scholarly journals Wastewater treatment from heavy metals using extracts of wood processing waste (oak bark)

2018 ◽  
Vol 451 ◽  
pp. 012221 ◽  
Author(s):  
T A Vasilenko ◽  
N Yu Kiryushina ◽  
A Yu Semeykin
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Processing Waste ◽  
Wood Processing

A novel Fe recycling method from pickling wastewater producing a KFeS2 whisker for electroplating wastewater treatment

2021 ◽  
Author(s):  
Dongxu Liang ◽  
Manhong Ji ◽  
Suiyi Zhu ◽  
Yu Chen ◽  
Zhihua Wang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Hydrothermal Method ◽  
Facile Hydrothermal Method ◽  
Electroplating Wastewater ◽  
Pickling Sludge

Pickling sludge was converted to a novel product of KFeS2 nanorods via a facile hydrothermal method that effectively removes heavy metals from electroplating wastewater.

PCDD/F, PAH and heavy metals in the sewage sludge from six wastewater treatment plants in Beijing, China

Chemosphere ◽  
2007 ◽  
Vol 66 (2) ◽  
pp. 353-361 ◽  
Author(s):  
Jiayin Dai ◽  
Muqi Xu ◽  
Jiping Chen ◽  
Xiangping Yang ◽  
Zhenshan Ke
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Beijing China

scholarly journals Microbial Flocculants as an Alternative to Synthetic Polymers for Wastewater Treatment: A Review

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 556 ◽  
Author(s):  
Faouzi Ben Rebah ◽  
Wissem Mnif ◽  
Saifeldin M. Siddeeg
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Suspended Solids ◽  
Specific Resistance ◽  
Oxygen Demand ◽  
Synthetic Polymers ◽  
Operating Parameters ◽  
Flocculating Activity ◽  
Microbial Strains ◽  
Active Substances

Microorganisms such as bacteria, fungi, and microalgae have been used to produce bioflocculants with various structures. These polymers are active substances that are biodegradable, environmentally harmless, and have flocculation characteristics. Most of the developed microbial bioflocculants displayed significant flocculating activity (FA > 70–90%) depending on the strain used and on the operating parameters. These biopolymers have been investigated and successfully used for wastewater depollution in the laboratory. In various cases, selected efficient microbial flocculants could reduce significantly suspended solids (SS), turbidity, chemical oxygen demand (COD), total nitrogen (Nt), dye, and heavy metals, with removal percentages exceeding 90% depending on the bioflocculating materials and on the wastewater characteristics. Moreover, bioflocculants showed acceptable results for sludge conditioning (accepted levels of dry solids, specific resistance to filtration, moisture, etc.) compared to chemicals. This paper explores various bioflocculants produced by numerous microbial strains. Their production procedures and flocculating performance will be included. Furthermore, their efficiency in the depollution of wastewater will be discussed.

scholarly journals Advances in Synthesis and Applications of Microalgal Nanoparticles for Wastewater Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Prashant Agarwal ◽  
Ritika Gupta ◽  
Neeraj Agarwal
Keyword(s):  
Heavy Metals ◽  
Energy Efficiency ◽  
Wastewater Treatment ◽  
Algae Biomass ◽  
Synthesis Of Nanoparticles ◽  
Microalgae Culture ◽  
Treatment Processes ◽  
Inorganic Substances ◽  
Treatment Technologies ◽  
Rapid Industrialization

Rapid industrialization, economic development, and population overgrowth are the major reasons responsible for the release of organic and inorganic substances into the environment, further leading to environmental pollution and contamination of water. Nowadays, it is truism that wastewater treatment has raised concern worldwide and is the need of the hour. Therefore, it is necessary to conserve sustainable energy and adopt advanced wastewater treatment technologies. Microalgae culture is gaining tremendous attention as it provides a combined benefit of treating wastewater as a growth medium and algae biomass production which can be used for several livestock purposes. Microalgae are ubiquitous and extremely diverse microorganisms which can accumulate toxic contaminants and heavy metals from wastewater, making them superior contender to become a powerful nanofactory. Furthermore, they are versatile, relatively convenient, and easy to handle, along with various other advantages such as synthesis can be performed at low temperature with greater energy efficiency, less toxicity, and low risk to the environment. Comparing with other organisms such as fungi, yeast, and bacteria, microalgae are equally important organisms in the synthesis of nanoparticles; therefore, the study of algae-mediated biosynthesis of nanometals can be taken towards a newer branch and it has been termed as phytonanotechnology. Here, an overview of recent advances in wastewater treatment processes through an amalgamation of nanoparticles and microalgae is provided.

scholarly journals Investigation of Some Qualitative Characteristics of Sludge Produced in Hamadan Wastewater Treatment Plant and Its Application in Agricultural Lands

2019 ◽  
Vol 6 (1) ◽  
pp. 1-7
Author(s):  
Reza Shokoohi ◽  
Samira Moradi ◽  
Zhila Ghavami ◽  
Azam Nadali ◽  
Raheleh Amiri
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Environmental Protection Agency ◽  
Treatment Plant ◽  
The United States ◽  
Average Concentration ◽  
Agricultural Lands ◽  
Secondary Sludge ◽  
Qualitative Characteristics

