的農業廢棄物玉米芯、麥秸、木屑作為碳源。在反硝化體繫中加入不同體積的牛糞液，利用牛糞液所含的木質纖維素降解菌群，促進3種碳源釋放小分子有機物。結果錶明，在不添加牛糞液的情況下，使用麥秸的反應體繫具有最高的纍積硝痠鹽去除量，其餘依次為使用玉米芯和木屑，牛糞液的加入能加彊使用3種碳源的各反應體繫對硝痠鹽的去除。對固相物質分析錶明，使用玉米芯和麥秸的反應體繫雖然能去除更多的硝痠鹽，但兩碳源所含易降解成分較多，自身的降解程度也更高，對長期反硝化而言不利。
농업배수중적초산염위지표수담소오염적최주요래원지일，반초화생물탈담시일충구유응용전경적삭감농업배수중초산염농도적기술수단，타수요외가탄원래유지지속적반초화반응。본연구선용료역우획취적농업폐기물옥미심、맥갈、목설작위탄원。재반초화체계중가입불동체적적우분액，이용우분액소함적목질섬유소강해균군，촉진3충탄원석방소분자유궤물。결과표명，재불첨가우분액적정황하，사용맥갈적반응체계구유최고적루적초산염거제량，기여의차위사용옥미심화목설，우분액적가입능가강사용3충탄원적각반응체계대초산염적거제。대고상물질분석표명，사용옥미심화맥갈적반응체계수연능거제경다적초산염，단량탄원소함역강해성분교다，자신적강해정도야경고，대장기반초화이언불리。
Nitrate in agricultural drainage water has been one of the most contributing sources of nitrate contamination of surface wa‐ter in China .Denitrifying bioreactors belong to a promising technology of reducing the amount of nitrate ,in which an external carbon is necessary to the maintenance of continuous denitrification .Corn cob ,wheat straw and woodchips are chosen as carbon substrates for denitrifying bioreactors in this study ,for they are easily available at farmland .Cow dung liquid can accelerate the degradation of lignocellulose materials and the stimulation of three carbon substrates is evaluated .Without mixing with cow dung liquid ,all the three substrates stimulates NO3 -N removal and the cumulative NO3 -N removed at 30th day from highest to lowest was :wheat straw ,corn cob and woodchips .The addition of cow dung liquid stimulates more NO3 -N removal .An analysis of weights of solid-phase shows that corn cob and wheat straw lead to higher NO3 -N removal rates than woodchips ,but these two substrates degrades more rapidly ,which can not maintain long-term denitrification .The addition of cow dung liquid to woodchips increases significantly NO3 -N removal rates over woodchips alone ,but the rates are still much less than that of corn cob and wheat straw .
