Heavy metal impact on lipid production from oleaginous microorganism cultivated with wastewater sludge

2021 ◽  
pp. 126356
Author(s):  
Xiaolei Zhang ◽  
Lu Liu ◽  
Juan Peng ◽  
Fang Yuan ◽  
Ji Li ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Lipid Production ◽  
Wastewater Sludge ◽  
Oleaginous Microorganism ◽  
Metal Impact

STUDY OF THE POSSIBILITY OF USING MICROWAVE RADIATION FOR THE TREATMENT OF LIQUID MUNICIPAL WASTE

2018 ◽  
Vol 8 (1) ◽  
pp. 44-49
Author(s):  
Viktor I. KICHIGIN ◽  
Marina V. ZEMLYANOVA ◽  
Elena A. VYALKOVA
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Electromagnetic Radiation ◽  
Microwave Radiation ◽  
Wastewater Sludge ◽  
Municipal Waste ◽  
Capillary Suction ◽  
Metal Impurities ◽  
Fi Ltration

The article is devoted to the study of the infl uence of microwave electromagnetic radiation (UHF EMP) on the properties of sewage sludge. The possibility of using microwave radiation for their processing is shown. The results of experiments confi rming the positive eff ect of the process under study on the degree and speed of compaction of a mixture of precipitation and activated sludge, improvement of their moisture yield, an increase in the yield of heavy metal impurities in decanted water, a decrease in the specifi c resistance of fi ltration and capillary suction of the sediment, precipitation. A hypothesis is proposed for the eff ect of UHF EMP on wastewater sludge.

scholarly journals Potential of anaerobic co-digestion in improving the environmental quality of agro-textile wastewater sludge

2020 ◽  
Author(s):  
Jean G. Tapsoba ◽  
Hans C. Komakech ◽  
Johnson Odera Ouma
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Environmental Quality ◽  
Oxygen Demand ◽  
Wastewater Sludge ◽  
Effluent Treatment ◽  
Cow Dung ◽  
Biogas Yield ◽  
Textile Sludge

Abstract Sludge from textile effluent treatment plants (ETP) remains a challenge for many industries due to inefficient and limited waste management strategies. This study explores the potential of using anaerobic digestion (AD) to improve the environmental quality of textile ETP sludge. The AD of ETP sludge is affected by the low C/N ratio (3.7), heavy metal content, and toxicity. To improve the process, co-digestion of ETP sludge with different substrates (sewage sludge, cow dung, and sawdust) under mesophilic conditions (37 °C), followed by a thermochemical pretreatment was assessed. The results showed that anaerobic co-digestion of the textile sludge with the co-substrates is effective in reducing pollution load. It was found that organic matters degraded during the 30-day AD process. The chemical oxygen demand and biological oxygen demand reduction was in the range of 33.1–88.5% and 48.1–67.1%, respectively. Also, heavy metal (cadmium, lead, iron, and, mercury) concentration was slightly reduced after digestion. Maximal biogas yield was achieved from co-digestion of textile sludge and sewage sludge at a mixing ratio of 3:1, 1:1, and 1:3, and methane content was respectively 87.9%, 68.9%, and 69.5% of the gas composition. The results from this study show that co-digestion will not only reduce the environmental pollution and health risks from the textile industry but also recover useful energy.

scholarly journals ESTIMATION OF HEAVY METAL IMPACT ON THE PHOTOSYNTHETIC APPARATUS OF PLANTS

2020 ◽  
Vol 4 (80) ◽  
Author(s):  
Oleksii Krainiukov ◽  
◽  
Ivetta Krivicka ◽  
Yuliia Cherkashyna ◽  
◽  
...  
Keyword(s):  
Heavy Metal ◽  
Photosynthetic Apparatus ◽  
Metal Impact

scholarly journals Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

2020 ◽  
Author(s):  
Jiaxin Chen ◽  
Ji Li ◽  
Xiaolei Zhang ◽  
Zhaoyang Wu
Keyword(s):  
Lipid Content ◽  
Solid Phase ◽  
Lipid Production ◽  
Oxygen Demand ◽  
Rhodotorula Glutinis ◽  
Wastewater Sludge ◽  
Sludge Reduction ◽  
Acid Pretreatment ◽  
Sludge Management ◽  
Biological Sludge

