Laboratory-Scale Evaluation of the Effects of Water-Filled Pore Space on Emissions of CO2, CH4, N2O, and N2 from Soil-Based Wastewater Treatment

This paper reports the results of an investigation aimed at evaluating the laboratory-scale performance of an innovative process for treating tannery wastewater. In this process, biological degradation, carried out in a sequencing batch biofilm reactor (SBBR), is combined with chemical oxidation by ozone. Tannery wastewater treatment was carried out, at laboratory scale, on a real primary effluent coming from a centralised plant treating wastewater produced by a large tannery district in Northern Italy. SBBR performance both without and with ozonation, was assessed with very satisfactory results. In particular, in the latter instance the recorded COD, TKN and TSS average removals, (96%), (92%) and (98%) respectively, allowed the maximum allowable concentration values fixed by the Italian regulation in force to be achieved without any additional polishing step. During the investigation biofilm properties (biofilm concentration and biofilm density) and flow dynamics aspects (head loss, shear stress, bed porosity) were also studied. A major feature of the process is that, with or without ozonation, it was characterised by very low specific sludge production (0.05 kgVSS/kgCODremoved) and high biofilm density (i.e. 87-122 gVSS/Lsludge) both contributing to a rather high biofilm concentration (i.e. 31-44 gTSS/Lfilter).

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Laboratory scale evaluation of coagulants for treatment of stormwater

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2020.101271 ◽

2020 ◽

Vol 36 ◽

pp. 101271

Author(s):

Fredrik Nyström ◽

Kerstin Nordqvist ◽

Inga Herrmann ◽

Annelie Hedström ◽

Maria Viklander

Keyword(s):

Laboratory Scale ◽

Scale Evaluation

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Dynamics of upward and downward N2O and CO2 fluxes in ploughed or no-tilled soils in relation to water-filled pore space, compaction and crop presence

Soil and Tillage Research ◽

10.1016/j.still.2008.05.012 ◽

2008 ◽

Vol 101 (1-2) ◽

pp. 20-30 ◽

Cited By ~ 77

Author(s):

B BALL ◽

I CRICHTON ◽

G HORGAN

Keyword(s):

Pore Space ◽

Co2 Fluxes ◽

Water Filled Pore Space

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Efficient treatment of dairy processing wastewater in a laboratory scale Intermittently Aerated Sequencing Batch Reactor (IASBR)

Journal of Dairy Research ◽

10.1017/s0022029918000584 ◽

2018 ◽

Vol 85 (3) ◽

pp. 379-383 ◽

Cited By ~ 1

Author(s):

Peter Leonard ◽

Emma Tarpey ◽

William Finnegan ◽

Xinmin Zhan

Keyword(s):

Wastewater Treatment ◽

Retention Time ◽

Wastewater Treatment Plant ◽

Sequencing Batch Reactor ◽

Batch Reactor ◽

Treatment Plant ◽

Laboratory Scale ◽

Synthetic Wastewater ◽

Operational Parameters ◽

Dairy Processing

This Research Communication describes an investigation into the viability of an Intermittently Aerated Sequencing Batch Reactor (IASBR) for the treatment of dairy processing wastewater at laboratory-scale. A number of operational parameters have been varied and the effect has been monitored in order to determine optimal conditions for maximising removal efficiencies. These operational parameters include Hydraulic Retention Time (HRT), Solids Retention Time (SRT), aeration rate and cycle length. Real dairy processing wastewater and synthetic wastewater have been treated using three laboratory-scale IASBR units in a temperature controlled room. When the operational conditions were established, the units were seeded using sludge from a municipal wastewater treatment plant for the first experiment, and sludge from a dairy processing factory for the second and third experiment. In experiment three, the reactors were fed on real wastewater from the wastewater treatment plant at this dairy processing factory. These laboratory-scale systems will be used to demonstrate over time that the IASBR system is a consistent, viable option for treatment of dairy processing wastewater in this sector. In this study, the capacity of a biological system to remove both nitrogen and phosphorus within one reactor will be demonstrated. The initial operational parameters for a pilot-scale IASBR system will be derived from the results of the study.

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Methane emission by plant communities in an alpine meadow on the Qinghai-Tibetan Plateau: a new experimental study of alpine meadows and oat pasture

Biology Letters ◽

10.1098/rsbl.2009.0123 ◽

2009 ◽

Vol 5 (4) ◽

pp. 535-538 ◽

Cited By ~ 22

Author(s):

Shiping Wang ◽

Xiaoxia Yang ◽

Xingwu Lin ◽

Yigang Hu ◽

Caiyun Luo ◽

...

Keyword(s):

Experimental Study ◽

Soil Temperature ◽

Plant Communities ◽

Alpine Meadow ◽

Pore Space ◽

Bare Soil ◽

Chemical Mechanism ◽

Limited Evidence ◽

Growing Seasons ◽

Water Filled Pore Space

Recently, plant-derived methane (CH 4 ) emission has been questioned because limited evidence of the chemical mechanism has been identified to account for the process. We conducted an experiment with four treatments (i.e. winter-grazed, natural alpine meadow; naturally restored alpine meadow eight years after cultivation; oat pasture and bare soil without roots) during the growing seasons of 2007 and 2008 to examine the question of CH 4 emission by plant communities in the alpine meadow. Each treatment consumed CH 4 in closed, opaque chambers in the field, but two types of alpine meadow vegetation reduced CH 4 consumption compared with bare soil, whereas oat pasture increased consumption. This result could imply that meadow vegetation produces CH 4 . However, measurements of soil temperature and water content showed significant differences between vegetated and bare soil and appeared to explain differences in CH 4 production between treatments. Our study strongly suggests that the apparent CH 4 production by vegetation, when compared with bare soil in some previous studies, might represent differences in soil temperature and water-filled pore space and not the true vegetation sources of CH 4 .

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