scholarly journals STUDY ON DIFFERENT FACTORS AFFECT COD REMOVAL CAPACITY OF HALANAEROBIUM LACRUISEI IN SALINE WASTEWATER

2020 ◽  
Vol 58 (5A) ◽  
pp. 180
Author(s):  
Nguyen Thuy Chung
Keyword(s):  
Culture Conditions ◽  
Laboratory Method ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Processing Plant ◽  
Saline Wastewater ◽  
Treatment Area ◽  
Removal Capacity ◽  
Number Of Factors ◽  
Environmental Requirements

This study evaluated a number of factors (including temperature, pH, salinity) affecting the growth of Halanaerobium lacruisei bacteria in order to reduce COD concentration in saline wastewater of a fish sauce processing plant. The results of the study showed that halophillic bacteria had good capacity of reducing COD concentration under specific conditions.Laboratory experiments with different bacterial culture conditions showed that 30°C, pH 7.0 and 6-7 % salinity is the optimal culturing condition for Halanaerobium lacruisei treating COD in wastewater. In the laboratory condition, COD treatment capacity in saline wastewater of this microorganism can be up to nearly 88% after 48 hours, ensuring that the effluent meets the environmental requirements. In pilot condition of culturing the bacteria (in plastic tank, stimulating the real condition), after 25 days, the COD removal decreased continously, 80% effectively compared with the inlet wastewater. The effluent treatment efficiency by a laboratory method meets the standard of type B wastewater specified in QCVN 40:2011/BTNMT. This study showed that Halanaerobium lacruisei can be usedeffectively to treat the COD parameter in saline wastewater which can be applied in industrial wastewater treatment area as well.

Therapeutic potential of intravenously administered human mesenchymal stromal cells

2011 ◽  
Vol 31 (04) ◽  
pp. 269-274 ◽  
Author(s):  
K. Kollar ◽  
E. Seifried ◽  
R. Henschler
Keyword(s):  
Stromal Cells ◽  
Progenitor Cell ◽  
Therapeutic Potential ◽  
Culture Conditions ◽  
Human Mesenchymal Stromal Cells ◽  
Progenitor Cell Population ◽  
Multipotent Progenitors ◽  
Number Of Factors ◽  
Tissue Recovery ◽  
Preclinical And Clinical Studies

SummaryMesenchymal stem cells (MSC) represent a stem and progenitor cell population that has been shown to promote tissue recovery in preclinical and clinical studies. The study of MSC migration following systemic infusion of exogenous MSC is difficult. The challenges facing these efforts are due to a number of factors, including defining culture conditions for MSC, the phenotype of cultured MSC, the differences observed between cultured MSC and freshly isolated MSC. However, even if, MSC populations consist of a mixture of stem and more committed multipotent progenitors, it remains probable that these cell populations are still useful in the clinic as discussed in this review.

Effect of pH on Advanced Treatment of Mid-Stage Pulping Effluent with Potassium Ferrate

2013 ◽  
Vol 781-784 ◽  
pp. 2146-2149
Author(s):  
Shan Hong Lan ◽  
Rui Chen ◽  
Ping Ma ◽  
Hui Xia Lan ◽  
Yong Dong Wang
Keyword(s):  
Removal Efficiency ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Advanced Treatment ◽  
Potassium Ferrate ◽  
Effect Of Ph ◽  
Cod Removal Efficiency ◽  
Effects Of Ph ◽  
Alkaline Conditions ◽  
The Stability

The effects of pH on the advanced treatment of mid-stage pulping effluent with potassium ferrate were studied. Firstly, the effect of pH on the stability of the potassium ferrate solution was studied, which indicated that potassium ferrate was more stable in alkaline conditions than in acidic and neutral conditions, and the most stability was achieved at pH of 9-10. Then the effect of pH on the mid-stage pulping effluent treatment with potassium ferrate showed that the oxidation increased firstly and then decreased with the increase of the pH. The best treatment efficiency was at pH=4, under which COD removal efficiency reached 40%. The flocculation experiment was conducted using Fe3+ produced by the oxidation reaction as flocculant and PAC as extra flocculant and PAM as coagulant aid. Effect of pH on the flocculation process was studied, which showed that the flocculation effect first increased and then decreased with pH increasing. When pH was 9, COD removal efficiency reached 60%. The final effluent of COD concentration was less than 60mg/L, which met the requirements from the national first-order discharge standard.

scholarly journals Efficiency of organic substance removal in a hybrid sand filter with horizontal flow

