Oxidation of iron sulfide and surface-bound iron to regenerate granular ferric hydroxide for in-situ hydrogen sulfide control by persulfate, chlorine and peroxide

Yin, Ran; Fan, Chihhao; Sun, Jiasen; Shang, Chii

doi:10.1016/j.cej.2017.12.060

Cited by 39 publications

(15 citation statements)

References 43 publications

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“…92% of engineers who reported confidence in the scientific literature and our work (Q 2 ) were not surprised by the results. The reason is probably that our findings on phosphorus availability are in good agreement with the theoretical knowledge of iron and phosphorus biochemistry [23] and with the fact that farmers have already been complaining about the suspiciously low yields and the reported photos of crops suffering from phosphorus deficiency, even under increased phosphorus fertilization [31]. The high level of trust among engineers in general can also play a part [49].…”

Section: Resultssupporting

confidence: 74%

“…The second common way to express phosphorus availability for plant nutrition, the analysis of Pe, falls almost linearly at somewhere between a third and a quarter of the original values. Following the above, it can be considered as independently proven that phosphorus accessibility for plant nutrition after the incorporation of ferrous sludge from drink water clarification into both soil types confirmed the latest indications from biochemistry literature stating that the chemical nature of the ferric sludge locks phosphorus into ferric phosphates, making it not only worthless for plant nutrition, but even harmful to nutrient cycles in soil [23,26]. In addition, the same mechanisms were indirectly confirmed with analyses of barley phytomass production (Table 2).…”

Section: Resultssupporting

confidence: 58%

“…Feedback from engineers and the main directions of their thinking are represented in Figure 3. sludge locks phosphorus into ferric phosphates, making it not only worthless for plant nutrition, but even harmful to nutrient cycles in soil [23,26]. In addition, the same mechanisms were indirectly confirmed with analyses of barley phytomass production (Table 2).…”

Section: Resultsmentioning

confidence: 59%

“…The cheapest in history, aluminum chloride, is currently being banned worldwide since having been identified as one of the triggers of Alzheimer's disease and senile dementia [22]. The second cheapest, ferric hydroxide is that most frequently applied by water treatment engineers worldwide [23]. Because the cost associated with the disposal of the flocculation residue of the process (the ferric sludge) is some USD 200 ton −1 through landfill without transportation, this waste is being provided to farmers on the pretext that crops will be able to utilize the organic matter that has been coagulated from the surface water [24].…”

Section: Introductionmentioning

confidence: 99%

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Residues from Water Precipitation via Ferric Hydroxide Threaten Soil Fertility

et al. 2021

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From the moment it was first indicated that use of aluminum chloride during purification of drinking water might be one of the triggers of Alzheimer’s disease, it took only a few years to almost abandon this practice worldwide. Now, two years after the initial evidence was presented that the cheapest possible replacement for aluminum chloride (ferric hydroxide, better known as ferrous sludge) significantly threatens soil fertility, there is almost no action. A robust case study was conducted among European drinking water treatment plants. First, it is reported that some samples of ferrous sludge can reduce phosphorus availability by more than 70%. This creates a precondition for a significant reduction in fertility over a decade. Because the legislation usually responds to similar findings with great delay, the extent to which managers of drinking water treatment plants are willing to change process settings by themselves has also been assessed. The findings obtained allow us to expect that a long continuation of this hazardous practice can be expected, since managers of drinking water treatment plants show little willingness to switch from the ongoing questionable technology (harmful to nutrient cycles in soil) to environmentally favorable (though slightly more costly) solutions.

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Section: Resultssupporting

confidence: 74%

Section: Resultssupporting

confidence: 58%

Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Residues from Water Precipitation via Ferric Hydroxide Threaten Soil Fertility

et al. 2021

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“…Iron sulphide upon oxidation forms the sulphuric acid (Eqs. 1 and 2) [21], which might increase the acidity of groundwater. Another reason might be the contamination from acid mine drainage [22].…”

Section: Discussionmentioning

confidence: 99%

Assessment of groundwater quality and determination of hydrochemical evolution of groundwater in Shillong, Meghalaya (India)

Jain

Sharma²,

Singh³

2021

SN Appl. Sci.

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Deterioration of surface water quality in various parts of India due to increasing urbanization has led to the extensive usage of groundwater for various domestic and irrigation needs, thereby raising concerns over its quality. However, there are very few studies focussing over the issue of groundwater quality in North-Eastern region of India. In order to make an assessment of the quality of groundwater for drinking and irrigation purposes, this study was carried out in Shillong—the Capital City of Meghalaya State in North-East India during pre-monsoon and post-monsoon seasons of 2018. Standard sampling and analytical procedures were followed for groundwater quality assessment. Minimal variation was observed in the water quality of pre- and post-monsoon seasons. However, the study found that groundwater samples are having acidic pH and presence of nitrate is also reported. Some of the samples also showed the presence of mercury, nickel, and cadmium. The presence of these contaminants could be attributed to the industrial activities in the state. Overall, the groundwater quality was found suitable for drinking and irrigation purposes after conventional treatment. Hydrochemical studies further inferred that groundwater properties in the region are influenced by the rock weathering along with the atmospheric precipitation.

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Self‐Assembled Ultra‐Long Hybrid Nanowire Formed by Simple Mixing: An Untapped Feature of Peroxydisulfate

Xu,

Fu,

Wang

et al. 2024

Small

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Peroxydisulfate (PDS), a popular molecule that is able to oxidize organic compounds, is garnering attention across various disciplines of chemistry, materials, pharmaceuticals, environmental remediation, and sustainability. Methylene blue (MB) is a model pollutant that can be readily oxidized by PDS‐derived radicals. Unlike the conventional degradation process, here a reversible “dissolution‐precipitation” phenomenon is discovered, triggered by a simple mixing of PDS and MB, revealing a novel application of PDS in fabricating self‐assembled ultra‐long nanowires with MB. This phenomenon is unique to PDS and MB, different from the traditional salting out or self‐aggregation of dyes. Formation of nanowires facilitated by electrostatic interaction between S+ and O− moieties and π–π stacking is reversible, controlled by temperature and the solvent polarity. MB1‐PDS‐MB2 configuration (MB: PDS = 2:1) is theoretically predicted by density functional theory (DFT) calculations and further validated by stoichiometric ratios of carbon, sulfur, and nitrogen in the obtained precipitates (MBO). This untapped feature of PDS enables the development of colorimetric quantitative detection of PDS and sustainable dye recycling. Far more than those demonstrated cases, the potentialities of MBO as a nanomaterial merit further exploration.

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Oxidation of iron sulfide and surface-bound iron to regenerate granular ferric hydroxide for in-situ hydrogen sulfide control by persulfate, chlorine and peroxide

Cited by 39 publications

References 43 publications

Residues from Water Precipitation via Ferric Hydroxide Threaten Soil Fertility

Residues from Water Precipitation via Ferric Hydroxide Threaten Soil Fertility

Assessment of groundwater quality and determination of hydrochemical evolution of groundwater in Shillong, Meghalaya (India)

Self‐Assembled Ultra‐Long Hybrid Nanowire Formed by Simple Mixing: An Untapped Feature of Peroxydisulfate

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