Bowlingmygind9440

The use of REE patterns as geochemical tracers confirmed the conservative behaviour of REE in the fluvial network, that is, they are not affected by the precipitation of mineral phases. Voruciclib CDK inhibitor The quantification of REE released from AMD sources to water bodies reveals that, although the highest concentrations occur during the DP, the main load of REE occurs during the WP, due to the highest discharges, with 6.62 kg/day of LREE, 1.12 kg/day of MREE, and 0.54 kg/day of HREE.Stormwater treatment areas (STAs) are an integral component of the Everglades restoration strategies to reduce phosphorus (P) loads from adjacent agricultural and urban areas. The overall objective of this study was to determine the forms and distribution of P in floc and soils along the flow-path of two parallel flow-ways (FWs) in STA-2 with emergent aquatic vegetation (EAV) and submerged aquatic vegetation (SAV), respectively, to assess their stability and potential for long term storage. In EAV high organic matter accretion supported low bulk density and high P concentrations in floc and soil, while high mineral matter accretion in SAV resulted in high bulk density and low P concentrations. Approximately 25-30% of the total P is identified as highly reactive P (HRP) pools, 50-60% in moderately reactive P (RP) forms, and 15-20% in the non-reactive P (NRP) pool. Within HRP and RP pools, a large proportion of P in the SAV areas was inorganic while organic P was more dominant in the EAV areas. Enrichment of total P (especially in HRP and RP pools) found in the upstream areas of both FWs resulted from the P loading into FWs over time, and the surplus P conditions can potentially support flux into the water column. In EAV FW, approximately 45% of the P retained was recovered in floc and RAS and remaining was possibly retained in the above and below ground biomass and incorporated into subsurface soils. In SAV FW, all of the P retained was recovered in floc and soils suggesting P retention in plants was not significant. For STAs to continue to function effectively and meet the desired outflow TP concentrations, management strategies should be aimed to promote P limiting conditions within the system to avoid release of P from floc and soils to water column and potential downstream transport.To test the effect of CN ratio on soil N2O production, N2O production rates and pathways associated with nitrification (AOA-amoA, AOB-amoA, fungal ITS rDNA, bacterial 16S rRNA), and denitrification-related (nirK, nirS, nosZ) genes were investigated in subtropical forest (SF) and cropland (SC) soil in China in a 30-day CN ratio manipulation. In addition, 24-hour CN ratio manipulation, including the addition of acetic acid, were conducted to verify the results observed in the 30-day experiment. After 30 days of manipulation, the N2O production rates (N2Ot) increased from 2.46 in CN23 treatment to 4.71 μg N kg-1 day-1 in CN 10 treatment in SF, while it decreased from 4.17 in CN23 treatment to 3.83 μg N kg-1 day-1 in CN10 treatment in SC. The results in 24-hour experiment were consistent with those in 30-day experiment, and the addition of acetic acid increased N2Ot in SC, but not in SF. Soil CN ratios and inorganic N (NH4+ + NO3-) concentrations influenced the contribution of denitrification to N2O production and the N2O production rate via denitrification. Soil AOA played a dominant role in autotrophic nitrification-derived N2O production, resulting in a high contribution of autotrophic nitrification under low pH. Therefore, pH instead of CN ratio, is a key parameter for evaluating autotrophic nitrification-derived N2O via AOA and AOB. Soil CN ratio was significantly and positively correlated with the contribution of heterotrophic nitrification to N2O production, while there was no significant correlation with the N2O production rate via heterotrophic nitrification. This is mainly because the responsible heterotrophs (i.e., fungi and bacteria) were negatively and positively correlated with CN ratio in SF and SC, respectively. Therefore, CN ratio is not a strong predictor of soil N2O production, the initial C or N content and composition of functional genes could provide key information in acidic soils after a 30-day artificial CN ratio manipulation.As the main solid waste disposal method in China, landfill sites are considerable sources of methane (CH4) and carbon dioxide (CO2). This study characterized the seasonal variation of CH4 and CO2 effluxes at a large and well-managed final covered landfill site in China. A three-year monitoring program was conducted. There were two different seasonal variation patterns for hotspot and non-hotspot' CH4 and CO2 effluxes. For non-hotspots, the CH4 and CO2 effluxes' seasonal variations were mainly affected by the seasonal change of the landfill's cover soil respiration activity, particularly the CH4 oxidation capability. CH4 had a higher efflux in winter; in other seasons, the CH4 efflux fluctuated around 0; the CO2 effluxes were (1) increased in spring and peaked in summer or early autumn; (2) then, they decreased to a minimum value in late autumn or early winter; and (3) fluctuated with the CH4 efflux in winter. The CH4 emissions in winter account for 60.4-84.4% of the all year outputs. For the hotspots', the CH4 and CO2 effluxes seasonal variations were mainly determined by the seasonal change of the landfill cover's soil gas permeability. The ratio of CH4 emissions in winter to the all year outputs range from 17.4 to 68.7%.Evaluating the sustainability of wastewater management alternatives is a challenging task. This paper proposes an innovative methodology to assess and compare the sustainability of four wastewater management alternatives a) centralised water resource recovery facility (WRRF) based on activated sludge (AS); b) centralised WRRF with membrane bioreactors (MBR); c) decentralised WRRFs with upflow anaerobic sludge blanket reactors and trickling filters; d) centralised-decentralised hybrid system. In doing so, a composite indicator embracing total annual equivalent costs, carbon emission intensity, eutrophication and resilience (based on robustness and rapidity metrics) was developed using the analytic hierarchy process (AHP) method. The results show that decentralised and hybrid systems contribute less to carbon emission and eutrophication because of energy and fertilizer harvest and with a trade-off of higher costs of 7-17% than the ones of AS and MBR. In addition, decentralised and hybrid systems are more resilient, contributing to lower environmental impacts facing natural disasters.