In this study, qualitative characteristics of the sludge produced in Hamadan wastewater treatment plant and the feasibility of its application in agricultural lands were investigated. Samples were taken from the primary and secondary sludge and indices such as VS/TS, PH, TKN, COD, TKN, SOUR, Na, Ca, SAR, heavy metals and biological properties (the mean fecal coliform count and the number of parasitic eggs) were measured. The results were compared with the United States Environmental Protection Agency (US EPA) standards (40 FCR-503). The results showed that the VS/TS ratio of the raw sludge was 0.8, 0.55, and 0.55 and that of the secondary sludge was 0.65, 0.28, and 0.32 for fall, winter, and summer, respectively. The average concentration of COD, TKN, SOUR, Na, and Ca for the initial sludge was 51283, 107, 0.50, 609, and 952 and for secondary sludge, it was 35595, 81, 4.90, 306, and 493 mg/L, respectively. The MPN for primary and secondary sludge was determined to be 19.83 × 106 and 186 × 106 , respectively and the average number of parasite eggs in primary and secondary sludge was 7.05 and 7.2 in 4 g of dry solids. Entamoeba coli had the highest number of parasite. The results of this study showed that the highest concentration of heavy metals in the sludge was 21396 mg/kg. The values obtained for the above-mentioned indices and heavy metals were in standards range. The results of this study show that none of the primary and secondary sludge samples has been properly stabilized. The values obtained for biological characteristics of sludge were not in the standard range. Therefore, it was revealed that the use of sludge for agriculture needed more stabilization.

scholarly journals The Influence of the Poles’ Lifestyle on the Quantity and Quality of Municipal Wastewater

2021 ◽  
Vol 31 (3) ◽  
pp. 265-275
Author(s):  
Ewelina Płuciennik-Koropczuk ◽  
Martyna Myszograj ◽  
Sylwia Myszograj
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Organic Compounds ◽  
Municipal Wastewater ◽  
Personal Care ◽  
Total N ◽  
Qualitative Characteristics ◽  
Total P ◽  
Wastewater Treatment Systems

Abstract The article presents lifestyle as an important factor determining the quantity and quality of municipal wastewater. The characteristic of wastewater in Poland has changed significantly in recent years. The qualitative characteristics of municipal wastewater indicate an increase of organic compounds and in the scope of micro-contaminants identified in them, e.g. nanoparticles, microplastics, pharmaceutical and personal care products or heavy metals. Therefore, the knowledge of parameters such as: BOD5, COD, total N, total P and suspension solids is no longer sufficient for the design and operation of wastewater treatment systems. Comprehensive research in this area is necessary to select those indicators that better describe the characteristics of wastewater.

scholarly journals EMISSIONS MONITORING OF HEAVY METALS AND THEIR COMPOUNDS RESULTED FROM COMBUSTION PROCESSES IN CLINKER KILNS IN ROMANIA

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
CRISTIAN CIOBANU ◽  
GHEORGHE VOICU ◽  
MAGDALENA – LAURA TOMA ◽  
PAULA TUDOR
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Contaminated Soil ◽  
Wastewater Treatment Plants ◽  
Raw Materials ◽  
Cement Plant ◽  
Combustion Gases ◽  
Waste Oils ◽  
Industrial Sources ◽  
Combustion Processes

<p>With the dust arising from the clinker kilns and grill coolers (the major pollution sources in a cement plant), also heavy metals and their compounds (in the form of powders and vaporous), originating from fuels and raw materials, are pumped into the air. The paper presents some aspects regarding the monitoring of heavy metals contained in the combustion gases from a Romanian cement factory. The fuels used in the incinerator varied from coal/petroleum coke, refuse oils (from waste oils and their emulsions, up to sludge, paraffin, tars, contaminated soil), rubber (including whole used tires), plastic, paper, leather, textiles, wood (including sawdust), as such or impregnated/contaminated with various substances from industrial sources or sorted household wastes, sludge (previously dried) from wastewater treatment plants. In addition, the list of over 100 types of waste that can be co-processed can be found in integrated authorizations of cement plants. However, the level of heavy metals in the combustion gases was in allowed limits.</p>

scholarly journals Use of Sewage Sludge in Agriculture

2011 ◽  
Vol 68 (2) ◽  
Author(s):  
Daniela CIUPEANU CĂLUGĂRU
Keyword(s):  
Waste Water ◽  
Heavy Metals ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Environmental Protection ◽  
Environmental Quality ◽  
Wastewater Treatment Plants ◽  
Biological Sludge ◽  
The Law ◽  
High Degree

For turning to a high degree of favorability of sludge from wastewater treatment plants, currently the reintroduction in the natural circuit of this waste is an urgent priority. Knowing precisely the composition of chemical and biological sludge from waste water in accordance with the law and the rules of their application, along with modern wastewater treatment appropriate technologies play a key role on environmental protection. Involvement by precise rules, the content of heavy metals in relation to the maximum permitted by law, translate in to particularly advantageous results in terms of environmental quality.

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