Adding waste iron shavings in reactor to develop aerobic granular sludge and enhance removal of nitrogen and phosphorus

Pan, Zengrui; Guo, Tao; Sheng, Jianlong; Feng, Hongbo; Yan, Anqi; Li, Jun

doi:10.1016/j.jece.2021.106620

Cited by 20 publications

(5 citation statements)

References 44 publications

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“…With the reactor reaching the stable operation stage, the TP concentrations in the final effluent showed a significant decrease from 8.43 to 0.09 mg/L, with an average removal rate of 98.5%. It was speculated that the excellent removal rate of TP was related to the addition of waste iron shavings, which was confirmed by previous studies [ 17 , 18 ].…”

Section: Resultssupporting

confidence: 72%

“…The three-stage non-uniform distribution, and simultaneously two independent reflux pipelines (module 5–1 and module 7–3) can save the carbon sources of raw water, enhancing the removal of NO 3 − . Our previous study [ 18 ] has confirmed that the effect of iron shavings micro-electrolysis can produce Fe 2+ and Fe 3+ , which would combine with PO 4 3− to form Fe 3 (PO 4 ) 2 and FePO 4 precipitates, enhancing the removal of phosphorus. In addition, the morphology of fillers after use showed that a large number of microorganisms are attached to the surface of the fillers, which was conducive to the formation of anaerobic–anoxic and aerobic environments and the simultaneous removal of nitrogen and phosphorus.…”

Section: Resultsmentioning

confidence: 79%

“…Similarly, the surface of waste iron shavings would be gradually corroded under the effect of micro-electrolysis. It is time to replace waste iron shavings and loofah when the phosphorus and nitrogen removal performance is poor [ 18 ]. The replacement cycle of loofah and waste iron shavings is about 80 d in this study, while waste plastic shavings and polyurethane generally do not need to be replaced due to high wear resistance and strength [ 15 , 16 , 24 , 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…In addition, waste iron shavings are produced in the process of steel processing and utilization, which is an easily available scrap metal in the form of rolled flakes, with Fe 0 as the main component. Previous studies have confirmed that waste iron shavings have an excellent effect on phosphorus removal [ 17 , 18 ]. Loofah, an agricultural waste, is featured by its multi-layered fibrous network structure, making it an ideal microbial carrier.…”

Section: Introductionmentioning

confidence: 92%

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A Magic Filter Filled with Waste Plastic Shavings, Loofah, and Iron Shavings for Wastewater Treatment

Pan

Sheng

Qiu³

et al. 2022

Polymers

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Integrated sewage treatment equipment has been widely used, but the commonly used fillers for wastewater treatment are not suitable in rural areas due to their price and performance issues. In this study, an integrated magic filter filled with waste fillers was proposed and established for wastewater treatment. The filter was composed of functional modules and an equipment room, and the fillers in each module can be taken out separately and changed arbitrarily according to the needs of specific treatment conditions. The fillers used include waste plastic shavings, loofah, and waste iron shavings, generated during the processing of plastic, crop, and steel. At the same time, a 91 d experiment was performed for real wastewater treatment, and a satisfactory removal performance was obtained, with average removal rates of COD, TP, NH4+-N, TN, and SS being 83.3%, 89.6%, 93.8%, 74.7%, and 94.0%, respectively. Through microscope observation, a large number of microorganisms were attached to the surface of the fillers, which was conducive to the simultaneous removal of nitrogen and phosphorus. The micro-electrolysis of waste iron shavings can produce Fe2+ and Fe3+, which would combine with PO43− to form Fe3(PO4)2 and FePO4 precipitates, enhancing the removal of phosphorus. In addition, the filled fillers have an excellent physical filtering effect, which can reduce the effluent SS. The magic filter achieves both the recycling of wastes and the treatment of wastewater.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

See 2 more Smart Citations

A Magic Filter Filled with Waste Plastic Shavings, Loofah, and Iron Shavings for Wastewater Treatment

Pan

Sheng

Qiu³

et al. 2022

Polymers

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“…Many strategies have been revealed for aerobic sludge granulation. The short settling time exerts a selection pressure to retain sludge with good settling ability and wash-out of light flocculent biomass [ 19 , 20 ]. In addition, control of organic loading rates and the operation of feast-famine in substrates could be favorable for granulation [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Filamentous Bacteria and Stalked Ciliates for the Stable Structure of Aerobic Granular Sludge Treating Wastewater

Liang

Pan

Guo

et al. 2022

IJERPH

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Aerobic granular sludge (AGS) is a promising technology for wastewater treatment. AGS formation belongs to microbial self-aggregation. Investigation of the formation and stability of AGS is widely paid attention to, in particular the structure stability of large size granules. Two types of AGS were developed in two sequencing batch reactors fed by two different wastewaters, respectively. Through confocal laser scanning microscope (CLSM) and scanning electron microscopy (SEM), the structure and composition of granules were analyzed. Filamentous bacteria were observed in granules from synthetic wastewater reactor, while filamentous bacteria and stalked ciliates (Epistylis sp.) were simultaneously found in granules from domestic wastewater reactor. The analytic results show that filamentous bacteria and stalked ciliates acting as skeletons play important roles in the formation and stability of granules. With the bonding of extracellular polymeric substances (EPS), the filamentous bacteria and stalked ciliates could build bridges and frames to promote the aggregation of bacteria; these microorganisms could create a space grid structure around the surface layer of granules to enhance the strength of granules, and the remnants of the stalks could serve as supports to fix the steadiness of granules.

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Nitrogen removal performance and microbial characteristics during simultaneous chemical phosphorus removal process using Fe3+

Huang

Yao

et al. 2022

Bioresource Technology

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Adding waste iron shavings in reactor to develop aerobic granular sludge and enhance removal of nitrogen and phosphorus

Cited by 20 publications

References 44 publications

A Magic Filter Filled with Waste Plastic Shavings, Loofah, and Iron Shavings for Wastewater Treatment

A Magic Filter Filled with Waste Plastic Shavings, Loofah, and Iron Shavings for Wastewater Treatment

Filamentous Bacteria and Stalked Ciliates for the Stable Structure of Aerobic Granular Sludge Treating Wastewater

Nitrogen removal performance and microbial characteristics during simultaneous chemical phosphorus removal process using Fe3+

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