Effect of soda ash industry effluent on agarophytes, alginophytes and carrageenophyte of west coast of India

Jadeja, R.N.; Tewari, A.

doi:10.1016/j.jhazmat.2008.05.080

Cited by 12 publications

(5 citation statements)

References 48 publications

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“…The main mineral components of the FA are quartz and mullite, respectively, as shown in Figure 1a,b. The chemical compositions of the SR are mainly composed of CaCO 3 , CaSO 4 , and Ca(OH) 2 [7,26,27]. The agglomerates formed by the combination of CaCO 3 and other components can provide a skeleton effect.…”

Section: Test Materialsmentioning

confidence: 99%

Mechanical Properties and Dry–Wet Stability of Soda Residue Soil

Zhao,

Yang,

Liang

et al. 2023

Buildings

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To effectively utilize the effectively the solid waste-soda residue (SR) and fly ash (FA), a mixture of 70% SR, 20% FA, and 10% clay was formed to produce soda residue soil (SRS). By adding cement and/or lime, four different SRS proportions were prepared. The compaction properties, mechanical properties, and dry–wet stability. Furthermore, the mechanical mechanisms of SRS were explored, and the improvement effect and efficiency of cement and/or lime on the mechanical performance of SRS were analyzed. The results show that the SRS is lightweight and easy to compact and shape, which is conducive to construction. Compared to cement, lime has a greater impat on the compaction properties of SRS. The mechanical properties of SRS are enhanced after adding cement and/or lime; the unconfined compressive strength (UCS), California Bearing Ratio (CBR), and resilient modulus all increase significantly. The UCS, CBR, and resilient modulus of SRS with different proportions all increase with the increase of compaction degree; the CBR and resilient modulus can meet the requirements of the subgrade, and the UCS can meet the requirements of the base and sub-base. The contribution rate of cement per unit amount is better than that of lime to the mechanical performance of SRS. As dry–wet cycles increase, the dry–wet stability of SRS with different proportions first increases and then decreases, which is affected by hydration and dry–wet deterioration together, with a critical cycle number for the strength transition. The excellent mechanical performance of SRS benefits from the gradation and chemical action. The particles of SR, FA, and clay can complement each other and perform an interlocking action. Therefore, SRS has a good gradation and forms a dense and stable structure. Also, the chemical reactions between materials are very important. The cement and/or lime have a hydration and gelling effect, FA and clay participate in pozzolanic reactions, and SR and FA have certain alkali-activated effects.

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Section: Test Materialsmentioning

confidence: 99%

Mechanical Properties and Dry–Wet Stability of Soda Residue Soil

Zhao,

Yang,

Liang

et al. 2023

Buildings

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“…The lack of interest in these organisms can be well judged from the fact that not a single seaweed species has been included in the Red Data Book of Indian Plants [33]. The recent industrial development in the coastal states of India is already putting this neglected group of marine organisms in peril [34,35]. A recent study carried out by us has shown that the population of Enteromorpha ovata (Chlorophyta), occurring along the Gopnath coast, might need immediate conservation attention (authors' own observation).…”

Section: Estimates Of the Conservation Status Of Indian Seaweedsmentioning

confidence: 99%

Seaweed Biodiversity of India: Reviewing Current Knowledge to Identify Gaps, Challenges, and Opportunities

2019

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Seaweeds are a renewable marine resources and have not yet received considerable attention in the field of taxonomy in India as compared to their terrestrial counterparts, essentially due to the lack of awareness of their economic potential. Although the recent inventory from the Indian region documented the presence of approximately 865 seaweed taxa, of which only a few are taxonomically well characterized, more precise information still awaits with respect to microscopic and molecular examinations of many. Thus far, in terms of spatial extent, probably only a few of the total hospitable seaweed habitats have been explored, and large portions, including island territories and subtidal waters, remain virtually untouched. Surveying those may lead to the reporting of several taxa new to science. Furthermore, more focused efforts are required to understand the endemic and endangered taxa which have high conservation implications. Considering the unprecedented pressures seaweeds are facing, including coastal pollution and human-induced global warming, it is critical to reinforce our knowledge of seaweed biodiversity. In the present communication, we intended to address the status of seaweed biodiversity in India along with the gaps, challenges, and opportunities.

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“…Ammonia soda residue (ASR) is a type of by-product generated in the Solvay process of sodium carbonate manufacture [ 1 , 2 ]. The effluent of ASR produced in the distiller tower is characterized by high pH, large amounts of dissolved solids and abundant ammonia [ 3 ]. Typically, ASR contains high content of calcium chloride (CaCl 2 ) and sodium chloride (NaCl) because of the inefficient utilization of chloride (<5%).…”

Section: Introductionmentioning

confidence: 99%

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

et al. 2022

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Magnesium oxychloride cement (MOC), a type of special construction material, has drawn much research attention in solid waste utilization and environmental protection due to its eco-friendly production. Ammonia soda residue (ASR), a by-product generated from sodium carbonate manufacturing, is one of the industrial wastes that can be recycled in MOC systems. However, ASR exhibits adverse effects on the fresh performance and volume stability of MOC pastes. This paper aims at improving the properties of ASR-MOC by introducing fly ash (FA), solid waste from the power industry. Firstly, the roles of FA in MOC pastes are evaluated and analyzed. Then, three substitution ratios of FA (33.3%, 50% and 66.7% in weight) for ASR are designed for MOC pastes with 10% to 40% industrial wastes. Flowability, setting, strength and expansion of all mixtures were experimentally studied. Furthermore, X-ray diffraction (XRD) and scanning electron microscope (SEM) approaches were adopted to illustrate the microstructure changes. Results show that by adding different amounts of FA, the inferior flowability of MOC caused by ASR can be improved by 6–23%, the setting process can be prolonged by 30–55% and the expansion ratio can be reduced by 14–66%. The intensity of characteristic peaks of 5-phase and Mg(OH)2, together with the degrees of crystallization in XRD curves, well explain the strength variation and volume stability of ASR-MOC pastes. According to the regulation of relative specification, up to 20% of solid wastes in weight (10% FA + 10% ASR) can be consumed, contributing greatly to the greener sustainable development of construction materials.

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Effect of soda ash industry effluent on agarophytes, alginophytes and carrageenophyte of west coast of India

Cited by 12 publications

References 48 publications

Mechanical Properties and Dry–Wet Stability of Soda Residue Soil

Mechanical Properties and Dry–Wet Stability of Soda Residue Soil

Seaweed Biodiversity of India: Reviewing Current Knowledge to Identify Gaps, Challenges, and Opportunities

Eco-Sustainable Magnesium Oxychloride Cement Pastes Containing Waste Ammonia Soda Residue and Fly Ash

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