Effects of olive mill wastewater on soil carbon and nitrogen cycling

Tsiknia, Myrto; Tzanakakis, Vasileios Α.; Oikonomidis, Dimitris; Paranychianakis, Nikolaos V.; Nikolaidis, Nikolaos P.

doi:10.1007/s00253-013-5272-4

Cited by 69 publications

(38 citation statements)

References 42 publications

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“…The low levels of nitrates observed in this study support further this hypothesis. Similar result regarding nitrates is reported by a recent microcosm study attributing it to potential inhibition of nitrifying microorganisms by low mineral N availability, caused by increased inorganic N microbial immobilization, rather than toxicity [34]. With regard to P, it had also a remarkable reduction through soil infiltration due to adsorption and precipitation phenomena induced by the clay-rich and calcareous soil of the present study.…”

Section: Discussionsupporting

confidence: 91%

“…Despite the effective organic N mineralization NH4 + -N content in solution did not increase throughout the OMW application period. This is probably due to intense microbial immobilization caused by increased competition for N among soil microorganisms [34]. The low levels of nitrates observed in this study support further this hypothesis.…”

Section: Discussionsupporting

confidence: 80%

“…Moreover, these rates continued until late August probably following the decreasing trend of phenol concentration in the storage pond and the stimulated phenols biodegradation processes. Previous studies report changes in the composition of soil microorganisms [7,15,33] and enzymes activities [13,34] involved in phenol degradation, indicating that OMW may favor soil microorganisms and activities specialized to degradation of phenolic compounds. Similarly to our study, under field conditions, it has been reported significant reduction of phenols, described by a first order kinetics with the constant value (K) to range from −0.014 to −0.018 per day [3].…”

Section: Discussionmentioning

confidence: 98%

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Land Application-Based Olive Mill Wastewater Μanagement

Kapellakis

Tzanakakis²,

Angelakιs

2015

Water

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Land application of olive mill wastewater (OMW) is considered a promising low-cost practice for olive-oil producing countries. The objectives of this work were to investigate: (i) OMW treatment potential of a land treatment system (LTS), planted with a E. camaldulensis species, regarding N, P, C, and phenols; (ii) the effects of OMW on chemical properties of soil and soil solution characteristics; and (iii) the performance of E. camaldulensis in terms of biomass production and N and P recovery. E. camaldulensis received OMW for two growing seasons at rates based on maximum organic loading. These rates were almost equivalent to the reference evapotranspiration of the area. Soil solution and soil samples were collected from three different depths (15, 30 and 60 cm) at specified time intervals. -Also, samples of plant tissues were collected at the end of application periods. OMW land application resulted in significant reduction in inorganic and organic constituents of OMW. At 15 cm of soil profile, the average removal of COD, TKN, NH4 + -N, TP, In-P, and total phenols approached 93%, 86%, 70%, 86%, 82%, and 85%, respectively, while an increase in soil depth (30 and 60 cm) did not improve significantly treatment efficiency. Furthermore, OMW increased soil organic matter (SOM), total kjeldahl nitrogen (TKN), and available P, particularly in the upper soil layer. In contrast, low inorganic N content was observed in the soil throughout the study period caused probably by increased competition among soil microorganisms induced by the organic substrate supply and high C/N ratio. Also, electrical conductivity (EC) and SAR OPEN ACCESSWater 2015, 7 363 increased by OMW addition, but at levels that may do not pose severe risk for soil texture. Enhancement of soil fertility due to OMW application sustained eucalyptus trees and provided remarkable biomass yield. In conclusion, land application of OMW has a great potential for organic matter and phenol assimilation and can be effectively used for OMW detoxification.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 98%

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Land Application-Based Olive Mill Wastewater Μanagement

Kapellakis

Tzanakakis²,

Angelakιs

2015

Water

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“…If the release of organic materials from biochar were impacting soil microbes, one may expect the effect to decline with time as degradation, volatilization, or leaching reduced their concentrations (Saadi et al, 2007;Kim et al, 2011;Tsiknia et al, 2014). The persistent multi-year effects of biochar in our study may instead be related to its physical porosity and chemical binding capacity.…”

