氨三乙酸对好氧堆肥过程中氮素保存效果的影响

以食品厂污水处理剩余污泥和玉米秸秆为堆肥原料,研究了氨三乙酸(NTA)在好氧堆肥过程中的保氮效果.结果表明,添加NTA可以提高好氧堆肥过程中氮素的保存和有机物的降解效率,当NTA的添加量为2.5％时,3d内堆体即可到达高温期,高温期持续时间为9 d.与空白对照相比,堆肥结束时,NH3累积挥发量减少了15.20％,铵态氮...

Effect of nitrilotriacetic acid on nitrogen conservation during aerobic composting

The waste activated sludge from wastewater treatment of food industry and corn stalks were used as raw composting materials, and the nitrogen retention efficiency of nitrilotriacetic acid (NTA) during aerobic composting was studied. The results showed that the addition of NTA improved the efficiency of nitrogen retention and organic matter degradation during aerobic composting. When the dosage of NTA added was 2.5%, a high temperature period was reached within 3 days, and lasted 9 days. Compared with the control, the cumulative NH3 volatilization decreased by 15.20%, and the contents of ammonium, nitrate, and Kjeldahl nitrogen increased by 242%, 10.54% and 10.62%, respectively, at the end of composting. At the same time, the cumulative carbon dioxide emissions increased by 13.47 %, and the total organic carbon content was reduced by 1.4%. The C/N ratio and seed germination index for the compost product were 8.84 and 95.46%, respectively, which met the requirements of maturity, at the end of composting. During the composting, NTA was hydrolyzed to produce H+, which was combined with NH3 produced by the ammoniation reaction. It was conducive to the preservation of nitrogen in the heap and improved the fertilizer efficiency of the compost products. The research result provided a useful reference for the optimization of the nitrogen retention during aerobic composting.