Preparation of non-sintered sewage sludge based ceramsite by alkali-thermal activation and hydration mechanism

Ma, Chi; Bao, Shenxu; Zhang, Yimin; Luo, Yongpeng; Gui, Yaqiong; Ren, Yanzeng

doi:10.1016/j.ceramint.2022.07.082

Cited by 22 publications

(3 citation statements)

References 43 publications

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“…The reduction in the Na1s peak in the SBC‐N after adsorption shows that ion exchange between NH 4 + ‐N and Na + takes place throughout the adsorption process (Ma et al, 2022). The enhancement of the N1s peak after adsorption indicates that N has been efficiently adsorbed on ceramsite (Yin & Kong, 2014).…”

Section: Resultsmentioning

confidence: 99%

Adsorption of nitrogen and phosphorus from wastewater by modified sludge/biomass ash ceramsite: Preparation, adsorption mechanism, and sustainable analysis

Shen

Zhou

et al. 2023

Water Environment Research

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Excessive ammonium and phosphate in aquatic settings may produce major eutrophication. Adsorbents can be used to reduce the eutrophication of natural water bodies. In this study, a sustainable and efficient ceramic adsorbent (sludge/biomass ash ceramsite [SBC]) was prepared by using sludge and biomass ash with a weight ratio of 1:1; the sintering parameters were 1070°C for 15 min. The NH4+‐N and P adsorption capabilities were improved by utilizing 1 mol L−1 NaOH and 1.6 mol L−1 La(NO3)3·6H2O for modification. When the pH and duration were 7 and 1440 min, respectively, the maximum bending capacity of ammonia nitrogen and phosphorus was 3.2 and 2.1 mg g−1 at 308 K. The pseudo‐second‐order kinetic model better describes the adsorption dynamics of NH4+‐N and P, whereas the Langmuir model better describes the adsorption isotherm models of NH4+‐N and P. The adsorption mechanism of SBC‐NaOH on NH4+‐N is ion exchange between Na+ and NH4+, whereas the adsorption mechanism of SBC‐La on phosphorus is ion exchange and La3+ adsorption. SBC combines efficient wastewater purification with the reuse of solid waste. The findings gave rise to the possibility of recycling ceramics as a plant fertilizer with a delayed release in the future. Practitioner Points New ceramsite was made from sludge and biomass ash. NH4+‐N (3.2 mg g−1) and P (2.1 mg g−1) were effectively adsorbed by ceramsite. The mechanism of NH4+‐N and P adsorption by ceramsite was studied. Absorbed ceramsite can be used as slow‐release fertilizer in plant cultivation.

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Section: Resultsmentioning

confidence: 99%

Adsorption of nitrogen and phosphorus from wastewater by modified sludge/biomass ash ceramsite: Preparation, adsorption mechanism, and sustainable analysis

Shen

Zhou

et al. 2023

Water Environment Research

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“…Various solid waste materials, such as slag, FA, MK, red mud, RHA, and among others, have been successfully used to produce sludge‐based geopolymers 10–14 . Sludge, which contains a large amount of silica‐aluminates, is also proved to be an excellent source for the production of geopolymer materials 13,28 . This review article aims to explore the properties of sludge‐based geopolymers and comprehensively analyze the influential factors related to their performance, which will be elaborated on in subsequent sections.…”

Section: Geopolymerization Processmentioning

confidence: 99%

Sludge‐based geopolymer materials: A review

Kong,

Shi,

Shen

et al. 2024

Int J Applied Ceramic Tech

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Sludge refers to the solid waste produced after sewage treatment. Unreasonable disposal of sludge can cause environmental pollution. Nonetheless, the sludge contains large amounts of silica‐aluminate, which has pozzolanic activity by treatment, and the sludge can be used as a sustainable building material. The previous studies have recommended that it is reasonable to produce geopolymers, that is, a green low‐carbon cementitious material with excellent mechanical and durability properties, from sludge. This article provides an overview of recent advancements in the study of sludge‐based geopolymer. It delves into the mechanisms behind alkali‐activated geopolymer, examines the feasibility of preparing geopolymer from sludge, and discusses various preparation methods. Additionally, it elaborates on the impact of incorporating different auxiliary materials on sludge‐based geopolymer. The comprehensive performance of sludge‐based geopolymer, encompassing mechanical properties, durability, and setting time, is thoroughly summarized. An environmental assessment is conducted, evaluating heavy metal leaching and the lifecycle of sludge‐based geopolymer. Finally, we briefly discuss some problems in the current research and development trends in the future on sludge‐based geopolymer. The aim of this article is to provide comprehensive support and guidance for both the research and practical engineering applications of sludge‐based geopolymer.

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“…According to the elemental composition, they can be divided into two categories: high-calcium and low-aluminum raw materials, represented by slag and coal gangue, and high-aluminum and low-calcium raw materials, represented by metakaolin and activated sediment [10,11]. Among them, the factors affecting the uniaxial compressive strength of alkali-activated high-calcium materials are very complex, and a large number of studies have reached inconsistent conclusions [12][13][14]. Representatively, Nath et al found that when the high-calcium raw Materials 2022, 15, 8795 2 of 12 material slag was added to the fly ash-based polymer, the strength of the sample increased first and then decreased with the increase in the calcium content in the system [15].…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Study on the Factors Affecting the Mechanical Properties of Alkali-Activated Slag Materials

Zhang

et al. 2022

Materials

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Blast furnace slag is one of the largest solid wastes in the world. The slag-based geopolymer obtained by alkali activation has many advantages, such as a high strength, a good corrosion resistance, low carbon and environmental protection. Existing studies have shown that the mechanical properties of slag-based geopolymers are related to the combined effects of many factors, but there is still a lack of reliable conclusions on the primary and secondary influence degree of each factor, which greatly affects the scientific preparation and application of slag-based geopolymers. In order to solve this problem, we choose to proceed from the two perspectives of the mix ratio of the alkali activator and the elemental composition of raw materials. Through the orthogonal analysis method, this paper studies the influence of the modulus of the alkali activator, the solid-to-liquid ratio of the activator, the water–cement ratio and the metakaolin replacement rate on the uniaxial compressive strength of a slag-based geopolymer. The results show that when the solid–liquid ratio is about 0.25, the modulus of the alkali activator is 1.3~1.5, the water–cement ratio is about 0.4 and the samples with higher strength can be prepared. With the addition of metakaolin, a new gel phase NASH was formed in the system, which significantly promoted the late strength and toughness growth of the sample. The research results comprehensively analyze the influence of different factors on the mechanical properties of the slag-based geopolymer, which can provide a valuable reference for the engineering application of alkali-activated slag materials.

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Preparation of non-sintered sewage sludge based ceramsite by alkali-thermal activation and hydration mechanism

Cited by 22 publications

References 43 publications

Adsorption of nitrogen and phosphorus from wastewater by modified sludge/biomass ash ceramsite: Preparation, adsorption mechanism, and sustainable analysis

Adsorption of nitrogen and phosphorus from wastewater by modified sludge/biomass ash ceramsite: Preparation, adsorption mechanism, and sustainable analysis

Sludge‐based geopolymer materials: A review

Orthogonal Experimental Study on the Factors Affecting the Mechanical Properties of Alkali-Activated Slag Materials

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