2017 ◽  
Vol 35 (1) ◽  
pp. 95-100
Author(s):  
Krzysztof Jóźwiakowski
Keyword(s):  
Organic Substance ◽  
Treatment Plant ◽  
Load Level ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Horizontal Flow ◽  
Treated Wastewater ◽  
Sand Filters ◽  
Sand Filter ◽  
Hydraulic Load

AbstractThe paper presents the results of the research about the efficiency of organic substance removal in a hybrid sand filter. The investigations were carried out on a model wastewater treatment plant consisting of a preliminary sedimentation tank and two sand filter with a horizontal flow of wastewater (aerobic and anaerobic beds). The efficiency of BOD5 and COD removal was analysed for different wastewater hydraulic load levels: 0.72; 1.08; 1.44 dm3·d−1. The best efficiency of BOD5 and COD removal was obtained when the hydraulic load level was 1.08 dm3·d−1, respectively 83.8 and 72.3%. The average values of BOD5 and COD in the treated wastewater were significantly higher than the values deemed acceptable by relevant regulations in Poland. Based on the studies in the analyzed case, it was found that, sand filters with horizontal flow, do not guarantee high effluent treatment effect of typical household wastewater. In order to obtain a better efficiency of organic substance removal in a hybrid sand filter wastewater need to be oxygenate before being carried to these systems.

scholarly journals Removal of Cr(III) From Water By Polyurethane Foam Incorporated With Green Liquor Dregs Waste

2021 ◽  
Author(s):  
Guilherme Pereira Schoeler ◽  
Thays França Afonso ◽  
Rafael de Avila Delucis ◽  
Benedict C Okeke ◽  
Robson Andreazza
Keyword(s):  
Polyurethane Foam ◽  
Expansion Method ◽  
Effluent Treatment ◽  
Free Expansion ◽  
Green Liquor ◽  
Removal Capacity ◽  
Green Liquor Dregs ◽  
Foam Composite ◽  
Treatment Facilities ◽  
Low Efficiency

Abstract Water bodies contaminated by heavy metals cause a series of severe environmental and health issues. Chromium compounds stand out as one of the main contaminants since they are widely used by several industries. The low efficiency of effluent treatment facilities and the expensive sanitation procedures needed to remove metals from the water lead to serious concerns about the water quality in Brazil. In this study, a rigid polyurethane foam incorporated with green liquor dregs waste was prepared by the free expansion method. The foam composite and its isolated phases were evaluated for removing Cr(III) from water. The isolated dregs removed 81.93% of the Cr(III), which yielded a removal capacity of 135.45 mg·g-1. Whereas, the foam composite displayed Cr(III) removal percentage and capacity of 36.15% and 58.50 mg·g-1, respectively. Results suggests that the hybrid material may be considered for selective removal and extraction of Cr(III) from contaminated water.

scholarly journals Testing the Capacity of Staphylococcus equorum for Calcium and Copper Removal through MICP Process

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 905
Author(s):  
Sebastián Sepúlveda ◽  
Carla Duarte-Nass ◽  
Mariella Rivas ◽  
Laura Azócar ◽  
Andrés Ramírez ◽  
...  
Keyword(s):  
Urease Activity ◽  
Culture Conditions ◽  
Copper Tolerance ◽  
Process Water ◽  
Copper Removal ◽  
Calcium Carbonate Precipitation ◽  
Mining Operations ◽  
Removal Capacity ◽  
Ammonia Complex ◽  
Staphylococcus Equorum

This research focused on the evaluation of the potential use of a soil-isolated bacteria, identified as Staphylococcus equorum, for microbial-induced calcite precipitation (MICP) and copper removal. Isolated bacteria were characterized considering growth rate, urease activity, calcium carbonate precipitation, copper tolerance as minimum inhibitory concentration (MIC) and copper precipitation. Results were compared with Sporosarcina pasteurii, which is considered a model bacteria strain for MICP processes. The results indicated that the S. equorum strain had lower urease activity, calcium removal capacity and copper tolerance than the S. pasteurii strain. However, the culture conditions tested in this study did not consider the halophilic feature of the S. equorum, which could make it a promising bacterial strain to be applied in process water from mining operations when seawater is used as process water. On the other hand, copper removal was insufficient when applying any of the bacteria strains evaluated, most likely due to the formation of a copper–ammonia complex. Thus, the implementation of S. equorum for copper removal needs to be further studied, considering the optimization of culture conditions, which may promote better performance when considering calcium, copper or other metals precipitation.

