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Journal of Henan Agricultural University. 2019, (06) Core

Effects of peanut shell biochar on dynamic changes of nutrient elements and heavy metals during sewage sludge compostingChinese Full TextEnglish Full Text (MT)

YUE Jianzhi;CHANG Xingtao;LI Hui;WAN Zhengkai;LI Gang;JIA Yangyang;LIANG Hang;College of Mechanical ＆ Electrical Engineering,Henan Agricultural University;Zhengzhou Sewage Purifying Co.,Ltd.;College of Sciences,Henan Agricultural University;

Abstract: In order to explore the harmless utilization of urban sludge,the aerobic composting at high temperature was conducted using peanut shell biochar（ PB）,urban sludge and straw. Sludge with straw was treated with three different contents of peanut shell charcoal（ 10%,20%,30%） under constant temperature of 60℃ for 30 d. Sludge plus straw without peanut shell carbon served as control. The pH,electrical conductivity（ EC）,total nitrogen（ TN）,ammonium nitrogen（ NH4+-N）,nitrate（ NO3--N）,total phosphorus（ TP）,available phosphorus（ AP）,total potassium（ TK）,available potassium（ AK）,total Cu,total Zn and the different fractions value of heavy metals（ HMs） were detected. Compared with initial values,the growth rates of EC in four treatments were 113.20%,98.98%,89.62%and 79.82%,respectively. The increases of pH values were 1.13%,4.63%,5.06%,and 6.51%,respectively. At the end of the experiment,the loss rates of TN in four treatments were 18.96%,16.25%,12.51% and 12.44% respectively,the lost rates of NH4+-N were 89.20%,87.11%,84.11%,and 82.43%,respectively; 45.51%,44.10%,30.01%,19.08% for NO3-N loss rates,respectively;11.04%,10.69%,9. 67%,1. 76% for AP loss rates,respectively; while TP growth rates were 19.72%,42.03%,62.26%,and 89.99%,respectively. Since potassium content was rich in the peanut shell biochar,the growth rates of TK after composting were 63.59%,81.21%,91.14%,94.05%,respectively and the growth rates of AK content were 23.21%,11.58%,2.11%,and 3.21%,respectively. The maximum passivation rate of Cu was 9.72% when 30% PB was added. As for Zn,only 30% PB addition could reduce the activation of Zn. The results indicated that the piles with PB exhibited a lower value of EC and a higher value of pH than those of CK. It could also improve the composting environment and promote the adsorption of the nutrients in the compost because of its porous characteristics. Moreover,the basicity and a large number of functional groups such as carboxyl groups and hydroxyl groups positively affected the reduction of the bioavailable heavy metals.
Keywords：

composting; peanut shell biochar; sewage sludge; nutrient contents; forms of heavy metals; dynamic changes;

  • DOI：

    10.16445/j.cnki.1000-2340.20191120.004

  • Series：

    (D) Agriculture; (B) Chemistry/ Metallurgy/ Environment/ Mine Industry

  • Subject：

    Environment Science and Resources Utilization; Fundamental Science of Agriculture; Agronomy

  • Classification Code：

    S141.4;X703

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