Effect of Biochar on Transformation of Dissolved Organic Matter and DTPA-Extractable Cu and Cd During Sediment Composting

2021 ◽  
Author(s):  
Meihua Zhao ◽  
Caiyuan Cai ◽  
Zhen Yu ◽  
Hongwei Rong ◽  
Chaosheng Zhang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Seed Germination ◽  
Dissolved Organic Matter ◽  
Benzene Ring ◽  
Negative Impact ◽  
Maturation Period ◽  
Organic Matters ◽  
Extractable Metals

Abstract This study investigated the influence of biochar on temperature, pH, organic matter (OM), seed germination (GI), the fluorescent components of dissolved organic matter (DOM), and bioavailability of DTPA-extractable Cu and Cd during composting and analyzed the relation between DTPA-extractable metals with pH, OM, and the fluorescent components of DOM. Results showed that the addition of biochar shortened the thermophilic phase, reduced the pH at maturation period, accelerated the decomposition of OM, and raised GI. Besides, it promoted the formation of components with benzene ring in FA and HyI and the degradation of protein-like organic-matters in FA and HA, which was mainly related with the decrease of DTPA-extractable Cd and the increase of DTPA-extractable Cu. After composting, DTPA-extractable Cd in pile A and pile B were decreased by 37.15% and 27.54%, respectively, while the bioavailability of Cu in pile A and pile B were increased by 65.71% and 68.70%, respectively. All these findings demonstrate positive and negative impact produced by biochar into various heavy metals and the necessary of optimization measures with biochar in sediment composting.

scholarly journals Heavy-metal pollution alters dissolved organic matter released by bloom-forming Microcystis aeruginosa

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18421-18427 ◽  
Author(s):  
Haiming Wu ◽  
Li Lin ◽  
Guangzhu Shen ◽  
Ming Li
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Microcystis Aeruginosa ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Aquatic Ecosystems ◽  
Eutrophic Lakes

The risk of heavy metals to aquatic ecosystems was paid much attention in recent years, however, the knowledge on effects of heavy metals on dissolved organic matter (DOM) released byMicrocystiswas quite poor, especially in eutrophic lakes.

scholarly journals Extraction and Composition of Dissolved Organic Matter in Poyang Lake and Its Effects on Morphological Changes of Heavy Metals

2021 ◽  
Author(s):  
Yuanhang Li ◽  
Zhaoying Sheng ◽  
Xiaofeng Gong ◽  
Huiqing Zeng ◽  
Chunli Chen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Water Body ◽  
Regional Integration ◽  
Poyang Lake ◽  
Morphological Changes ◽  
Fluorescence Excitation ◽  
Activation Effect ◽  
Fluorescence Regional Integration

Abstract Dissolved organic matter (DOM) is generally thought to impact the bioavailability of heavy metals. However, the source of wetland DOM and its interaction with heavy metals remain poorly understood. Fluorescence excitation emission matrices (EEMs)-fluorescence regional integration (FRI) coupling techniques and chromophoric dissolved organic matter (CDOM) was used to explore the source of DOM of Poyang Lake including water body, soil and plants, and the effects on morphological changes of heavy metals. The results showed that the best DOM extraction effect can be obtained with the soil-water mass ratio 1:10, centrifuged at 4 000 rpm for 30 min, and the 0.45 μm glass fiber filter by orthogonal test. There were four types of peaks of DOM in water body of Poyang Lake, which was input mainly by land source, while six types of peaks (ACTDBE) were observed in soil. Soil DOM is highly humified with large molecular weight. More types of fluorescent peaks were observed in plant and the content of DOM in plants was higher than that of water body and soil due to the plant proteins. The content of fulvic acid was less than tryptophan in DOM of Triarrhena lutarioriparia and Phragmites communis in Longkou, while the opposite were in other samples. Furthermore, pot experiment illustrated that DOM had an activation effect on Cd, Cu and Zn and a passivation effect on Cr and Pb with the increase of DOM content. After the addition of exogenous DOM, Cr, Pb and Zn were immobilized by the function together with DOM and plants, while Cd and Cu were activated.

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