| 摘要: |
| [目的]研究污泥好氧堆肥过程中有机质含量的变化,为提高污泥堆肥质量及正确评价污泥堆肥的肥效提供参考依据.[方法]以城市污泥和小麦秸秆、玉米秸秆为堆肥原料,设置4个处理(处理1调理剂为小麦秸秆糠(d＜5 mm),处理2调理剂为小麦秸秆段(3 cm＜d＜5 cm),处理3调理剂为玉米秸秆糠(d＜5 mm),处理4调理剂为玉米秸秆段(3 cm＜d＜5 cm),进行为期35 d的高温好氧堆肥试验,研究堆肥过程中堆体温度、有机质降解率及水溶性有机碳(DOC),腐殖质(HM)及其组成和纤维素含量的变化.[结果]随着堆肥时间的延长,4个处理的堆体温度呈先升高后降低的变化趋势;堆肥结束时,处理1～4的有机质降解率分别为31.30%,27.09%,54.87%和48.97%;DOC含量呈下降趋势,至堆肥结束时处理1~4的DOC含量分别为9.48,7.15,9.10和11.07 g/kg;4个处理的腐殖质含量均先下降后升高,之后趋于稳定,胡敏酸与富哩酸的比值(H/F)呈逐渐升高趋势,至堆肥结束时,处理1～4的H/F分别为1.54,2.21,1.56和1.90;粗纤维降解缓慢,较难腐殖化.[结论]污泥和玉米秸秆糠混合堆肥效果最佳.H/F、水溶性有机质和温度可作为判断腐熟度的指标. |
| 关键词: 污泥 堆肥 有机碳 水溶性有机碳 腐殖质 粗纤维 |
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| 基金项目:陕西省科技攻关项目 (2005K02-G05-04). |
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| Changes of organic matter content during aerobic co-composting of sewage sludge with straw |
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| Abstract: |
| 【Objective】 Changes of organic matter content during aerobic co-composting of sewage sluge with straw were studied to provide reference for the improvement of the efficiency and quality of the sewage sludge compost fertilizer.【Method】 Aerobic co-composting of sewage sludge mixed with wheat straw and maize straw,lasting 35 d,was carried out.Wheat straw bran (d＜5 mm),wheat straw chip (3 cm＜d＜5 cm),maize straw bran (d＜5 mm) and maize straw chip (3 cm＜d＜5 cm) were amendments in treatment 1～4 respectively.The following parameters were measured at different composting stages:total organic carbon (TOC),dissolved organic carbon (DOC),humic substances content (humic and fulvic acid),H/F and fiber.The role and relevance of DOC, H/F and temperature, used as parameters of compost maturity, were analyzed.【Result】 TOC decreased during composting process constantly,Dec of TOC reached 31.30%,27.09%, 54.87% and 48.97% respectively;DOC concentration declined to 9.48,7.15,9.10 and 11.07 g/kg gradually;humus content didn't increase significantly;H/F,increased to 1.54, 2.21,1.56 and 1.90 respectively in the four treatments;Fiber was degraded slowly. 【Conclusion】 The results showed Maize straw bran is the best amendment in composting.H/F,temperature and dissolved organic carbon can be used as indicators of compost maturity. |
| Key words: sewage sludge compost organic carbon dissolved organic carbon (DOC) HM fiber |
