scholarly journals Purification of Copper-Containing Wastewater in Inner-Cooling Oil Channel of Piston with Magnesium Hydroxide

2022 ◽  
Vol 2152 (1) ◽  
pp. 012045
Author(s):  
Lan Ma ◽  
Weijie Lian ◽  
Huiming Wu ◽  
Lijun Zhang ◽  
Yuxin Zhai
Keyword(s):  
Wastewater Treatment ◽  
Magnesium Hydroxide ◽  
Aquatic Ecosystem ◽  
Copper Ion ◽  
Excellent Performance ◽  
Emission Standards ◽  
Treatment Conditions ◽  
Stirring Time ◽  
Treatment Agent ◽  
Easy Operation

Abstract The treating fluid in the piston of inner-cooling oil channel is acid wastewater containing copper ion, it would adversely affect the aquatic ecosystem when emission directly. This paper use magnesium hydroxide as a wastewater treatment agent, to study the effect of magnesium hydroxide dose, stirring time, temerature on the results of treating fluid treatment, and get the best treatment conditions. The results indicate that magnesium hydroxide has an excellent performance including easy operation, super removing rate, supernatant can meet emission standards: c(Cu2+)≤2mg/L.

Improving the hydrobiological analysis of activated sludge at the Minsk wastewater treatment facilities

2021 ◽  
pp. 26-36
Author(s):  
О.С. Дубовик ◽  
Р.М. Маркевич ◽  
Е.В. Гаврилович ◽  
И.А. Гребенчикова ◽  
В.В. Иванович
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Point System ◽  
Treatment Conditions ◽  
Filamentous Microorganisms ◽  
Different Seasons ◽  
Treatment Facilities ◽  
Favorable Conditions ◽  
Quantitative Account ◽  
Different Levels

На основании накопленного опыта эксплуатации сооружений Минской очистной станции и обзора источников информации определена схема гидробиологического анализа активного ила, приведена форма регистрации результатов проведенного анализа. Для количественного учета нитчатых микроорганизмов разработана собственная пятибалльная система. Для нитчатых микроорганизмов, выявленных в активном иле, на основании анализа литературных данных определены условия, благоприятствующие их массовому развитию. В течение длительного периода времени, включающего разные сезоны года, проведена апробация усовершенствованной методики для мониторинга состояния иловой суспензии очистных сооружений двух площадок станции: классических четырехкоридорных аэротенков-вытеснителей первой площадки и биореакторов с каскадной денитрификацией второй площадки. Определены представители нитчатых микроорганизмов, постоянно обитающие в очистных сооружениях, выявлены доминирующие виды. Проведено сопоставление результатов анализа нитчатых форм и седиментационных характеристик активного ила. Сделаны заключения об особенностях биоценоза аэротенков первой площадки и биореакторов второй площадки, идентичности по видовому составу сообществ нитчатых бактерий, влиянии состава сточных вод и условий их очистки (нагрузка на ил, наличие зон с разным уровнем аэрации) на свойства иловой суспензии. Based on the accumulated experience in operating the Minsk Wastewater Treatment Facilities and a review of information sources, a scheme for the hydrobiological analysis of activated sludge was determined, and a form for recording the results of the analysis was provided. For the quantitative account of filamentous microorganisms, an original five-point system was developed. Based on the literature data analysis, favorable conditions for the mass growth of filamentous microorganisms found in activated sludge were determined. Over a long period of time, including different seasons of the year, the improved methodology was tested for monitoring the state of the sludge suspension at two sites of the treatment facilities: traditional four-line continuous-flow aeration tanks at the first site and bioreactors with cascade denitrification at the second site. The species of filamentous microorganisms, permanently living in wastewater treatment structures, have been identified, and the dominant species have been determined. The results of the analysis of filamentous forms and sedimentation characteristics of activated sludge are compared. Conclusions were made about the features of the biocenosis in the aeration tanks at the first site and in the bioreactors at the second site; about the identity of the species composition of the filamentous bacteria communities, the effect of the wastewater composition and treatment conditions (sludge load, occurrence of zones with different levels of aeration) on the properties of the sludge suspension.

scholarly journals Removal of toxic metals using ferrate(VI): a review

2019 ◽  
Vol 80 (7) ◽  
pp. 1213-1225
Author(s):  
Shuyu Dong ◽  
Yao Mu ◽  
Xuhui Sun
Keyword(s):  
Wastewater Treatment ◽  
Toxic Metals ◽  
Heavy Metal Contamination ◽  
Critical Issue ◽  
Effective Parameters ◽  
Complete Understanding ◽  
Treatment Agent ◽  
New Type ◽  
Environmental Decontamination ◽  
Further Development

Abstract Heavy metal contamination of water resources is a critical issue which adversely affects humans. Ferrate(VI) (FeVIO42−, Fe(VI)), as a new type of green multifunctional water treatment agent, has shown promising potential for environmental decontamination. A complete understanding of the interactions between ferrate(VI) and toxic metals can be conducive to the further development of ferrate(VI) technology for application to wastewater treatment. This review first introduces the purification of ferrate(VI) technology for toxic metals including free heavy metals and metal complexes briefly. The effective parameters are then analyzed and discussed in detail. Subsequently, the reactivity and mechanisms of ferrate(VI) with toxic metals are emphatically described. Finally, possible research challenges and directions for ferrate(VI) technology applied to wastewater treatment in the future are summarized.