Abstract Background: Converting wastewater sludge to lipid is considered as one of the best strategies of sludge management. The current problem of lipid production from wastewater sludge is the low yield (0.10-0.16 g lipid/g dry sludge) due to the low availability of easily uptaken materials (such as soluble monosaccharide and oligosaccharide) in sludge to oleaginous microorganism (Rhodotorula glutinis, Trichosporon oleaginosus, Lipomyces starkeyi). Pretreatments are efficient methods to improve sludge bioavailability. This study is aimed to achieve high lipid production from sludge and high sludge reduction. Results: In this study, it was observed that the soluble chemical oxygen demand (SCOD) had significantly increased after different pretreatment. The SCOD in the supernatant was increased from 32.64 to 180.25 mg/L, 924.16 mg/L, 1029.89mg/L and 3708.31 mg/L after acidic (pH 2 for 2 h), alkaline (pH 12 for 2 h), microwave irradiation (15 min with 5 min interval), and ultrasonication (30 min at 450 W and 20 kHz frequency with 5 s on and 2 s off mode) pretreatment, respectively. Pretreatments have also increased the release of total nitrogen (TN) and total phosphorus (TP) from solids. The sludge after different pretreatments were used as medium for lipid production, and the highest lipid content (36.67% g/g) was obtained in the fermentation with ultrasonication pretreatment sludge, and the sludge reduction was 63.10%. For other pretreatments, the lipid content and sludge reduction were 18.42% and 32.63% in acid pretreatment case, 21.08% and 36.44% in alkaline pretreatment case, and 26.31% and 43.03% in microwave pretreatment case, respectively.Conclusion: It was found that ultrasonication pretreatment was the most efficient way to increase the sludge biodegradability (SCOD) and to release TN and TP from solid phase to liquid phase. Pretreated sludge for lipid production achieved significant improvement in lipid yield and sludge reduction. Lipids produced from pretreated sludge were transesterified to biodiesel and the analysis showed that the biodiesel had a similar composition as commercial biodiesel. The study reveals that pretreatment on sludge is a promising method for enhancing biological sludge management efficiency.

Hybrid Process for Heavy Metal Removal from Wastewater Sludge

2005 ◽  
Vol 77 (4) ◽  
pp. 372-380 ◽  
Author(s):  
Patrick Drogui ◽  
Jean-François Blais ◽  
Guy Mercier
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Wastewater Sludge ◽  
Hybrid Process

Control of heavy metal emission from metal plating industry in a german river basin

1998 ◽  
Vol 38 (4-5) ◽  
pp. 121-129 ◽  
Author(s):  
Harro Bode
Keyword(s):  
Heavy Metal ◽  
Industrial Effluents ◽  
Wastewater Sludge ◽  
Industrial Emissions ◽  
Limit Values ◽  
Metal Plating ◽  
Receiving Waters ◽  
Agricultural Use ◽  
Heavy Metal Emissions

The introduction of clear limits for the indirect discharge of heavy metals in Germany has greatly reduced the emissions from metal plating industry. Despite the more than 500 metal plating workshops within the Ruhr catchment area the current requirements for water quality of riverwater are met in the Ruhr (even the German limit values for drinking water are met). Nevertheless the industrial emissions into the sewers are still above the permitted level and above what routine checks of the industrial effluents lead to believe. Thus with respect to the German wastewater sludge regulation half of the dry sludge solids must be excluded from agricultural use. The complete implementation of legal requirements by all workshops will further diminish the heavy metal emissions into wastewater sludge and receiving waters.

Heavy metal impact on bacterial biomass based on DNA analyses and uptake by wild plants in the abandoned copper mine soils

2009 ◽  
Vol 100 (17) ◽  
pp. 3831-3836 ◽  
Author(s):  
Zhaohui Guo ◽  
Mallavarapu Megharaj ◽  
Michael Beer ◽  
Hui Ming ◽  
Mohammad Mahmudur Rahman ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Bacterial Biomass ◽  
Wild Plants ◽  
Mine Soils ◽  
Copper Mine ◽  
Dna Analyses ◽  
Metal Impact

scholarly journals OBTAINING NICKEL-CONTAINING PIGMENTS FROM LIQUID WASTE GALVANIC PRODUCTION

2021 ◽  
Vol 2 ◽  
pp. 84-92
Author(s):  
Volha S. Zalyhina ◽  
◽  
Victoria I. Cheprasova ◽  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Liquid Waste ◽  
Wastewater Sludge ◽  
Nickel Plating ◽  
Galvanic Production ◽  
Carcinogenic Effects ◽  
Treatment Facilities ◽  
The Impact

Spent electrolytes from galvanic production are characterized by a high content of heavy metal ions, which significantly exceeds their content in natural ores. The paper shows the possibility of processing spent sulfate electrolytes from nickel plating of galvanic production to obtain pigments, which will stabilize the operation of treatment facilities, prevent the ingress of heavy metal ions into the environment, which have toxic, mutagenic and carcinogenic effects, reduce the volume of wastewater sludge formed, and also obtain a valuable commodity product that is currently being purchased abroad. The results of investigations of the coloristic characteristics of the obtained samples of pigments are presented, the effect of Fe (III) ions present in the spent electrolytes of nickel plating as a contaminant on the color characteristics and purity of the color of the obtained samples is investigated. The dependence of the color of the obtained samples on the content of Fe (III) ions in the spent electrolytes was established, which made it possible to establish the range of coloristic characteristics of pigments obtained from spent sulfate nickel-plating electrolytes (green, yellow, brown and black colors). The results of the research carried out will reduce the impact of galvanic production on the environment.

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