Use of hydrocyclone and flotation column for reducing the volume of contaminated dredged material

2006 ◽  
Vol 53 (7) ◽  
pp. 151-157 ◽  
Author(s):  
K.H. Park ◽  
J.H. Lee ◽  
B.H. Bae ◽  
Y.H. Kim ◽  
Y.K. Choung
Keyword(s):  
Heavy Metals ◽  
Integrated Treatment ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Wash Water ◽  
Column Flotation ◽  
Preliminary Treatment ◽  
Primary Concern ◽  
Flotation Column ◽  
Transmission Oil

As sediment contamination problems have recently been raised in Korea, the need for technologies to clean contaminants in sediments has increased. Although the recalcitrant organic matters and heavy metals in the contaminated sediments are of primary concern, large amounts of sediment makes the removal of the contaminants in them more difficult. In this study, the performance of hydrocyclone and flotation column was tested to reduce the volume of contaminated dredged materials (CDMs) prior to treating recalcitrant matters, such as various organic chemicals and heavy metals, in an integrated treatment system. When hydrocyclone was operated with 10% (w/v) solids concentration of the feed slurry, the total solids of upflow products were 4 to 7% (w/v) when the inlet pressure was changed from 1.0 to 2.0 kg/cm2. The volume reduction ratio of CDMs by hydrocyclone was approximately 90% (v/v). When the upflow products in hydrocyclone was then spiked with automobile transmission oil and fed to the flotation column to see the performance of the column flotation on the volume reduction and the TPH removal, 44% of the TPHs in feed were removed at the tails and the volume reduction ratio of CDMs by column flotation was 18% at 200 L/min of wash water. The flotation column could be proposed as a potential preliminary treatment process of CDMs prior to subsequent biological treatments.

Manufacture of Non-Toxic Lava from Recovery of the Incineration Ash by Plasma Fusing Technology

2011 ◽  
Vol 194-196 ◽  
pp. 2365-2375
Author(s):  
Jai Houng Leu ◽  
Li Fong Wu ◽  
Ay Su
Keyword(s):  
Heavy Metals ◽  
Fly Ash ◽  
Dissolution Rate ◽  
Bottom Ash ◽  
Reduction Ratio ◽  
National Standards ◽  
Toxic Heavy Metals ◽  
Mixture Ratio ◽  
Sustainable Operation ◽  
The Stability

This research investigated and explored the overall technical and legal suggestions on mixed ash (bottom ash + fly ash) from the first BOT(built-operation then transfer) incineration plant in south Taoyuan of Taiwan, with the hope of serving as the reference for treating ash from urban refuse incinerator and making sustainable operation management policies in Taiwan. Both bottom ash and fly ash contain high-content harmful metals like lead, chrome, and cadmium, with the lead content exceeding standard value. Plasma fusing technology may effectively settle toxic heavy metals and reduce their dissolution rate. The results show that the increase in percentage of bottom ash could maintain post-fusing strength and produce solidification effect, but this reduced the stability of toxic heavy metals and raised their dissolution rate. Suitable mixture ratio of bottom ash and fly ash was 2:1, volume reduction ratio 0.349, and weight reduction ratio 0.4936. The mixture was fulvous and dense with gloss and adequate strength. The dissolution test of lava products complied with national standards, and they might be used for recycling aggregates and solidifying cement.

Ultrasound predictive criteria for short term benign thyroid nodular volume reduction after ultrasound guided radiofrequency ablation

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Khaled Fikry Tawfik Shehab ◽  
Ahmed Mohamed Hussein ◽  
Rasha Tolba Khattab
Keyword(s):  
Thyroid Nodules ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Body Sensation ◽  
Significant Difference ◽  
Noticeable Improvement ◽  
Us Findings ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid ◽  
Ultrasound Features

