Effects of activated carbon on treatment of photo-processing waste by sulfur-oxidizing bacteria

1997 ◽  
Vol 35 (7) ◽  
pp. 187-195 ◽  
Author(s):  
Binle Lin ◽  
K. Futono ◽  
A. Yokoi ◽  
M. Hosomi ◽  
A. Murakami
Keyword(s):  
Activated Carbon ◽  
Treatment Effectiveness ◽  
Environmental Concern ◽  
Type Systems ◽  
Continuous Treatment ◽  
Processing Waste ◽  
Treatment Technology ◽  
Adsorption Effect ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

Establishing economic treatment technology for safe disposal of photo-processing waste (PW) has most recently become an urgent environmental concern. This paper describes a new biological treatment process for PW using sulfur-oxidizing bacteria (SOB) in conjunction with activated carbon (AC). Batch-type acclimation and adsorption experiments using SOB/PAC, SOB/PNAC, and SOB reactor type systems demonstrated that AC effectively adsorbs the toxic/refractory compounds which inhibit thiosulfate oxidization of SOB in PW. Thus, to further clarify the effect of AC, we performed a long-term (≈ 160 d) continuous-treatment experiment on 4- to 8-times dilution of PW using a SOB/GAC system which simulated a typical wastewater treatment system based on an aerobic activated sludge process that primarily uses acclimated SOB. The thiosulfate load and hydraulic retention time (HRT) were fixed during treatment such that they ranged from 0.8-3.7 kg S2O32-/l/d and 7.7-1.9 d, respectively. As expected, continuous treatment led to breakthrough of the adsorption effect of GAC. Renewing the GAC and continuing treatment for about 10 d demonstrated good treatment effectiveness.

A new treatment process for photo-processing waste using a sulfur-oxidizing bacteria/granular activated carbon system followed by Fenton oxidation

1998 ◽  
Vol 38 (4-5) ◽  
pp. 163-170 ◽  
Author(s):  
Binle Lin ◽  
R. Yamaguchi ◽  
M. Hosomi ◽  
A. Murakami
Keyword(s):  
Activated Carbon ◽  
Treatment Process ◽  
Ph Regulation ◽  
Removal Rate ◽  
Granular Activated Carbon ◽  
Fenton Oxidation ◽  
Continuous Treatment ◽  
Processing Waste ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

Establishing a treatment process for practical, economic disposal of photo-processing waste (PW) has become an urgent environmental concern under recently enacted provisions of the London Treaty. This paper describes a new, effective biological/chemical treatment process in which sulfur-oxidizing bacteria (SOB) is used in conjunction with granular activated carbon (GAC), i.e., an aerobic SOB/GAC system, to treat PW prior to Fenton oxidation. Weak dilution PW was treated in a long-term (98 d) continuous treatment such that mass-reduced sulfur compounds were completely oxidized to sulfate, while biodegradable organics in dissolved organic carbon (DOC) were simultaneously degraded at a removal rate of 55%. The remaining refractory/toxic compounds following aerobic SOB/GAC treatment were then effectively transformed to biodegradable organics without pH regulation by adding only 123-154 ml of 30% H2O2, whereas without aerobic SOB/GAC treatment, 670 ml (12% H2O2) was required. Under this innovative approach, DOC in PW was effectively degraded at a removal rate of about 95%, with the required amount of H2O2 being reduced by 77% and the occurrence of sudden boiling being completely removed.

scholarly journals The influence of active carbon contaminants on the ozonation mechanism interpretation

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lilla Fijołek ◽  
Joanna Świetlik ◽  
Marcin Frankowski
Keyword(s):  
Activated Carbon ◽  
Active Carbon ◽  
Alkali Metals ◽  
Activated Carbons ◽  
Carbon Surface ◽  
Bulk Solution ◽  
Ozone Decomposition ◽  
Reaction Products ◽  
Treatment Technology ◽  
Carbon Impurities

AbstractIn water treatment technology, activated carbons are used primarily as sorbents to remove organic impurities, mainly natural organic matter, but also as catalysts in the ozonation process. Commercially available activated carbons are usually contaminated with mineral substances, classified into two main groups: alkali metals (Ca, Na, K, Li, Mg) and multivalent metals (Al, Fe, Ti, Si). The presence of impurities on the carbon surface significantly affects the pHpzc values determined for raw and ozonated carbon as well as their acidity and alkalinity. The scale of the observed changes strongly depends on the pH of the ozonated system, which is related to the diffusion of impurities from the carbon to the solution. In an acidic environment (pH 2.5 in this work), the ozone molecule is relatively stable, yet active carbon causes its decomposition. This is the first report that indirectly indicates that contaminants on the surface of activated carbon (multivalent elements) contribute to the breakdown of ozone towards radicals, while the process of ozone decomposition by purified carbons does not follow the radical path in bulk solution. Carbon impurities also change the distribution of the reaction products formed by organic pollutants ozonation, which additionally confirms the radical process. The study showed that the use of unpurified activated carbon in the ozonation of succinic acid (SA) leads to the formation of a relatively large amount of oxalic acid (OA), which is a product of radical SA degradation. On the other hand, in solutions with purified carbon, the amount of OA generated is negligible.

scholarly journals Sulfur bacteria promote dissolution of authigenic carbonates at marine methane seeps

2021 ◽  
Author(s):  
Dalton J. Leprich ◽  
Beverly E. Flood ◽  
Peter R. Schroedl ◽  
Elizabeth Ricci ◽  
Jeffery J. Marlow ◽  
...  
Keyword(s):  
Carbonate Rocks ◽  
Sulfur Oxidation ◽  
Methane Seeps ◽  
Etch Pits ◽  
Active Dissolution ◽  
Authigenic Carbonates ◽  
Sulfur Bacteria ◽  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria

AbstractCarbonate rocks at marine methane seeps are commonly colonized by sulfur-oxidizing bacteria that co-occur with etch pits that suggest active dissolution. We show that sulfur-oxidizing bacteria are abundant on the surface of an exemplar seep carbonate collected from Del Mar East Methane Seep Field, USA. We then used bioreactors containing aragonite mineral coupons that simulate certain seep conditions to investigate plausible in situ rates of carbonate dissolution associated with sulfur-oxidizing bacteria. Bioreactors inoculated with a sulfur-oxidizing bacterial strain, Celeribacter baekdonensis LH4, growing on aragonite coupons induced dissolution rates in sulfidic, heterotrophic, and abiotic conditions of 1773.97 (±324.35), 152.81 (±123.27), and 272.99 (±249.96) μmol CaCO3 • cm−2 • yr−1, respectively. Steep gradients in pH were also measured within carbonate-attached biofilms using pH-sensitive fluorophores. Together, these results show that the production of acidic microenvironments in biofilms of sulfur-oxidizing bacteria are capable of dissolving carbonate rocks, even under well-buffered marine conditions. Our results support the hypothesis that authigenic carbonate rock dissolution driven by lithotrophic sulfur-oxidation constitutes a previously unknown carbon flux from the rock reservoir to the ocean and atmosphere.

Extracting copper and cobalt from non-ferrous residues by iron- and sulfur-oxidizing bacteria

2021 ◽  
Author(s):  
Jianxing Sun ◽  
Wenxian Liu ◽  
Ruichang Tang ◽  
Haina Cheng ◽  
Ronghui Liu ◽  
...  
Keyword(s):  
Sulfur Oxidizing ◽  
Sulfur Oxidizing Bacteria
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