Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, Zhejiang A&F University, Hangzhou, 311300, China.
Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou, 310023, China.
Chemosphere. 2020 Mar;243:125331. doi: 10.1016/j.chemosphere.2019.125331. Epub 2019 Nov 12.
The effects of reaction temperature, residence time, sulfuric acid and potassium hydroxide on the total concentration and speciation of N and P, potentially toxic elements (salts and metal elements) of pig manure during its hydrothermal carbonization (HTC) were investigated. Concentrations of Cl, K, Na and Mg in the hydrochars were much lower but total N, P and nitrate-nitrogen (NO-N) contents were significantly higher than in untreated pig manure. The acid-extractable fractions of Cu and Zn in hydrochars were 0.03-0.63 and 0.17-0.66 times lower than those in pig manure and decreased significantly with increasing reaction temperature. The addition of sulfuric acid (H2SO4) or potassium hydroxide (KOH) in HTC reduced the contents of P, Ca, Mg, Cl and heavy metal elements (HMEs) in hydrochars, and the removal rates of Cu and Zn were up to 55% and 59%, respectively. Overall, the rapid treatment of pig manure by HTC reduced the harm of salts and HMEs, and effectively recovered the nutrients in pig manure. The HTC under alkaline conditions was desirable for optimizing the main elemental composition of the hydrochars.
研究了水热碳化（HTC）过程中反应温度、停留时间、硫酸和氢氧化钾对猪粪中总氮和磷浓度及形态、潜在毒性元素（盐和金属元素）的影响。水热炭中 Cl、K、Na 和 Mg 的浓度要低得多，但总氮、磷和硝酸盐氮（NO-N）的含量明显高于未经处理的猪粪。水热炭中 Cu 和 Zn 的酸可提取分数分别比猪粪低 0.03-0.63 和 0.17-0.66 倍，且随着反应温度的升高而显著降低。在 HTC 中添加硫酸（H2SO4）或氢氧化钾（KOH）可降低水热炭中 P、Ca、Mg、Cl 和重金属元素（HMEs）的含量，Cu 和 Zn 的去除率分别高达 55%和 59%。总的来说，HTC 可快速处理猪粪，降低盐分和 HMEs 的危害，有效回收猪粪中的养分。碱性条件下的 HTC 有利于优化水热炭的主要元素组成。