Section: Mechanism By Which Biochar Effects Soil Processesmentioning

confidence: 85%

Biochar and Manure Effects on Net Nitrogen Mineralization and Greenhouse Gas Emissions from Calcareous Soil under Corn

Lentz

Ippolito

Spokas³

2014

Soil Science Soc of Amer J

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Few multiyear field studies have examined the impacts of a one‐time biochar application on net N mineralization and greenhouse gas emissions in an irrigated, calcareous soil; yet this use of biochar is hypothesized as a means of sequestering atmospheric CO2 and improving soil quality. We fall‐applied four treatments: stockpiled dairy manure (42 Mg ha−1 dry wt.), hardwood‐derived biochar (22.4 Mg ha−1), combined biochar and manure, and no amendments (control). Nitrogen fertilizer was applied in all plots and years based on treatment's preseason soil test N and crop requirements and accounting for estimated N mineralized from added manure. From 2009 to 2011, we measured greenhouse gas fluxes using vented chambers, net N mineralization using buried bags, corn (Zea mays L.) yield, and N uptake, and in a succeeding year, root and shoot biomass and biomass C and N concentrations. Both amendments produced persistent soil effects. Manure increased seasonal and 3‐yr cumulative net N mineralization, root biomass, and root/shoot ratio 1.6‐fold, CO2–C gas flux 1.2‐fold, and reduced the soil NH4/NO3 ratio 58% relative to no‐manure treatments. When compared with a class comprising all other treatments, biochar‐only produced 33% less cumulative net N mineralization, 20% less CO2–C, and 50% less N2O‐N gas emissions, and increased the soil NH4/NO3 ratio 1.8‐fold, indicating that biochar impaired nitrification and N immobilization processes. The multi‐year nature of biochar's influence implies that a long‐term driver is involved, possibly related to biochar's enduring porosity and surface chemistry characteristics. While the biochar‐only treatment demonstrated a potential to increase corn yields and minimize CO2–C and N2O‐N gas emissions in these calcareous soils, biochar also caused decreased corn yields under conditions in which NH4–N dominated the soil inorganic N pool. Combining biochar with manure more effectively utilized the two soil amendments, as it eliminated potential yield reductions caused by biochar and maximized manure net N mineralization potential.

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“…On the other hand, probably there are limitations with regard to the applicability of the suggested model to other areas or different plant species [31]. Because of its advantages, PLSR method could also be ideal for the prediction of important management goals involving soil bio (chemical) parameters such as those involved in C and N cycles [30,32].…”

Section: Discussionmentioning

confidence: 99%

Prediction of Biomass Production and Nutrient Uptake in Land Application Using Partial Least Squares Regression Analysis

Tzanakakis¹,

Mauromoustakos

Angelakιs

2014

Water

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Partial Least Squares Regression (PLSR) can integrate a great number of variables and overcome collinearity problems, a fact that makes it suitable for intensive agronomical practices such as land application. In the present study a PLSR model was developed to predict important management goals, including biomass production and nutrient recovery (i.e., nitrogen and phosphorus), associated with treatment potential, environmental impacts, and economic benefits. Effluent loading and a considerable number of soil parameters commonly monitored in effluent irrigated lands were considered as potential predictor variables during the model development. All data were derived from a three year field trial including plantations of four different plant species (Acacia cyanophylla, Eucalyptus camaldulensis, Populus nigra, and Arundo donax), irrigated with pre-treated domestic effluent. PLSR method was very effective despite the small sample size and the wide nature of data set (with many highly correlated inputs and several highly correlated responses). Through PLSR method the number of initial predictor variables was reduced and only several variables were remained and included in the final PLSR model. The important input variables maintained were: Effluent loading, electrical conductivity (EC), available phosphorus (Olsen-P), Na 2 a large number of highly collinear and noisy input variables is monitored to assess plant species performance and to detect impacts on the environment.

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Effects of olive mill wastewater on soil carbon and nitrogen cycling

Cited by 69 publications

References 42 publications

Land Application-Based Olive Mill Wastewater Μanagement

Land Application-Based Olive Mill Wastewater Μanagement

Biochar and Manure Effects on Net Nitrogen Mineralization and Greenhouse Gas Emissions from Calcareous Soil under Corn

Prediction of Biomass Production and Nutrient Uptake in Land Application Using Partial Least Squares Regression Analysis

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