Evaluating sulfuric acid reduction, substitution, and recovery to improve environmental performance and biogas productivity in rubber latex industry

Chaiprapat, Sumate; Wongchana, Sunsanee; Loykulnant, Surapich; Kongkaew, Chaveewan; Charnnok, Boonya

doi:10.1016/j.psep.2014.10.002

Cited by 28 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, 94.4% of total COD was removed by the OAS in 12 days of HRT. This COD removal efficiency was higher than that of other anaerobic treatment systems treating the wastewater from natural rubber processing using a combination of a rubber trap and biological treatment (Chaiprapat et al, 2015;Hatamoto et al, 2012;Boonsawang et al, 2008;Kanyarat and Smate, 2008;Anotai et al, 2006). Furthermore, the HRT of the OAS was shorter than that of the conventional lagoon system (Nguyen and Luong, 2012;Mohammadi et al, 2010).…”

Section: Microbial Community Analysismentioning

confidence: 75%

Greenhouse gas emissions from open-type anaerobic wastewater treatment system in natural rubber processing factory

Tanikawa

Syutsubo

Watari

et al. 2016

Journal of Cleaner Production

View full text Add to dashboard Cite

We evaluated greenhouse gases (GHGs) emissions from an open-type anaerobic system (OAS) treating ribbed smoked sheets (RSS) wastewater in a processing factory. The emitted biogas comprised 57.7%-60.8% methane, 14.5%-31.5% carbon dioxide, 10.8%-24.7% nitrogen, and 329-423 ppm of nitrous oxide. In the OAS, the chemical oxygen demand (COD) degraded as the methane emission rate increased from influent to effluent. Finally, 94.4% of the total COD was removed. More than 90% of the removed COD converted to methane. Methane emitted from the bottom and the wall surface of the OAS. Methane-producing bacteria was detected by a cloning analysis of the 16S rRNA gene. The predominant species differed depending on the degradation characteristics of the RSS wastewater in the OAS. The emission rate of methane and nitrous oxide ranged between 2.58 and 8.85 NL/(m 2 .hr) and between 0.074 and 0.410 NL/(m 2 /hr), respectively. Moreover, 0.153 t-CO 2eq of GHGs were emitted from 1 m 3 of RSS wastewater treatment. Nitrous oxide accounted for 65% of the total GHGs emissions because of its high global warming potential. Therefore, both nitrous oxide and methane that emitted from the treatment of wastewater from a natural rubber processing factory must be considered as significant contributors to the GHGs.

show abstract

Section: Microbial Community Analysismentioning

confidence: 75%

Greenhouse gas emissions from open-type anaerobic wastewater treatment system in natural rubber processing factory

Tanikawa

Syutsubo

Watari

et al. 2016

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…There is insufficient methane to react in the reforming to convert CH 4 to hydrogen when the CH 4 concentration was below 40% (equation (2)). Hence, a low voltage level was detected with high error levels.…”

Section: Resultsmentioning

confidence: 99%

“…Normally, the SOFC technology can produce the electricity (voltage level; e − ) by H 2 and O 2 , following H 2 + O 2− → H 2 O + 2e − and 1/2O 2 + e − → O 2− . Therefore, the biogas from factory can produce high voltage levels that occurred in the chemical reaction following equation (2):…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A novel micro-solid oxide fuel cell ( $$\upmu $$ μ -SOFC) for detecting methane content in biogas

et al. 2019

View full text Add to dashboard Cite

A novel micro-solid oxide fuel cell (µ-SOFC), with a rectangular saw-tooth shape, was designed with a 50 wt% BYCF + 50 wt% GDC 10 cathode and a 60 wt% NiO + 40 wt% GDC 10 anode deposited on a GDC 10 electrolyte substrate by the spray pyrolysis technique. µ-SOFC receives methane only (CH 4) as fuel gas from one side. The fuel gas was applied at a flow rate of 0.2 l min −1. The power density obtained was 1.0 µW at 800 • C. Voltage levels generated by the µ-SOFC at 40-99.99% CH 4 was highly accurate representing the quantity of CH 4. Low accuracy was observed at 10-30% of CH 4. Therefore, µ-SOFC is an application of SOFC technology to be a sensor for economically detecting CH 4 in a biogas system, while being capable of operating in humid conditions at high temperatures.

show abstract

“…However, using large quantities of H2SO4 (5-10 kg/t) may contaminate the environment, accelerate equipment corrosion, hasten collectordecomposition and increase production costs (Chaiprapat et al, 2015;Feng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Improved flotation of auriferous arsenopyrite by using a novel mixed collector in weakly alkaline pulp

Wang¹,

Zhao²,

Hui³

et al. 2020

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

The purpose of using a mixed collector is to increase both flotation efficiency and selectivity. The mixed collector of potassium isopentyldithiocarbonate and N-dodecyl mercaptan exhibits high efficiency for the flotation of auriferous arsenopyrite, and the 2:1 mixing mass ratio of potassium isopentyldithiocarbonate and N-dodecyl mercaptan is preferred. Batch flotation tests indicate that a concentrate with the grade of 47.58 g/Mg Au and the recovery of 86.45% Au is achieved by using the mixed potassium isopentyldithiocarbonate/N-dodecyl mercaptan in weakly alkaline pulp. The collector mixture potassium isopentyldithiocarbonate + N-dodecyl mercaptan has greater adsorption density on the arsenopyrite surface than other conventional mixed collectors. The mixed potassium isopentyldithiocarbonate/N-dodecyl mercaptan can adsorb onto the arsenopyrite surface by intense chemisorptions, and the Sulfur-Iron chemical complexation is considered as the main adsorption mode. This is the reason why mixed potassium isopentyldithiocarbonate and N-dodecyl mercaptan collector can improve the flotation efficiency of auriferous sulfides.

show abstract

Evaluating sulfuric acid reduction, substitution, and recovery to improve environmental performance and biogas productivity in rubber latex industry

Cited by 28 publications

References 8 publications

Greenhouse gas emissions from open-type anaerobic wastewater treatment system in natural rubber processing factory

Greenhouse gas emissions from open-type anaerobic wastewater treatment system in natural rubber processing factory

A novel micro-solid oxide fuel cell ( $$\upmu $$ μ -SOFC) for detecting methane content in biogas

Improved flotation of auriferous arsenopyrite by using a novel mixed collector in weakly alkaline pulp

Contact Info

Product

Resources

About