Sandia National Laboratories' work in solar detoxification of hazardous wastes

Alpert, D.; Sprung, J.L.; Pacheco, James E.; Prairie, M.R.; Reilly, Hugh E.; Milne, Thomas A.; Nimlos, Mark R.

doi:10.1016/0165-1633(91)90093-z

Cited by 36 publications

(9 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is a nearly closed system no vaporization of volatile compounds takes place. The size of the parabolic trough concentrator used in this study is even smaller when compared to the systems used by [8,9]. The temperature rise is also not very high (maximum 55–60°C) curtailing the need for any external cooling device.…”

Section: Methodsmentioning

confidence: 94%

Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

Singh

Chaudhary

Gandhi

2013

J Environ Health Sci Engineer

View full text Add to dashboard Cite

In the present study, solar photocatalytic oxidation has been investigated through laboratory experiments as an alternative to conventional secondary treatment for the organic content reduction of high COD wastewater. Experiments have been performed on synthetic high COD wastewater for solar photocatalytic oxidation using a parabolic trough reactor. Parameters affecting the oxidation of organics have been investigated.The experimental design followed the sequence of dark adsorption studies of organics, followed by photolytic studies (in absence of catalyst) and finally photocatalytic studies in presence and absence of additional oxidant (H2O2). All the experimental studies have been performed at pH values of 2, 4, 6,8,10 and the initial pH value of the wastewater (normal pH). For photocatalytic studies, TiO2 has been used as a photocatalyst. Optimization of catalyst dose, pH and H2O2 concentration has been done. Maximum reduction of organic content was observed at the normal pH value of the wastewater (pH = 6.8). The reaction rate was significantly enhanced in presence of hydrogen peroxide. The optimum pH other than the Normal was in the alkaline range. Acidic pH was not found to be favourable for organic content reduction. pH was found to be a dominant factor affecting reaction rate even in presence of H2O2 as an additional oxidant. Also, the solar detoxification process was effective in treating a waste with a COD level of more than 7500 mg/L, which is a otherwise a difficult waste to treat. It can therefore be used as a treatment step in the high organic wastewater treatment during the primary stage also as it effectively reduces the COD content by 86%.

show abstract

Section: Methodsmentioning

confidence: 94%

Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

Singh

Chaudhary

Gandhi

2013

J Environ Health Sci Engineer

View full text Add to dashboard Cite

show abstract

“…The size of the parabolic trough concentrator used in this study is even smaller when compared to the systems used so far. 24,25 The temperature rise is also not very high (maximum 55-60 C) curtailing the need for any external cooling device.…”

Section: B Experimental Set-upmentioning

confidence: 98%

Solar photocatalytic oxidation and disinfection of municipal wastewater using advanced oxidation processes based on pH, catalyst dose, and oxidant

Singh

Chaudhary

Gandhi

2013

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

There are great interests in photocatalytic oxidation of contaminants using advanced oxidation processes (AOP) based on photocatalytic oxidation in recent years. The main aim of the paper is to develop a method which takes care of energy and water conservation together. The study was performed on photocatalytic disinfection of total coliform (TC) bacteria as water microbial pollution and reducing the chemical oxygen demand (COD) as organic pollution index using catalytic and oxidant in present of sun light. The municipal wastewater was monitored for TC and in then was irradiated with solar light, solar light/TiO 2 , and solar light/TiO 2 /H 2 O 2 . Various parameters such as contact time, pH, and different concentration of TiO 2 and H 2 O 2 were studied for their effect on reaction process. The result showed that in presence of solar light, catalyst, and oxidant, very effective disinfection and reduction of TC and COD took place. 95.2% and 97% of TC and COD were reduced by irradiation for 240-300 min. Based on the results of various AOP combinations, Solar photolytic, solar/TiO 2 , Solar/TiO 2 /H 2 O 2 , the rate of COD, and TC removal was in the order of TiO 2 /H 2 O 2 > TiO 2 > Solar photolytic. It can be suggested as an effective treatment method for wastewater containing microbial and organic contamination.

show abstract

“…Examples include solar water heating [39], desalination [40,41], and water disinfection [42]. Considering the applications of PTC to wastewater purification, early examples consisted of solar thermal parabolic-trough collectors where wastewaters flowed in a borosilicate glass tube placed on the focal line [21,44]. Pyrex or Duran borosilicate glasses were chosen because of the necessity to have low levels of iron impurities.…”

Section: Parabolic Trough Collectors (Ptc)mentioning

confidence: 99%

“…With respect to PTCs, they offer the advantage of concentrating on the receiver all the radiation that arrives at the collector within a determined angle of acceptance, thus exploiting also part of the diffuse radiation. The concentration factor (CCPC) of a two dimensions CPC is related to the angle of acceptance, as per Equation (1): Considering the applications of PTC to wastewater purification, early examples consisted of solar thermal parabolic-trough collectors where wastewaters flowed in a borosilicate glass tube placed on the focal line [21,44]. Pyrex or Duran borosilicate glasses were chosen because of the necessity to have low levels of iron impurities.…”

Section: Compound Parabolic Collectors (Cpc)mentioning

confidence: 99%

Solar Concentration for Wastewaters Remediation: A Review of Materials and Technologies

et al. 2018

View full text Add to dashboard Cite

As the effectiveness of conventional wastewater treatment processes is increasingly challenged by the growth of industrial activities, a demand for low-cost and low-impact treatments is emerging. A possible solution is represented by systems coupling solar concentration technology with advanced oxidation processes (AOP). In this paper, a review of solar concentration technologies for wastewater remediation is presented, with a focus on photocatalyst materials used in this specific research context. Recent results, though mostly on model systems, open promising perspectives for the use of concentrated sunlight as the energy source powering AOPs. We identify (i) the development of photocatalyst materials capable of efficiently working with sunlight, and (ii) the transition to real wastewater investigation as the most critical issues to be addressed by research in the field.

show abstract

Sandia National Laboratories' work in solar detoxification of hazardous wastes

Cited by 36 publications

References 10 publications

Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

Solar photocatalytic oxidation and disinfection of municipal wastewater using advanced oxidation processes based on pH, catalyst dose, and oxidant

Solar Concentration for Wastewaters Remediation: A Review of Materials and Technologies

Contact Info

Product

Resources

About