Abstract Purpose This study evaluates the outcome of patients complaining of compressive& cosmetic problems due to benign thyroid nodules after recieving RF ablation with correlation between some ultrasound features of the nodules and their shrinkage and volume reduction. Methods and material fifteen patients with benign thyroid nodules causing compressive symptoms (foreign body sensation,neck discomfort or pain) and cosmetic problems. Results A total of 15 patients were included with the age rangmg from 22-82 years old the mean was 52.73 years old (SD + 14.37).Among them 12 patients (800 0)were females and 3 patients(20%) were males. There was statistically significant difference between volume of nodules before the procedure with mean volume was 21.13±5.13 and I month after with mean volume I I .96±3.08 and 3 months after the procedure with mean volume 7.70±2.82 with noticeable improvement in nodules with peri and intranodular vascularity showing mean reduction ratio 69.88% after 3 months vs 59.93% and 64 12% of weak peripheral vascularity and intense intra-nodular vasculanty respectively as well as US structure with spongiform nodules showing mean reduction ratio 68.48% at 3 months vs 59.87% and 62.14% for solid &mixed nodules respectively.Mean symptoms and cosmetic score were significantly reduced. Conclusion: This study validated the efficacy and safety of RFA for treatment of benign thyroid nodules and showed correlation between shrinkage and some common US findings.

scholarly journals Sequestration of Heavy Metals From Coal Wash Water Using Biochar From Pyrolysis of Morula Shells

2021 ◽  
Vol 6 (1) ◽  
pp. em0173
Author(s):  
Tumeletso Lekgoba ◽  
Lame Elsie Othugile ◽  
Freeman Ntuli
Keyword(s):  
Heavy Metals ◽  
Wash Water

Production integrated treatment of textile wastewater by closing raw material cycles

2005 ◽  
Vol 52 (10-11) ◽  
pp. 299-307
Author(s):  
R. Krull
Keyword(s):  
Textile Wastewater ◽  
Development Project ◽  
Integrated Treatment ◽  
Raw Material ◽  
Municipal Sewage ◽  
Preliminary Treatment ◽  
Finishing Process ◽  
Material Cycles ◽  
Textile Finishing ◽  
Working Day

A method for the in-house treatment of partial wastewater flows and the recycling of treated process water into the textile finishing process was developed in order to recycle effluents from textile finishing industry and feed them back into the production process. The method is based on a two-stage biological anaerobic–aerobic process to split colouring wastewater agents and to degrade organic sub-stances contained in the water as well as a chemical stage to remove the remaining color of the water with the help of ozone. In the framework of a research and development project a demonstration plant for a treatment capacity of 1440m3 per working day was installed and started in a textile finishing company. At the plant, a wastewater flow and a recycling flow are treated separately in two different treatment lanes. Approximately 40% of the total wastewater flows, i.e. 576m3/d are treated in the wastewater lane, and a maximum of 60% of total wastewater, i.e. 864m3/d are treated in the recycling lane. Thanks to the preliminary treatment of wastewater flows, which are discharged into the municipal sewage works, a reduction of average COD levels in the sewage works effluents could be achieved.

scholarly journals Ultrasound-Guided Microwave Ablation for Benign Thyroid Nodules: A Retrospective Analysis of Safety and Efficacy Factors

2021 ◽  
Author(s):  
Baoying Xia ◽  
Boyang Yu ◽  
Xiaofei Wang ◽  
Yu Ma ◽  
Feng Liu ◽  
...  
Keyword(s):  
Microwave Ablation ◽  
Thyroid Nodules ◽  
Thyroid Volume ◽  
Serum Levels ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Invasive Technique ◽  
Ultrasound Guided ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid

