Synthesis of amorphous-MnO/Clinoptilolite and its utilization for NH-N oxidation in an anoxic environment.

Mediating the anoxic ammonia oxidation with manganese oxide (MnO) can reduce the requirements of dissolved oxygen (DO) concentrations in constructed wetlands (CWs) and improve the removal of ammonium nitrogen (NH-N). Recent studies that employed natural manganese ore and/or mine waste as substrates in CWs may develop potentially negative environmental effects due to leachates. However, removing NH-N by anoxic ammonia oxidation is influenced by the crystal form of MnO.

Mn(VII) enhanced by CaSO to remove trace organic pollutants in high salt organic wastewater: Further enhancement of salinity.

The high concentration of salt in organic wastewater has a strong inhibitory effect on the removal of pollutants. A method for the efficient removal of trace pollutants in high-salinity organic wastewater was developed. This study investigated the effect of the combination of permanganate [Mn(VII)] and calcium sulfite [S(IV)] on pollutant removal in hypersaline wastewater.

Enhancing ammonia oxidation mediated using different crystalline Mn-oxides in an anoxic environment.

A recent study found that the nitrogen cycle in marine sediments can occur under oxygen-limited conditions, and this is associated with a reduction of Mn (IV). However, the effect of MnO mediated anoxic ammonia oxidation in different sediments field test results are controversial. In this study, based on the fact that the crystal form and morphology of MnO in marine sediments are affected by geochemistry, α-, β-, γ-MnO and amorphous MnO were prepared to explore the effect of the different MnO crystals on nitrogen removal under oxygen-limited conditions.

Denitrification performance and mechanism of denitrification biofilm reactor based on carbon-nitrate counter-diffusional.

This study researched denitrification performance and mechanism of denitrification biofilm reactor with different HRTs and carbon sources dosages. Experimental group (EG) had better nitrate and COD removal performance than control group (CG) with different HRTs or carbon doses, and the maximum nitrate-to-nitrite transformation ratio (NTR) of them reached 7.91 ± 1.

Education Moderates the Negative Effect of Apolipoprotein E ɛ4 on Response Inhibition in Older Adults.

Background: Studies have reported that apolipoprotein E epsilon 4 (APOE ɛ4) has adverse effects on executive functions (EFs) in late adulthood. However, the results have been inconsistent. Insufficient measurements of executive functioning, uncontrolled clinical and demographic confounders, and moderation effects from other environmental factors are suspected to account for the inconsistency.