Toxic Effects of Pollutants on the Mineralization of 4-Chlorophenol and Benzoate in Methanogenic River Sediment

Beelen, P. van; Vlaardingen, P. van

doi:10.1897/1552-8618(1994)13[1051:teopot]2.0.co;2

Cited by 4 publications

(2 citation statements)

References 7 publications

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“…Chandler et al, 1994;Odin et al, 1994). Also, as noted by van Beelen & van Vlaardingen (1994), SQC derived solely from tests with aerobic organisms do not protect important microbial processes in anaerobic sediments. Finally, the compatibility (or lack thereof) of sediment and soil criteria was discussed but without resolution.…”

Section: Generic Sediment Quality Criteria (Sqc)mentioning

confidence: 98%

Sediment quality assessment: status and outlook

Chapman¹

1995

J Aquat Ecosyst Stress Recov

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This paper is a synthesis of the 44 presentations at the First International Symposium on Sediment Quality Assessment (Sweden, August 1994). The paper includes Initial Premises, Sediments, Tools (with particular emphasis on bioassays), Strategies and Challenges. Major testable hypotheses are proposed as follows (ranging in complexity, recognizing differences apparent at the Symposium in level of expertise and knowledge): (1) there is no single 'perfect' method of sediment assessment, there are only 'tools in the toolbox'; (2) significant sediment pollution (contamination resulting in adverse biological effects) comes from non-anthropogenic sources;(3) artificial sediments will provide future reference comparisons; (4) knowledge of suspended sediments is required to understand bedded sediments; (5) ammonia and/or hydrogen sulfide cannot explain all sediment toxicity, in particular non-acute responses; (6) subcellular (e.g., genetic) responses are a research tool, not yet appropriate for monitoring or assessment; (7) although the effects of sediment storage cannot be predicted, non-toxic and highly toxic sediments are less affected by prolonged storage than are moderately toxic sediments; (8) sediment ingestion is a more important route of exposure than pore water for some organisms; (9) water column organisms and aqueous exposures should not be used for whole-organism sediment tests; (10) validation of sediment bioassays is not always simple or possible. Two major conclusions are: (i) generalizations are not [yet] possible regarding sediment quality; (ii) correctly assessing sediment quality is primarily a function of the correct reference comparison.

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Section: Generic Sediment Quality Criteria (Sqc)mentioning

confidence: 98%

Sediment quality assessment: status and outlook

Chapman¹

1995

J Aquat Ecosyst Stress Recov

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“…Several chemicals have been reported to inhibit the AD microbial activities such as ammonia (Angelidaki & Ahring, 1993), sulfide (Harada, Uemura, & Momonoi, 1994), light metal ions (McCarty & McKinney, 1961), heavy metals (Swanwick, Shurben, & Jackson, 1969), and a wide range of organics (Babich & Stotzky, 1983; Blum & Speece, 1991; Borja, Alba, & Banks, 1997; Koster & Cramer, 1987; Van Beelen & Van Vlaardingen, 1994; Yang & Speece, 1986). For a recent review of inhibitory compounds, see Chen, Cheng, and Creamer (2008).…”

Section: Introductionmentioning

confidence: 99%

The inhibitory impact of ammonia on thermally hydrolyzed sludge fed anaerobic digestion

Ladipo‐Obasa

Romero

et al. 2021

Water Environment Research

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This study evaluated the impact of ammonia on mesophilic anaerobic digestion (AD) with thermal hydrolysis pretreatment (THP) treating a mixture of primary sludge and waste activated sludge and operated under constant organic loading rate of 9 kg COD/m3/d. Free ammonia concentrations in the digesters were varied between 37 and 966 mg NH3‐N/L, while maintaining all other operational conditions constant. A decrease in volatile solids reduction from 54 ± 5% (at <554 mg NH3‐N/L) to 35 ± 6% at the maximum free ammonia concentration of 966 mg NH3‐N/L was observed at steady‐state conditions. No impact of free ammonia on final dewaterability was detected. Free ammonia thus mostly limited methanogenesis. A free ammonia Monod inhibition constant of 847 ± 222 mg NH3‐N/L for methanogens was estimated based on the digester steady‐state methane rates dynamics. This study showed that current THP AD digesters (typically 110–260 mg NH3‐N/L) operate under 12%–18% ammonia inhibition for methanogenesis. Operation under SRT of 15 days, about 2 times more than needed to retain methanogens, can compensate for lower methanogens rates and avoid performance impacts. The later shows a good potential to operate under higher free and total ammonia concentration without jeopardizing performance. Practitioner points Only from a free ammonia concentration above 554 mg NH3‐N/L, decreased volatile solids reduction and biogas yield were observed. A volatile solids reduction of 35 ± 6% at maximum free ammonia concentration of 966 mg NH3‐N/L was still achieved. A Monod inhibition constant for methanogens of 847 ± 222 mg NH3‐N/L was estimated. It was estimated that current THP AD systems (110–260 mg NH3‐N/L) operate under 12%–18% NH3 inhibition for methanogenesis.

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Ecological rehabilitation of the River Rhine: Plans, progress and perspectives

Dijk

Marteijn

Schulte-Wülwer-Leidig³

1995

Regul. Rivers: Res. Mgmt.

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The River Rhine has suffered because of numerous drastic environmental changesfor example, the regulation of the river bed and the construction of weirs and dams. Furthermore, discharges of agricultural, industrial and municipal wastewater have caused a deterioration in the water quality. This problem became particularly acute in the 1960s and 1970s. After the Sandoz accident in Basle in November 1986, the states bordering the River Rhine agreed the Rhine Action Programme for its ecological rehabilitation. This programme has the following four aims, which should be realized by the year 2000: (1) to create conditions which will enable the return of higher species (such as salmon); (2) to safeguard Rhine water as a source for the preparation of drinking water; (3) to abate the contamination of sediments due to toxic compounds; and (4) to fulfil the requirements of the North Sea Action Plan, as the River Rhine flows into the North Sea. Water quality criteria have been developed for about 50 contaminants or contaminant groups and for phosphorus and ammonium. Early signs of the ecological recovery of some aquatic communities in the River Rhine have been observed, but eutrophication and pollution by micropollutants, in particular polychlorinated biphenyls found in suspended matter, sediments and biota, still form a serious threat. In addition to further improving the water quality, river habitats must be improved, reversing the artificial river control measures taken in the past for the return of a number of characteristic riverine organisms such as migratory fish. The 'Ecological Master Plan for the River Rhine' aims to restore the mainstream, along with the main tributaries, as habitats for migratory fish (e.g. salmon). This involves protecting, preserving and improving ecologically important reaches of the River Rhine and the Rhine valley. The first steps for realizing the hydrological and morphological modifications have been taken, starting with the development of a specific ecological network focusing on the most important floodplain areas along the Rhine. Habitat improvement measures started later than the pollution abatement measures and, so far, relatively few studies on the effectiveness of the ecological rehabilitation techniques concerning habitat improvements in the Lower Rhine have been published. A major task for research programmes will be to identify the detailed quantifiable and verifiable ecological objectives (e.g. water quality criteria, hydrological and morphological targets) to guarantee the actual ecological rehabilitation of the River Rhine.

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Toxic Effects of Pollutants on the Mineralization of 4-Chlorophenol and Benzoate in Methanogenic River Sediment

Cited by 4 publications

References 7 publications

Sediment quality assessment: status and outlook

Sediment quality assessment: status and outlook

The inhibitory impact of ammonia on thermally hydrolyzed sludge fed anaerobic digestion

Ecological rehabilitation of the River Rhine: Plans, progress and perspectives

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