Abstract ObjectiveMicrowave ablation (MWA) is a minimally invasive technique for the treatment of benign thyroid nodules. The purpose of this study was to evaluate the efficacy and safety of ultrasound-guided microwave ablation in the treatment of benign thyroid nodules, and to provide reference for future clinical work.MethodsThis study retrospectively analyzed the patients who received ultrasound-guided microwave ablation for benign thyroid nodules in our hospital from October 2018 to March 2020. A total of 214 patients were included in the study. We assessed thyroid volume changes (represented by volume reduction ratio VRR) , the serum levels of triiodide thyroid hormone (T3), thyroxine (T4) and thyrotropin (TSH) and complications after MWA treatment.ResultsThere were a total of 306 nodules in 214 patients, including 183 (85.51%) females and 31 (14.49%) males. The median diameter and volume of the nodule were 33mm and 8.01ml. The volume reduction ratio（VRR）at 1 month, 3 months, 6 months and 12 months were 40.79%, 60.37%, 74.59% and 85.60%, respectively.（P<0.05) In addition, initial nodular volume were the influencing factors of volume reduction ratio.ConclusionsUltrasound-guided MWA is effective and safe in the treatment of benign thyroid nodules. In addition, it has little damage to surrounding tissues and no effect on thyroid function. Especially for the initial small volume of nodules, treatment is better. Therefore, ultrasound-guided thyroid MWA can be used as one of the main clinical treatment methods for benign thyroid nodules.

scholarly journals Efficacy and Safety of Single-Session Radiofrequency Ablation in Treating Benign Thyroid Nodules: A Short-Term Prospective Cohort Study

2021 ◽  
Author(s):  
Bang Nguyen Van ◽  
Xuan Thi Nguyen ◽  
Hau Van Vy Nguyen ◽  
Thuy Hai Nguyen ◽  
Toan Dinh Nguyen ◽  
...  
Keyword(s):  
Success Rate ◽  
Thyroid Nodules ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Thyroid Function Tests ◽  
Short Term ◽  
Therapeutic Success ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid

Abstract Objective:The aims of this study are to evaluate the safety and efficacy of RFA in the treatment of benign thyroid nodule(s) and to find independent factors related to the volume reduction rate of the nodule(s).Materials and methods: This short-term prospective study from a single medical center was conducted on 93 benign thyroid nodules in 93 patients treated with RFA. Two basic techniques were used: the trans-isthmic approach, moving-shot technique. Clinical and ultrasonography examinations were performed at 1; 3 months follow-up after the treatment session. Primary outcomes included volume reduction ratio (VRR) at 1 month and 3 months follow-ups; Secondary outcomes were therapeutic success rate and complications. Multiple linear regression analysis was used to determine independent factors associated with VRR. Results: A final sample of 78 patients with 78 nodules, given participant rate 83.8%, (included 60 solid nodules, 16 predominantly cystic nodules, and 2 thyroid cysts) was followed for 3 months. The mean volume reduction ratio was 41.47% and 64.72% after 1 month and 3 months follow-ups, respectively. The therapeutic success rate was 30.8% at 1 month and 84.6% at 3-month follow-ups. Symptom score and cosmetic score improved significantly. There was no change in thyroid function tests. Two minor complications (transient voice change) were found. The only internal component of nodules significantly related to the VRR during the 3 months follow-up (b = 23.00; 95%CI (7.59 - 38.45)).Conclusion: RFA was demonstrated as a safe and effective option for benign thyroid nodules treatment. It can be used as an alternative treatment with encouraging results.

Development of Induction Melting System With Active Insulator for Radioactive Solid Waste

2003 ◽  
Author(s):  
Takeshi Matsumoto ◽  
Ichiro Kawaguchi ◽  
Ryo Chishiro ◽  
Motohiko Nishimura ◽  
Kazuki Kanai ◽  
...  
Keyword(s):  
Volume Ratio ◽  
High Volume ◽  
Full Scale ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Induction Melting ◽  
Metallic Materials ◽  
Medium Scale ◽  
Thermal Hydraulic Analysis ◽  
High Frequency Induction

