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Bioavailability of dissolved organic matter in biogas slurry enhanced by catalytic ozonation combined with membrane separation.
Ecotoxicology and Environmental Safety ( IF 6.8 ) Pub Date : 2020-03-31 , DOI: 10.1016/j.ecoenv.2020.110547
Lipeng Gu 1 , Xin Tang 1 , Ying Sun 1 , Huijuan Kou 2
Affiliation  

Large molecular weight pig biogas slurry (L-PBS) and small molecular weight pig biogas slurry (S-PBS) were separated from original pig biogas slurry (O-PBS) using a 100 kDa membrane. The original bioavailability and biosafety of L-PBS was very low. In order to enhance the total bioavailable dissolved organic nitrogen (TB-DON) and total bioavailable dissolved organic phosphorus (TB-DOP), optimum catalytic ozonation of L-PBS conditions were determined using Box-behnken design models (P < 0.0001) and intersection tests. The optimal values for ozone concentration, pH value, active catalyst concentration and reaction time were 2.63 mg·L−1, 6.48, 1.43 g·L−1 and 40 min, respectively. Catalytic ozonation can effectively decompose and transform 68.07% of L-PBS into S-PBS to improve content organic bioavailability, with a molecular weight distribution of 0–1 kDa (13.53%), 1–5 kDa (16.62%), 5–10 kDa (11.16%), 10–30 kDa (11.73%), 30–100 kDa (15.04%). Catalytic ozonation of L-PBS can reduce protein levels from 85.28% to 47.18%, but increases the proportion of fulvic and humic components from 10.22% to 32.67% and 4.51%–20.15%, respectively. Because catalytic ozonation changes the internal components and molecular weights of L-PBS, both saw increases in TB-DON and TB-DOP from 3.33% to 41.12% and 2.43%–37.88%, respectively, with a large number of TB-DON and TB-DOP derived from hydrophilic organic components during catalytic ozonation. These important internal mechanisms changed by catalytic ozonation can effectively reduce the ecotoxicity (IR, from 76.5% to 33.1%) and phytotoxicity (GI, enhanced from 35.4% to 70.3%) of L-PBS. Therefore, catalytic ozonation combined with membrane separation is a choice technology in improving the nutrition of biogas slurry and reduce its ecological risk.



中文翻译:

催化臭氧化结合膜分离提高了沼液中溶解有机物的生物利用度。

使用100 kDa膜将高分子量猪沼气浆(L-PBS)和小分子量猪沼气浆(S-PBS)与原始猪沼气浆(O-PBS)分离。L-PBS的原始生物利用度和生物安全性很低。为了提高总生物利用度溶解有机氮(TB-DON)和总生物利用度溶解有机磷(TB-DOP),使用Box-behnken设计模型(P  <0.0001)和交点确定了L-PBS条件的最佳催化臭氧氧化测试。臭氧浓度,pH值,活性催化剂浓度和反应时间的最佳值分别为2.63毫克·L -1,6.48,1.43克·L -1和40分钟。催化臭氧化可以有效地分解68.07%的L-PBS并将其转化为S-PBS以提高含量的有机生物利用度,其分子量分布为0–1 kDa(13.53%),1–5 kDa(16.62%),5–10 kDa(11.16%),10–30 kDa(11.73%),30–100 kDa(15.04%)。L-PBS的催化臭氧氧化可将蛋白质含量从85.28%降低到47.18%,但将黄腐和腐殖质组分的比例分别从10.22%增加到32.67%和4.51%–20.15%。由于催化臭氧化作用改变了L-PBS的内部成分和分子量,因此TB-DON和TB-DOP分别从3.33%增加到41.12%和2.43%–37.88%,其中大量TB-DON和TB-DOP在催化臭氧化过程中源自亲水性有机成分。催化臭氧化作用改变了这些重要的内部机制,可有效降低L-PBS的生态毒性(IR,从76.5%降至33.1%)和植物毒性(GI,从35.4%提升至70.3%)。因此,催化臭氧化与膜分离相结合是改善沼液营养并降低其生态风险的一种选择技术。

更新日期:2020-03-31
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