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Development of a Biological Filter Utilizing Organic Growth Media for Wastewater Treatment and Nitrogen Oxidation

Journal of Agricultural Science and Technology(B) 2012年第1期2卷 62-73页

作者： troy francis davis Ronald Erie Sheffield Steven George Hall Brian Dawson LeBlanc Chandra SekharTheegala Department of Biological and Agricultural Engineering Louisiana State University AgCenter Baton Rouge 70803 Louisiana70803 United States LSU AgCenter Callegari Environmental Center Baton Rouge 70803 Louisiana 70803 United States

Loss of ammonia-nitrogen to volatilization and the over application of phosphorus in agricultural wastewaters has led to excess phosphorus build up in topsoil and in surface waters. In order to increase the usable amount nitrogen in agricultural wastewaters, the wastewaters underwent a nitrogen treatment process consisting of a hanging basket biological filter. The filters utilized never before used biological growth media, rice hulls, to assist in the formation of a mature biofilms as the oxidation of ammonia to nitrate. The filter design was used on a lab scale that treated both artificial wastewater and dairy parlor wastewater treated with a lime precipitation step for phosphorus treatment. The filters were tested to see if bio-fouling occurred in the filter media bed under high nitrogen loading, if the rice hulls could withstand an extended time frame as bacterial growth media, and to see if the oxidation of ammonia to nitrate would occur. A 50% reduction in ammonia occurred between 30 and 48 hrs in each trial with eventual nitrite oxidation reported in the final two trials. Statistical analysis preformed determined that the ammonia removal rates at the beginning of both the synthetic wastewater and dairy parlor wastewater ten-day tests were statistically similar, but varied toward the end of the trials.

关键词：有机废水处理生物过滤生长介质氮氧化开发利用亚硝酸盐农业废水试验报告

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Trust,politics and post-IPO performance:SOEs *** private sector

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Economic and Political Studies 2022年第3期10卷 290-313页

作者： Bill francis Iftekhar Hasan Xian Sun Mingming Zhou Lally School of Management Rensselaer Polytechnic InstituteTroyNYUSA Gabelli School of Business Fordham UniversityNew YorkNYUSA Bank of Finland HelsinkiFinland Business School University of SydneySydneyAustralia Carey Business School Johns Hopkins UniversityBaltimoreMDUSA Lubin School of Business Pace UniversityNew YorkNYUSA

This paper empirically investigates the role of social trust in the long-term performance of the initial public offerings(IPOs)in China,controlling for the formal institutional *** find that privately owned or smaller IPO firms experience signifi-cantly better post-IPO performance when they are incorporated in regions with more social *** state-owned and bigger IPO firms,on the other hand,experience better long-term post-IPO performance when they are incorporated in regions with stronger formal institutions(*** enforcement and contract holding).Political pluralism turns out to benefit all IPOs in the long *** addition,our evidence shows that stronger social trust substitutes for the quality of court enforcement but complements the role of contract *** results are robust after controlling for alternative definitions of ownership,outliers,non-linear effects of institutions,and the potential endogeneity of institutions in the model.

关键词： Institution social trust political pluralism IPO China

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