Solidification/stabilization of heavy metals in latex modified portland cement matrices

1990 ◽  
Vol 24 (2-3) ◽  
pp. 225-230 ◽  
Author(s):  
S. Daniali
Keyword(s):  
Heavy Metals ◽  
Portland Cement ◽  
Cement Matrices

scholarly journals Performance of composite mineral adsorbents for removing Cu, Cd, and Pb ions from polluted water

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Woo-Ri Lim ◽  
Sung Wook Kim ◽  
Chang-Han Lee ◽  
Eun-Kyeong Choi ◽  
Myoung Hak Oh ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Adsorption Isotherm ◽  
Portland Cement ◽  
Weight Percent ◽  
Adsorption Kinetic ◽  
Polluted Water ◽  
Isotherm Models ◽  
Kinetic Experiment ◽  
Pb Ions ◽  
Mineral Adsorbents

Abstract This study evaluated the efficiency of the removal of heavy metals from contaminated water via adsorption isotherm and kinetic experiments on two composite mineral adsorbents, CMA1 and CMA2. The developed CMA1 (zeolite with clinoptilolite of over 20 weight percent and feldspar of ~10 percent, with Portland cement) and CMA2 (zeolite with feldspar of over 15 weight percent and ~9 percent clinoptilolite, with Portland cement) were applied to remove Cu, Cd, and Pb ions. Based on the adsorption isotherm and kinetic experiments, the adsorbents CMA1 and CMA2 exhibited high removal efficiency for Cu, Cd, and Pb ions in solution compared to other adsorbents. In the adsorption kinetic experiment, CMA2 demonstrated better adsorption than CMA1 with the same initial concentration and reaction time, and Cu, Cd, and Pb ions almost reached equilibrium within 180 min for both CMA1 and CMA2. The results of the adsorption kinetic experiments with pseudo-first-order (PFO) and pseudo-second-order (PSO) models indicated that the PSO model was more suitable than the PFO model. Comparing the Langmuir and Freundlich adsorption isotherm models, the former showed a very slightly higher correlation coefficient (r2) than the latter, indicating that the two models can both be applied to heavy metal solutions on a spherical monolayer surface with a weak heterogeneity of the surface. Additionally, the adsorbents CMA1 and CMA2 demonstrated different removal abilities depending on which heavy metals were used.

scholarly journals Stabilization/Solidification of used lubricating oil containing Fe and Pb with Portland cement and bentonite

2019 ◽  
Vol 276 ◽  
pp. 06011
Author(s):  
Ayu Nindyapuspa ◽  
Taty Alfiah ◽  
Virgo Indrawan Toda
Keyword(s):  
Heavy Metals ◽  
Waste Management ◽  
Portland Cement ◽  
Hazardous Waste ◽  
Government Regulation ◽  
Lubricating Oil ◽  
Hazardous Waste Management ◽  
Used Lubricating Oil ◽  
The Government ◽  
Pb Concentration

Used lubricating oil belong hazardous waste based on the Government Regulation Number 101 in 2014 about Hazardous Waste Management. Used lubricating oil contain hydrocarbon and heavy metals such as Fe and Pb. One of method to immobilize used lubricating oil is stabilization/solidification (S/S). S/S method always uses Portland cement to immobilize the heavy metals, but Portland cement can not immobilize the hydrocarbon. In this research, S/S method used Portland cement and bentonite are binding the heavy metals and hydrocarbon in the used lubricating oil. The composition used was cement bentonite 25:75, cement bentonite 75:25, cement 100%, and bentonite 100%. Used lubricating oil was added in 5%, 10%, and 15% weights. The S/S products were examined by measuring the TCLP of the Fe and Pb. The TCLP test was compared with the Fe and Pb concentration in the used lubricating oil. The results showed that the TCLP test of the Fe on the S/S product containing 5%, 10%, 15% used lubricating oil with cement 100% was 371.14 mg/L, 403.66 mg/L, and 417.89 mg/L respectively. Meanwhile, the Fe concentration in the used lubricating oil was 47.78 mg/L. The adding of bentonite to the S/S product decreased the Fe concentration that was leached. The TCLP test of the Fe in the S/S products that contained 5%, 10%, and 15% used lubricating oil with bentonite 100% were 15.24 mg/L, 0.085 mg/L, and 0.428 mg/L respectively. The S/S method using Portland cement and bentonite decreased the Pb concentration leached into the environment.

Alternative Remediation for Raw Petroleum Sludge by Using Solidification/stabilization Method

2021 ◽  
Vol 47 (2) ◽  
pp. 216-224
Author(s):  
Noorafizah Binti Murshid ◽  
Nor Amani Filzah Binti Mohd Kamil ◽  
Aeslina Abdul Kadir ◽  
Noor Faiza Binti Roslee ◽  
Abdul Rahim Jalil
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Portland Cement ◽  
Water Absorption ◽  
Ordinary Portland Cement ◽  
Regression Coefficient ◽  
Leaching Test ◽  
Stabilization Method ◽  
Petroleum Sludge ◽  
Leaching Behaviour

In Malaysia, the current practise in treatment of petroleum sludge (PS) is by using incineration and the ash produce required further treatment for safely disposal into landfill. This process require high cost and treatment of raw sludge by using solidification/stabilization method was introduce. In this study, ordinary Portland cement was used as binder. This study focuses on physical properties (compressive strength, density test and water absorption) of S/S matrices and leaching behaviour (SPLP). Results shows adds up to of 30% PS gives results on strength which comply with minimum landfill dispose limit. Correlation between strength and density in regression coefficient of 80.99% and correlation between strength and water absorption shows strong regression of 93.12%. Leaching behaviours on 28 th day of curing showed the similar trend as on 7th day of curing. All heavy metals concentration in leaching test were below the USEPA standard except for Nickel and Chromium. Even though these two metals were exceeded the standard, Portland cement was capable to encapsulate Ni and Cr in mixture and reduce the concentration of 87% and 69% (PS 40%), respectively, compare to concentration in raw sludge. As, conclusion S/S method can be an alternative disposal method for raw sludge.

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