Upflow Anaerobic Filtration of a Sugar Containing Wastewater

1993 ◽  
Vol 28 (2) ◽  
pp. 125-134 ◽  
Author(s):  
M. A. Boller ◽  
J. Eugster
Keyword(s):  
Pore Space ◽  
Gas Production ◽  
Operating Conditions ◽  
Cod Removal ◽  
Process Conditions ◽  
Processing Plant ◽  
Biomass Distribution ◽  
Reactor Model ◽  
Design Considerations ◽  
Steady State Performance

Pretreatment of a sugar containing wastewater from a date processing plant was tested for COD removal in an anaerobic pilot filter over a period of eight months. The filter was operated in the upflow mode and randomly packed with a plastic pipe carrier material. Initial start and restart after a 6-week break, steady state performance on seven different COD load levels ranging from 1.6 to 25 kg COD/m3·d, and filter behavior during reactor acidification were observed. In all examined experimental cases, the anaerobic filter rapidly adapted (5-7 days) to new operating conditions, thus indicating its high process flexibility. Below COD loads of 20 kg COD/m3·d, a COD removal of 90% or more was achieved. The specific CH4 gas production was measured at 0.40 - 0.53 m3 CH4/kg COD removed, and the specific sludge production was quantified at 0.1 kg paniculate COD/kg COD removed throughout the experimental periods. Biomass distribution revealed that 60% was attached to the packing media and 40% was suspended in the pore space. Based on COD profiles along the filter height, conclusions on the reactor flow pattern could be drawn. With the help of a simple reactor model, the experimental results could be used to simulate other process conditions for design considerations.

scholarly journals Reduction of Chemical Oxygen Demand (COD) Effluent of Plastic Recycling Processing Plant using LD Slag

2019 ◽  
Vol 8 (4) ◽  
pp. 6750-6755
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Foam Fractionation ◽  
Processing Plant ◽  
Plastic Recycling ◽  
Ld Slag

In wastewater plastic recycling processing plant, commonly contain high chemical oxygen demand (COD) concentration. Coagulation-flocculation, adsorption and foam fractionation are the examples of treatment processes that can reduce COD concentration in wastewater. Steel slag can be used as an alternative to remove COD concentration of wastewater adsorption process. Linz-Donawitz (LD) slag can be obtained from steel manufacturing plant. LD slag also contains alkali oxides, porous characteristic, large surface area and contain an easy solid-liquid separation. This research is to study the percentage reduction of COD in wastewater using LD slag as adsorbent. This research will investigate the effect of particle size, dosage amount and contact time between LD slag and COD reduction. From the experiment, the highest percentage COD removal for particle size is 0.2mm, the dosage amount is 6 gram and the contact time is at 60 min. Comparison of COD removal by using coagulation -flocculation, adsorption using activated carbon and adsorption using LD slag processes was done. LD slag can reduce 2% higher of COD compared to activated carbon. LD slag should be invested more in wastewater treatment process.

scholarly journals Macroalgae and Activated Sludge Microbes in Treatment of Crepe Cotton Effluent

2019 ◽  
Vol 9 (2S2) ◽  
pp. 697-700
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Heat Insulation ◽  
Algal Species ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Textile Fabrics ◽  
Domestic Wastewater Treatment

Crepe cotton bandages (textile fabrics) are common household kit in the medical first aid boxes and are globally used in pharmaceutical and health care units to offer heat, insulation and support in many medical situations. Southern Tamilnadu comprises of more than 150 crepe bandage textile units and exports tonnes of crepe cottons. Many units are operated on continuous basis and therefore the amount of wastewater generated and its treatment is of critical importance. Unlike typical textile effluent, crepe cotton processing wastewater do not contain dyes, but significant proportions of caustic soda, soda ash, bleaching agents and COD. This paper discusses the effluent treatment of crepe cotton processing units using mixed cultures of macroalgae and activated sludge microbes. There are very few studies comparing the performance of activated sludge and macro algae in wastewater treatment. Fresh water macroalgae was collected from a nearby pond and activated sludge was collected from the aeration basin of domestic wastewater treatment plant. Crepe cotton processing effluent had significant concentrations of COD, TDS, TSS and was highly alkaline. The COD removal efficiency of about 73.8% and 99 % was obtained for macroalgae and activated sludge microbes respectively. COD removal was quick in activated sludge while macroalgae cultures took 144 h to remove 275 mg/L of COD. This study shows that activated sludge microbes are quick to adapt in uptake of organics from crepe cotton effluent when compared to macroalgal sp, further studies will provide insights on generating bioenergy from algal species grown in crepe cotton effluent for sustained plant operation.

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