Differential release of sewage sludge biochar-borne elements by common low-molecular-weight organic acids

Vause, Danielle; Heaney, Natalie; Lin, Cheng‐Fang

doi:10.1016/j.ecoenv.2018.09.005

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…Most of the metabolites present were nutrients required for the growth of banana plants and soil microorganisms, which may be the result of microbial competition as well as mutually beneficial microbial relationships in the banana rhizosphere soil. Some studies have found that organic acids and sugars can be preferentially used as nutrients by certain bacteria, enhancing the acquisition of organic matter and phosphorus by crops, promoting the formation of some rhizosphere bacterial biofilms, and releasing toxic elements from the soil ( Cheng, Zhang & He, 2019 ; Vause, Heaney & Lin, 2018 ; Voges et al, 2019 ). Metabolomics technology allows us to better understand the composition of metabolites in the rhizosphere, but the current metabolomic database is incomplete and in need of further development and improvement.…”

Section: Discussionmentioning

confidence: 99%

Dynamic analysis of the microbial communities and metabolome of healthy banana rhizosphere soil during one growth cycle

Wang

Wei

et al. 2022

PeerJ

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Background The banana-growing rhizosphere soil ecosystem is very complex and consists of an entangled network of interactions between banana plants, microbes and soil, so identifying key components in banana production is difficult. Most of the previous studies on these interactions ignore the role of the banana plant. At present, there is no research on the the micro-ecological environment of the banana planting growth cycle. Methods Based on high-throughput sequencing technology and metabolomics technology, this study analyzed the rhizosphere soil microbial community and metabolic dynamics of healthy banana plants during one growth cycle. Results Assessing the microbial community composition of healthy banana rhizosphere soil, we found that the bacteria with the highest levels were Proteobacteria, Chloroflexi, and Acidobacteria, and the dominant fungi were Ascomycota, Basidiomycota, and Mortierellomycota. The metabolite profile of healthy banana rhizosphere soil showed that sugars, lipids and organic acids were the most abundant, accounting for about 50% of the total metabolites. The correlation network between fungi and metabolites was more complex than that of bacteria and metabolites. In a soil environment with acidic pH, bacterial genera showed a significant negative correlation with pH value, while fungal genera showed no significant negative correlation with pH value. The network interactions between bacteria, between fungi, and between bacteria and fungi were all positively correlated. Conclusions Healthy banana rhizosphere soil not only has a stable micro-ecology, but also has stable metabolic characteristics. The microorganisms in healthy banana rhizosphere soil have mutually beneficial rather than competitive relationships.

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Section: Discussionmentioning

confidence: 99%

Dynamic analysis of the microbial communities and metabolome of healthy banana rhizosphere soil during one growth cycle

Wang

Wei

et al. 2022

PeerJ

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“…The biochar used in this study contained soluble Ca at a concentration of 0.31 g/kg (Table 1). It is also possible that LMWOAs could solubilize biochar-borne minerals, such as aluminuim, calcium, and iron compounds [26]. The Ca 2+ entered into the solutions from the biochar allowed formation of CaNO 3 + that could be adsorbed to the negatively charged site on the new biochar surfaces, as described in Equation (2).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, protonation of biochar surfaces that simultaneously takes place during LMWOA-driven acidification may favor adsorption of soluble phosphate ions, resulting in re-immobilization of the solution-borne phosphate. LMWOA-driven acidification could also solubilize biochar-borne Al and Fe hydroxides [26,27]. Additionally, it is therefore possible that the soluble phosphate can react with the dissolved Al and Fe to form insoluble aluminium and iron phosphates [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Behaviors of Organic Ligands and Phosphate during Biochar-Driven Nitrate Adsorption in the Presence of Low-Molecular-Weight Organic Acids

Xiong

Ying

et al. 2022

Molecules

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A batch experiment was conducted to examine the behavior of nitrate, organic ligands, and phosphate in the co-presence of biochar and three common low-molecular-weight organic acids (LMWOAs). The results show that citrate, oxalate, and malate ions competed with nitrate ion for the available adsorption sites on the biochar surfaces. The removal rate of LMWOA ligands by the biochar via adsorption grew with increasing solution pH. The adsorbed divalent organic ligands created negatively charged sites to allow binding of cationic metal nitrate complexes. A higher degree of biochar surface protonation does not necessarily enhance nitrate adsorption. More acidic conditions formed under a higher dose of LMWOAs tended to make organic ligands predominantly in monovalent forms and failed to create negatively charged sites to bind cationic metal nitrate complexes. This could adversely affect nitrate removal efficiency in the investigated systems. LMWOAs caused significant release of phosphate from the biochar. The phosphate in the malic acid treatment tended to decrease over time, while the opposite was observed in the citric- and oxalic-acid treatments. This was caused by re-immobilization of phosphate in the former due to the marked increase in solution pH over time.

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“…Therefore, the acidity of sludge dewatering needs to be determined according to the type of sludge, and the optimal pH value range of acid treatment is usually controlled as 2–3 . In addition to the above common inorganic acids, tannic acid, peracetic acid, oxalic acid, and other organic acids have been reported in sludge dewatering . The principle of their action mainly depends on inducing the denaturation of hydrophilic protein or the molecular structure of EPS.…”

Section: The Methods Of Sludge Conditioning For Dehydrationmentioning

confidence: 99%

“…136 In addition to the above common inorganic acids, tannic acid, peracetic acid, oxalic acid, and other organic acids have been reported in sludge dewatering. 137 The principle of their action mainly depends on inducing the denaturation of hydrophilic protein or the molecular structure of EPS. Compared with hydrochloric acid and sulfuric acid, oxalic acid can not only provide H+ but also further promote the dissolution of Fe 3+ and Al 3+ in sludge.…”

Section: Ultrasonication and Microwavementioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Municipal sludge is an inevitable byproduct during the treatment of wastewater, which is produced by sewage treatment plants in urban residential areas, and it contains pathogens, heavy metals, and other pollutants. Municipal sludge is suitable for application in energy utilization because of its high organic content and relatively low toxic matter. The high moisture content of municipal sludge brings huge difficulties to its harmless disposal and resource utilization. At present, the main method used for sludge dehydration is mechanical dewatering. However, the mud cake produced by this method still has a water content of up to 80%, which does not meet the current rigorous requirements. Therefore, the development of deep dehydration technology for sludge is imperative. In this paper, the basic properties and structure of sludge were summarized. As a key component of sludge flocs, extracellular polymeric substance (EPS) has received much attention in sludge dewatering conditioning. Meanwhile, the influencing factors of sludge dewatering were also fully elaborated, including sludge types, sewage hardness, surface charge, size distribution, and sludge viscosity. And the main methods of sludge dewatering treatment were comprehensively included, namely, the physical method, chemical method, biological method, and combined conditioning methods. The advantages and disadvantages of each method are mentioned, and their application situations were analyzed. Furthermore, comment was provided on the conditioning mechanism, adaptability, prospects, and limitations of the techniques for improving sludge dewatering. This systematic review related to sludge dewatering can not only provide reference information for the conditioning method but also benefit the exploitation of efficient and ecofriendly sludge dewatering technology.

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Differential release of sewage sludge biochar-borne elements by common low-molecular-weight organic acids

Cited by 14 publications

References 27 publications

Dynamic analysis of the microbial communities and metabolome of healthy banana rhizosphere soil during one growth cycle

Dynamic analysis of the microbial communities and metabolome of healthy banana rhizosphere soil during one growth cycle

Behaviors of Organic Ligands and Phosphate during Biochar-Driven Nitrate Adsorption in the Presence of Low-Molecular-Weight Organic Acids

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

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