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中国贵州省重金属污染赤泥处理试验研究

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中国贵州省重金属污染赤泥处理试验研究

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中国贵州省重金属污染赤泥处理试验研究

  1. 1. Registration No. 5839536 Abstract Dunton Environmental successfully utilised a mix design of Regener 8-19 heavy metal remediation solution (as the primary reagent), coupled with other reagents to treat the red mud sample. The solutions were added to the sample homogeneously and the trial was conducted under controlled conditions. All the samples were tested by ALS. The process significantly reduced the As, Cd, Cr, Cu, Pb, Ni, Zn and Al concentrations within the red mud sample, and achieved a 61.8% reduction rate within 9 months of product application. From this bench scale trial Dunton Environmental proved the capability of Regener8-19 to treat heavy metal contaminated red mud, subsequently reducing risk of heavy metal accumulation in crops and mitigate any potential impact to human health and the environment from this material. Regener 8-19 Technical Background Regener 8-19 is applied to soils that are contaminated with various heavy metals. The product acts to alter the chemical environment within the solid matrix, allowing the reduction of the heavy metals within the solid. Regener 8-19 is applied in a liquid or powder medium to the solid waste by a variety of mechanisms depending on the nature and composition of the soil or solid waste. On site, Regener 8-19 is mixed and distributed homogenously through the soil or solid waste via Dunton Environmental’s Soterion batching plant; Dunton Environmental’s Stabilisation Unit or Dunton Environmental’s Allu mixing process. Technical Case Study Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • info@duntonenvironmental.co.uk Bench Scale Trial of Heavy Metal Contaminated Red Mud Treatment from Guizhou Province, China
  2. 2. Registration No. 5839536 Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • info@duntonenvironmental.co.uk Technical Case Study Regener 8-19 comprises specific metal-binding polymers that interact with the contaminants designated for reduction. The chemical process involves the exchange of ions between the Regener 8-19 solution and the metals present within the solid matrix leading to the binding and immobilisation of the heavy metal contaminants. Project Background Red mud is primarily produced in the aluminium industry. When alumina is extracted from the aluminium ore, red mud is also produced as a by-product. On average, 1 ton of alumina production will generate 1 ~ 2 tons of red mud. The Guizhou Province has the second largest aluminium ore reserve in China with proven aluminium reserves of 413 million tons. Due to the presence of this aluminium reserve the aluminium manufacturing related industry is one of the pillar industries in Guizhou. For this reason, this heavy metal contaminated red mud has become a relatively significant environmental pollution factor in this province. Dunton’s technical team discovered a potential business opportunity after an official technical communication in November 2016. A bulk sample of red mud from a contaminated site was provided to Dunton to carry out a bench trial. Prior to the commencement of the bench scale trial, Dunton commissioned ALS to determine the initial heavy metal concentration of the red mud sample on 28th November 2016. Based on the results, Dunton created a mix design product to reduce the total concentration of the heavy metals within the red mud. Solution The Regener 8-19 based Re-agent 1 solution was used to treat the heavy metal contaminated red mud sample, the treatment occurred after baseline sample was obtained (on 28th of November 2016). The soil was then left for 8 days under controlled conditions to allow Re-agent 1 to react with heavy metals within the sample. Two samples were taken and sent to ALS for concentration degradation testing on 6th December 2016 and 15th March 2017, respectively. However, the degradation results showed an increase (rebound) in heavy metal concentration. For this reason another altered mix design product was created, Re-agent 2. This treatment solution was added to the red mud sample under a pre-calculated volume, and samples were taken on 24th April 2017, 12th May 2017 and 22th September 2017. Results
  3. 3. Registration No. 5839536 Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • info@duntonenvironmental.co.uk Technical Case StudyDuring each treatment, several samples were taken and tested by ALS, to determine the degradation of each heavy metal concentration within the red mud sample. The heavy metal concentration showed a rebound on use of Re-agent 1 but showed a significant reduction upon use of Re-agent 2. Degradation results and graphs are presented below: Rebound Rebound Rebound Rebound Rebound Rebound 0 100 200 300 400 500 600 700 28/11/2016 06/12/2016 15/03/2017 24/04/2017 12/05/2017 21/09/2017 CONCENTRATION(MG/KG) SAMPLE DATE As Cr Cu Pb Ni Zn Baseline 28/11/2016 06/12/2016 15/03/2017 24/04/2017 12/05/2017 21/09/2017 Arsenic mg/kg 598 23.3 314 69 51 47 85% Boron mg/kg 91.1 <1.0 156 163 274 158 - Cadmium mg/kg 0.2 <0.3 10.9 <0.3 3.1 <0.3 97% Chromium mg/kg 188 83.2 169 158 127 118 30% Copper mg/kg 79.1 61.3 87 84.3 106 66.4 24% Lead mg/kg 85.6 44.3 105 51.5 11.3 46.9 55% Nickel mg/kg 48.74 30.7 45.7 46.4 52.8 40.5 11% Selenium mg/kg 1.19 <0.5 <0.5 <0.5 <0.5 2.1 - Zinc mg/kg 51.1 40.2 134 90.7 182 85.5 36% Mercury mg/kg 0.079 <0.05 <0.05 <0.05 0.06 0.05 - Aluminum mg/kg 16.18 29600 38200 64000 28500 11300 70% Iron mg/kg 6.4 19900 37600 38200 27800 28900 23% Trial results of Red Mud Sample Heavy Metal Fraction Unit Sample Date Reduction Rate (wrt 15-03-2017 application) Re-agent 1 Re-agent 2 Figure 1 - As, Cr, Cu, Pb, Ni, Zn Concentration Vs Time Table 1 - Heavy metal concentration within samples.
  4. 4. Registration No. 5839536 Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • info@duntonenvironmental.co.uk Technical Case Study 0 10000 20000 30000 40000 50000 60000 70000 28/11/2016 06/12/2016 15/03/2017 24/04/2017 12/05/2017 21/09/2017 CONCENTRATION(MG/KG) SAMPLE DATE Al Fe 0 2 4 6 8 10 12 28/11/2016 06/12/2016 15/03/2017 24/04/2017 12/05/2017 21/09/2017 CONCENTRATION(MG/KG) SAMPLE DATE Cd Se Hg Figure 2 – Al and Fe Concentration Vs Time Figure 3 – Cd, Se and Hg Concentration Vs Time.
  5. 5. Registration No. 5839536 Registered Office: Unit 1, Tamebridge Industrial Estate, Aldridge Road, Perry Barr, Birmingham, B42 2TX www.duntonenvironmental.co.uk • info@duntonenvironmental.co.uk Technical Case Study Conclusion Application of the proposed Regener 8-19 based Re-agent 2 solution reached the target reduction of heavy metal concentrations. As a result of this trial, the Regener 8-19 product has proven its capability of significantly reducing total concentration of the heavy metal in contaminated red mud using a site-specific mix design. Since the trial testing was carried out on a small scale, it would be beneficial to undertake a large-scale on-site pilot project, to further demonstrate the effectiveness of the product and the ease in usage under normal earthworks processing site conditions.

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