High-rate nitrification of saline wastewaters using fixed-bed reactors

Ramaswami, Sreenivasan; Uddin, Farooq Moin Jalal; Behrendt, Joachim; Otterpohl, Ralf

doi:10.1016/j.jenvman.2019.05.020

Cited by 20 publications

(6 citation statements)

References 42 publications

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“…The mean removal efficiency of NH 4 + -N ranged from 43.7 to 72.6% for the duration of the operation. Similar to the foregoing COD result, the NH 4 + -N removal efficiency gradually recovered in line with the microbial acclimation, and notably, with the increase in the injected NaCl, NO 2 − -N gradually accumulated up to 16.8 mg/L by the end of the operation [54]. Comparable to the study by Wan et al [53], in which the NaCl was increased up to 5% in a partial nitrification of NH 4 + -N, this finding seems attributable to the nitrite oxidizing bacteria (NOB), which are more susceptible to the inhibitory effects of salinity than the ammonia oxidizing bacteria (AOB).…”

Section: Reactor Performancesupporting

confidence: 79%

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Kim

Ahn

2019

Environmental Engineering Research

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This study investigated the biological treatment of high-salinity wastewater using aerobic granular sludge (AGS). The removal performance, AGS characteristics, and microbial community were examined under salinity conditions ranging from 0.5 to 3.0 wt.%. When the salinity was increased, the removal efficiency of the chemical oxygen demand did not change substantially. The mean removal efficiency of NH4+-N ranged from 43.7 to 72.6% during the operation period. As for the concentration of extracellular polymeric substances (EPS), the polysaccharide/protein (PS/PN) ratio increased from 0.37 to 0.57. The concentrations of the mixed liquor suspended solid (MLSS) and mixed liquor volatile suspended solid (MLVSS) were 4,560 and 3,170 mg/L, respectively, in the end phase, and the MLVSS/MLSS ratio decreased from 0.81 to 0.69. The sludge volume index (SVI30) decreased linearly from 88 to 58 mL/g. In the microbial community analysis, Nitrosomonas species accounted for 22.9% of the total bacteria in the initial phase, whereas Halomonas accounted for 43.2% in the end phase. Hence, the gradually increased salinity appears to facilitate the dominance of halophilic microorganisms in the long-term operation of an AGS-based biological treatment system and the stable retention of AGS.

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Section: Reactor Performancesupporting

confidence: 79%

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Kim

Ahn

2019

Environmental Engineering Research

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“…Other than those, most recent studies have also showed the enhanced removal efficiency of fixed‐bed reactor (FBR) equipped with nanofilters and with plastic media achieving ≥97% of removals of NH 4 + –N and anaerobic membrane bioreactors (AnMBR) removed 96% of NH 4 + –N from industrial effluents (Ramaswami et al, 2019; Zhao et al, 2020). Earlier also, combination of prefiltration followed by aerobic treatment with nanofiltration demonstrated a recovery of about 80% of salts wherein rest of the wastewater was subjected to anaerobic pretreatment system to recover sulfates and organic carbon content partially.…”

Section: Biological Treatment Technologiesmentioning

confidence: 99%

Current available treatment technologies for saline wastewater and land‐based treatment as an emerging environment‐friendly technology: A review

Marathe

Singh

Raghunathan

et al. 2021

Water Environment Research

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Different industrial activities such as agro‐food processing and manufacturing, leather manufacturing, and paper and pulp production generate highly saline wastewater. Direct discharge of saline wastewater has resulted in pollution of waterbodies by very high magnitudes. Consequently, an enormous number of pollutants such as heavy metals, salts, and organic matter are also released into the environment threatening the survival of human and biota. Saline wastewater also has significant effects on survival of plants, agricultural activities, and groundwater systems. Several treatments and disposal technologies are available for saline wastewater, but the selection of the most appropriate treatment and disposal technology still remains a major challenge with respect to the economic or technical constraints. Considering the sustainable management of saline wastewater, the present review is an attempt to compile the existing and emerging technologies for the treatment of saline wastewater. Among all the individual and hybrid technologies, land‐based treatment systems are proven to be the most efficient technologies considering the energy demands, economic, and treatment efficiencies. Likewise, new and sustainable technologies are the need of hour integrating both the treatment and management and the resource recovery factors along with the ultimate goal of the protection in terms of human health and environmental aspect. Practitioner points Physico‐chemical treatment technologies for saline wastewater. Combined/Hybrid technologies for the treatment of saline wastewater. Land‐based treatments as the environment friendly and sustainable method for saline wastewater treatment and disposal. Role of phytoremediation in land‐based treatment.

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“…These characteristics imply that nitrifying microorganisms would be the first ones affected by both events of biomass washout and accumulation of substrates, associated with the decrease of removal efficiencies, caused by salts presence. Nevertheless, data from previous studies show that the ammonia oxidation process can perform in a stable manner up to salt concentrations of 26-56 g NaCl/L when salinity is stepwise increased (Dahl et al, 1997;Panswad & Anan, 1999;Ramaswami et al, 2019;She et al, 2016;Vredenbregt et al, 1997). Gradual adaptation of nitrifying organisms (Panswad & Anan, 1999) or proliferation of salt-tolerant strains (Chen et al, 2003;Cortés-Lorenzo et al, 2015) were proposed as possible mechanisms to explain the stability of ammonia oxidation at high salt concentrations.…”

Section: Nitrogen Removalmentioning

confidence: 99%

Salinity effects on biological treatments

2021

Treatment and Valorisation of Saline Wastewater: Principles and Practice

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High salinity environments can cause the denaturation of microbial enzymes and the destruction of the cell structure. In order to withstand these effects, microorganisms are able to develop mechanisms to both maintain the osmotic pressure balance inside the cells with the bulk liquid and retain water. Organic matter and nitrogen can be removed from high salinity effluents by means of biological processes, once microorganisms are previously adapted to the salt presence, but phosphorus removal efficiency decreases notably under saline conditions, even applying long acclimation periods or using a marine inoculum. Sudden fluctuations of wastewater salt concentration are the worst scenario for biological treatment systems since they cause the loss of pollutant removal efficiency that cannot be avoided even using halophilic microorganisms.

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High-rate nitrification of saline wastewaters using fixed-bed reactors

Cited by 20 publications

References 42 publications

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

The effects of high salinity on nitrogen removal and the formation characteristics of aerobic granular sludge

Current available treatment technologies for saline wastewater and land‐based treatment as an emerging environment‐friendly technology: A review

Salinity effects on biological treatments

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