biological oxidation Articles
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Homogeneous, heterogeneous and biological oxidation of iron(II) in rapid sand filtration
Homogeneous, heterogeneous and biological oxidation may precipitate iron(II) as iron(III) hydroxides. In this paper we evaluate the conditions under which each of these processes is dominant in rapid sand filtration (RSF). It is demonstrated that in the presence of iron(III) hydroxide precipitates homogeneous oxidation is negligible compared with heterogeneous oxidation. As soon as iron oxidizing ...
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Treatment of linear alkylbenzene sulfonate (LAS) wastewater by internal electrolysis – biological contact oxidation process
Surfactant wastewater is usually difficult to treat due to its toxicity and poor biodegradability. A separate physico-chemical or biochemical treatment method achieves a satisfactory effect with difficulty. In this study, treatment of the wastewater collected from a daily chemical plant by the combination processes of Fe/C internal electrolysis and biological contact oxidation was investigated. ...
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AOX removal from industrial wastewaters using advanced oxidation processes: assessment of a combined chemical–biological oxidation
In this paper, the abatement of adsorbable halogenated organic compounds (AOX) from an industrial wastewater containing relatively high chloride concentrations by a combined chemical and biological oxidation is assessed. For chemical oxidation, the O3/UV, H2O2/UV and photo-Fenton processes are evaluated on pilot scale. Biological oxidation is simulated in a 4 h respirometry experiment with ...
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FF System - Compact WWTP
Our “FF System” is the perfect solution created by our engineers to guarantee a flexible and long lasting treatment unit which is ready use due to the fact that it is completely pre-assembled. This compact system includes all the required unit operations such as screening, dissolved air flotation, biological oxidation, sedimentation and UV disinfection. This is the best available ...
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Remediation of polluted river water by biological contact oxidation process using two types of carriers
Biological contact oxidation technology was used to remediate the polluted river water in Hanyang, China. The purification effect of the polluted river water in three simulated rivers was investigated using two different carriers, i.e., AquaMats made in USA and semi flexible supports made in China. The results showed that when the hydraulic loading rate increased, purification effect in terms of ...
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An assessment of the toxicity of pyridinium chlorides and their biodegradation intermediates
Toxicity investigations were conducted for four pyridinium chlorides belonging to cationic surface-active substances (CSAS), which differed from each other in the numbers of methyl groups (CH(3)) in pyridinium ring. The crustacean Daphnia magna, the fish Lebistes reticulatus and the alga Scenedesmus quadricauda were chosen as biotests. Toxicity of examined preparations appeared to be very high ...
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Implementation and Evaluation of an Innovative Treatment of Xylenes and Naphthalene Using Oxidation and Biological Mechanisms
ABSTRACT: Subsequent to initial source area excavation and backfill, residual xylenes and naphthalene were treated via a biotic and abiotc approach. The remedial technology utilized free radical chemistry, oxidation chemistry and facultative biological oxidation. These processes extended the oxidant and free radical residuals while enhancing the in-situ environment for biologically based ...
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Comparison of PBDE congeners as inducers of oxidative stress in zebrafish
One of the proposed primary pathways through which PBDEs disrupt normal biological functions is oxidative stress. In this study, four PBDE congeners were evaluated for their potential to initiate oxidative stress in zebrafish during development: BDE 28, BDE 47, BDE 99, and BDE 100. N‐acetylcysteine (NAC) was used to increase intracellular GSH concentrations, and only decreased the effects of ...
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Contributions of homogeneous, heterogeneous and biological iron(II) oxidation in aeration and rapid sand filtration (RSF) in field sites
In groundwater treatment, after aeration, iron(II) is precipitated in rapid sand filtration (RSF) by homogeneous, heterogeneous and biological oxidation. The contribution of homogeneous iron(II) oxidation may be calculated from equations and constants available in the literature. Heterogeneous iron(II) oxidation produces hydrous ferric oxides coated filter sand, resulting in a growing filter ...
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Treatment of wastewater from a low-temperature carbonization process industry through biological and chemical oxidation processes for recycle/reuse: a case study
Low-temperature carbonization (LTC) of coal generates highly complex wastewater warranting stringent treatment. Developing a techno-economically viable treatment facility for such wastewaters is a challenging task. The paper discusses a case study pertaining to an existing non-performing effluent treatment plant (ETP). The existing ETP comprising an ammonia stripper followed by a single stage ...