The melting treatment is suitable for reducing the volume of the wastes because of the high volume reduction ratio (the volume reduction ratio is the initial volume to the volume after treatment). We have developed a new high-frequency induction melting system for the low-level radioactive miscellaneous solid wastes. The non-conductive ceramic canister and a heat loss compensator (Active insulator) were used in this new system. It is difficult to melt a large amount of the non-metallic materials with the canister. We solved this problem by using the active insulator, which was made of the conductive material. Melting performance confirmation tests were performed in the medium-scale melting system. Based on the result of the medium-scale melting test and multi-dimensional thermal-hydraulic analysis, the full-scale melting system was designed and constructed. We performed the melting tests using the full-scale melting system. the volume ratio of the non-metallic wastes at the re-solidification was more than 70%. Behavior of nuclides was also investigated with non-radioactive Co and Cs tracers. The residual ratio of Co and Cs were 97%, 58%, respectively.

Exploratory Study of Gold Recycle from the Tailing of All-Sliming Cyanidation CIP

2014 ◽  
Vol 878 ◽  
pp. 348-352
Author(s):  
Shuai Xing Shi ◽  
Deng Feng Han ◽  
Ming Tan ◽  
Qiang Li
Keyword(s):  
Organic Carbon ◽  
Negative Influence ◽  
Industrial Test ◽  
Gansu Province ◽  
Column Flotation ◽  
Flotation Process ◽  
Flotation Column ◽  
Metallic Mineral ◽  
Flotation Columns ◽  
Leaching Residue

Gold ore is processed by all-sliming cyanidation CIP (carbon in pulp) at a gold mine in Gansu province of China. The leaching residue (tailing) Au grade is about 0.52 g/t, which is much valuable to be recovered. Mineralogical analysis shows that the loss of gold in leaching residue is mainly organic carbon adsorption gold and inclusion gold, accounting for 45.55% and 54.45% respectively. The inclusion gold is mostly wrapped by gangue and metallic mineral separately, accounting for 35.56% and 18.89%. Excluding the gold in gangue, both the gold adsorbed by organic carbon and wrapped in metallic mineral could be recycled by flotation process. Study has been carried out for recovering gold in cyanide residue by solely column flotation apparatus. During the semi-industrial test, B and E type sparger were adopted in flotation columns to evaluate their influence on process performance. To further improve metallurgy technology the ultrasonic device was introduced into flotation column tank. The results showed that ultrasonic pretreatment is negative influence, and the E type sparger is better than B type sparger. The concentrate Au grade is up to 10.14g/t, and34.3% of Au lost in tailing was recovered while feed grade being 0.52g/t. The column flotation process was proven being a proper way to recycle gold from the tailing of all-sliming cyanidation CIP.

A Study of the Rejects Recovery in a Column Flotation

2005 ◽  
Vol 498-499 ◽  
pp. 278-284 ◽  
Author(s):  
M.S. Oliveira ◽  
D.R. Cioqueta ◽  
M. Sallum ◽  
R. Miro ◽  
R.C. Guimarães ◽  
...  
Keyword(s):  
Column Flotation ◽  
Flotation Process ◽  
Rational Use ◽  
Flotation Column ◽  
Different Types ◽  
Flotation Columns ◽  
Flotation Technique ◽  
Useful Life ◽  
Discontinuous Mode ◽  
Rice Oil

Performing of the flotation process in columns started in the year 1981. Since then, this new flotation technique became usual in many countries, including Brazil, where nowadays flotation columns are installed in plants for iron and phosphate ore concentration. Sees the need of a rational use of the phosphate of Barreiro, Araxá (MG), whose medium useful life is esteemed in 30 years, Federal University of Uberlândia in partnership with Bunge Fertilizers looks for in this work to develop conditions for use of the rejects of the flotation process. A laboratory flotation column was operated in discontinuous mode in order to examine the mixture of two different types of collectors, ore conditioning time and reagents dosages. Contents between 22 and 29 % P2O5 were obtained and Apatite recovery varied in the range of 18 to 58 wt %. The results shows that the use of mixture of the synthetic reagent KE and the rice oil soap provided an increase considerable in the selectivity of the concentrate.

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