A comprehensive approach for diagnosing opportunities for improving the performance of a WWTP

2016 ◽  
Vol 74 (12) ◽  
pp. 2935-2945 ◽  
Author(s):  
C. Silva ◽  
J. Saldanha Matos ◽  
M. J. Rosa
Keyword(s):  
Wastewater Treatment ◽  
Economic Performance ◽  
Wastewater Treatment Plants ◽  
Capacity Utilization ◽  
Energy Performance ◽  
Comprehensive Approach ◽  
Fecal Coliforms ◽  
Treated Wastewater ◽  
Oxidation Ditch ◽  
Excellent Performance

High quality services of wastewater treatment require a continuous assessment and improvement of the technical, environmental and economic performance. This paper demonstrates a comprehensive approach for benchmarking wastewater treatment plants (WWTPs), using performance indicators (PIs) and indices (PXs), in a ‘plan-do-check-act’ cycle routine driven by objectives. The performance objectives herein illustrated were to diagnose the effectiveness and energy performance of an oxidation ditch WWTP. The PI and PX results demonstrated an effective and reliable oxidation ditch (good–excellent performance), and a non-reliable UV disinfection (unsatisfactory–excellent performance) related with influent transmittance and total suspended solids. The energy performance increased with the treated wastewater volume and was unsatisfactory below 50% of plant capacity utilization. The oxidation ditch aeration performed unsatisfactorily and represented 38% of the plant energy consumption. The results allowed diagnosing opportunities for improving the energy and economic performance considering the influent flows, temperature and concentrations, and for levering the WWTP performance to acceptable–good effectiveness, reliability and energy efficiency. Regarding the plant reliability for fecal coliforms, improvement of UV lamp maintenance and optimization of the UV dose applied and microscreen recommissioning were suggested.

Controlled fabrication of ultrathin-shell BN hollow spheres with excellent performance in hydrogen storage and wastewater treatment

2012 ◽  
Vol 5 (5) ◽  
pp. 7072 ◽  
Author(s):  
Gang Lian ◽  
Xiao Zhang ◽  
Shunjie Zhang ◽  
Duo Liu ◽  
Deliang Cui ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Hydrogen Storage ◽  
Hollow Spheres ◽  
Excellent Performance

Practical Homemade Copper Filter by Banana Peels, Sand and Charcoal for Wastewater Treatment

2015 ◽  
Vol 804 ◽  
pp. 239-242
Author(s):  
Duongruitai Nicomrat ◽  
Jirasak Tharajak
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Environmental Problem ◽  
Copper Ions ◽  
Copper Ion ◽  
Filtration Efficiency ◽  
Agricultural Wastes ◽  
Toxic Heavy Metals ◽  
Extraction Period ◽  
Treatment Application

Copper ions are commonly contaminated in the effluents from many electronic factory. In copper filtration, most filter types are usually expensive and causes toxic residues and creates another health and environmental problem. Therefore, this research has been developed a copper filtration approach based on homemade non-hazardous residues of banana peels, unmeshed sand, and charcoal. The results showed that baked, minced banana peels media could absorb synthetic water having copper ion at 50 ppm with filtration efficiency of 70% within 2 hr. Baked minced banana peels in combination with sand and charcoal could adsorb Copper (II) at 50 mg/ mL more than 80%. However, the swollen structure of banana peels during copper (II) filtration caused limit filtration efficiency to 4-5 hour extraction period. The tentative wastewater treatment application is, therefore, the use of bio-adsorbent for effective adsorption of toxic heavy metals from effluents open discarded from agricultural wastes in the environment.

scholarly journals Imidazole Processing of Wheat Straw and Eucalyptus Residues—Comparison of Pre-Treatment Conditions and Their Influence on Enzymatic Hydrolysis

Molecules ◽  
2021 ◽  
Vol 26 (24) ◽  
pp. 7591
Author(s):  
Pedro M. A. Pereira ◽  
Joana R. Bernardo ◽  
Luisa Bivar Roseiro ◽  
Francisco Gírio ◽  
Rafał M. Łukasik
Keyword(s):  
Enzymatic Hydrolysis ◽  
Wheat Straw ◽  
Treatment Process ◽  
Lignin Content ◽  
Biomass Conversion ◽  
Treatment Conditions ◽  
Treatment Agent ◽  
Pre Treatment ◽  
Increasing Temperature ◽  
Temperature Time

Biomass pre-treatment is a key step in achieving the economic competitiveness of biomass conversion. In the present work, an imidazole pre-treatment process was performed and evaluated using wheat straw and eucalyptus residues as model feedstocks for agriculture and forest-origin biomasses, respectively. Results showed that imidazole is an efficient pre-treatment agent; however, better results were obtained for wheat straw due to the recalcitrant behavior of eucalyptus residues. The temperature had a stronger effect than time on wheat straw pre-treatment but at 160 °C and 4 h, similar results were obtained for cellulose and hemicellulose content from both biomasses (ca. 54% and 24%, respectively). Lignin content in the pre-treated solid was higher for eucalyptus residues (16% vs. 4%), as expected. Enzymatic hydrolysis, applied to both biomasses after different pre-treatments, revealed that results improved with increasing temperature/time for wheat straw. However, these conditions had no influence on the results for eucalyptus residues, with very low glucan to glucose enzymatic hydrolysis yield (93% for wheat straw vs. 40% for eucalyptus residues). Imidazole can therefore be considered as a suitable solvent for herbaceous biomass pre-treatment.

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