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Novel application of bamboo-based fibers in a biological contact oxidation process
Generally, biofilm-supporting carriers in biological contact oxidation processes are made from thermoplastic polymers, which cause potential ecological damage because of the low biodegradation and high accumulation in organisms. Thus, four bamboo-based fibers, bamboo primitive fiber, bamboo fiber, bamboo charcoal fiber (BBF) and bamboo charcoal–cotton blending fiber (BCBF), were used as ...
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Biological active groundwater filters: exploiting natural diversity
In the Netherlands, biological trickling filters without chemical pre-oxidation are generally applied to treat anaerobic groundwater, containing methane, iron, ammonium and manganese. Previous research showed that all compounds can be removed in one filter step and that not only the ammonia oxidation (by nitrification), but also the iron oxidation is often a biological process, despite oxygen ...
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Manganese (Mn) toxicity to tropical freshwater species in low hardness water
Elevated Manganese (Mn) is a common contaminant issue for mine water discharges and previous studies have reported that its toxicity is ameliorated by H + , Ca2+ and Mg2+ ions. The toxicity of manganese (Mn) was assessed in a high risk scenario, i.e. the slightly acidic, soft waters of Magela Creek, Kakadu National Park, Northern Territory, Australia. Toxicity estimates were derived for six ...
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Evaluation of Ceralite-A as Ammonia Removal Biological Treatment Support Media - Case Study
Project Description A novel biological oxidation filtration treatment process was evaluated for removal of ammonia from a California groundwater source. In addition to ammonia, this groundwater had other contaminants such as iron, manganese, methane, hydrogen sulfide odor, color, high organic carbon, etc. As such, more conventional treatment processes such as breakpoint chlorination were deemed ...
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How Odor Control Systems Help Eliminate Odor Emitted from Different Plants
Odor is considered one type of air pollution that does not directly affect human health but can cause stress and reduce their quality of life. The foul odors originate from various industrial sources like fish, meat, food processing plant, sewage, domestic refuse processing plants, paint, paper pulp, chemical treatment plants, oil refineries, mist collectors, livestock processing facilities, ...
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Kinetics of aerobic oxidation of volatile sulfur compounds in wastewater and biofilm from sewers
Laboratory experiments were conducted to investigate the kinetics of aerobic chemical and biological oxidation of selected odorous volatile sulfur compounds (VSCs) by wastewater and biofilm from sewers. The VSCs included methyl mercaptan (MeSH), ethyl mercaptan (EtSH), dimethyl sulfide (DMS) and total inorganic sulfide, which have all been reported as the main constituents of foul sewer gas. ...
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Influence of nitrite on the removal of Mn(II) using pilot-scale biofilters
Two pilot-scale biofilters were used to systematically investigate the influence of nitrite on biological Mn(II) removal. Gibbs free energy change (ΔG) of the redox reaction between MnO2 and NO2– was 122.28 kJ mol–1 in 298 K, suggesting that MnO2 could not react with NO2–. When nitrite in the influent was increased from 0.05 to 0.5 mg L–1, manganese oxides did not react with nitrite in ...
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Nitrite and nitrate as electron acceptors for biological sulphide oxidation
Autotrophic denitrification with sulphide using nitrate (R1) and nitrite (R2) as electron acceptor was investigated at bench scale. Different solids retention times (SRT) (5 and 20 d) have been tested in R1 while R2 was operated at SRT = 13 d. The results indicated that the process allows complete sulphide removal to be achieved in all tested conditions. Tested sulphide loads were ...
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Combined technology for clomazone herbicide wastewater treatment: three-dimensional packed-bed electrochemical oxidation and biological contact degradation
The clomazone herbicide wastewater was treated using a combined technology composed of electrochemical catalytic oxidation and biological contact degradation. A new type of electrochemical reactor was fabricated and a Ti/SnO2 electrode was chosen as the anode in electrochemical-oxidation reactor and stainless steel as the cathode. Ceramic rings loaded with SnO2 were used as three-dimensional ...
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Characteristics and Classification of Buried Domestic Sewage Treatment Technology
The buried sewage treatment equipment is a modular high-efficiency biological sewage treatment equipment. It is a sewage biological treatment system with biofilm as the main body of purification. It makes full use of biofilm reactors such as anaerobic biofilter and contact oxidation bed. The characteristics of high biological density, strong pollution resistance, low power consumption, stable ...
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