Enzymes

doi:10.1002/9780470473412.ch7

Cited by 1 publication

(2 citation statements)

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“…The Km value provides insights about how quickly the adsorbent (SPS) reacts with the substrate (phosphate) while also considering the amount needed to be saturated (Mosier and Ladisch, 2009). Thus, lower Km values indicate that the SPS needs only small amounts of phosphate to achieve its maximum adsorption capacity, and higher Km values indicate the need for a higher concentration.…”

Section: Discussionmentioning

confidence: 99%

“…where Qe is the amount of SRP adsorbed at equilibrium (mg g -1 ), C0 is the initial concentration of SRP in solution (mg L -1 ), Ce is the concentration of SRP in solution at equilibrium (mg L -1 ), M is the adsorbent mass used (g) and V is the volume of SRP solution (Langmuir, 1918). To assess the reaction speed of each material the Michaelis-Menten constant (Km) was calculated, which is defined as the SRP concentration at half of the maximum adsorption capacity (qm) (Mosier and Ladisch, 2009):…”

Section: Srp Adsorption Experimentsmentioning

confidence: 99%

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From green to transparent waters : Managing eutrophication and cyanobacterial blooms by geo-engineering

Mucci

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Managing eutrophication remains a challenge to water managers. Currently, the manipulation of biogeochemical processes (i.e., geo-engineering) by using phosphorus-adsorptive techniques has been recognized as an appropriate tool to manage the problem. The first step in finding potential mitigating materials is conducting a sequence of upscaling studies that commence with controlled laboratory experiments. Here, the abilities of 10 possible solid-phase-sorbents (SPS) to adsorb P were examined. Four materials adsorbed P, and two of these materials were modified, i.e., a lanthanum-modified-bentonite (LMB) and an aluminummodified-zeolite (AMZ), and had the highest adsorption capacities of 11.4 and 8.9 mg P g-1 , respectively. Two natural materials, a red soil (RS) and a bauxite (BAU), were less efficient with adsorption capacities of 2.9 and 3.4 mg P g-1 , respectively. Elemental composition was not related to P adsorption. Since SPS might be affected by pH and redox status, we also tested these materials at pH values of 6, 7, 8 and 9 and under anoxic condition. All tested materials experienced decreased adsorption capacities under anoxic condition, with maximum adsorptions of 5.3 mg P g-1 for LMB, 5.9 mg P g-1 for AMZ, 0.2 mg P g-1 for RS and 0.2 mg P g-1 for BAU. All materials were able to adsorb P across the range of pH values that were tested. The maximum adsorption capacities of LMB and RS were highest at pH 6, AMZ was higher at a pH of 9 and BAU at a pH of 8. Thus, pH influenced P adsorption differently. Given the effects of pH and anoxia, other abiotic variables should also be considered. Considering the criteria that classify a useful SPS (i.e., effective, easy to produce, cheap and safe), only the two modified materials that were tested seem to be suitable for upscaling to enclosure studies with anoxic sediments.

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Section: Discussionmentioning

confidence: 99%

Section: Srp Adsorption Experimentsmentioning

confidence: 99%

From green to transparent waters : Managing eutrophication and cyanobacterial blooms by geo-engineering

Mucci

View full text Add to dashboard Cite

show abstract

Enzymes

Cited by 1 publication

References 43 publications

From green to transparent waters : Managing eutrophication and cyanobacterial blooms by geo-engineering

From green to transparent waters : Managing eutrophication and cyanobacterial blooms by geo-engineering

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