Removal of Trace Organic Micropollutants by Drinking Water Biological Filters

Zearley, Thomas L.; Summers, R. Scott

doi:10.1021/es301428e

Cited by 166 publications

(124 citation statements)

References 34 publications

Supporting

Mentioning

109

Contrasting

Unclassified

Order By: Relevance

“…Total removals by sand filters vary from 2 % for carbamazepine to >95 % for ibuprofen [64] (Figure 2, Table 5), similar to those achieved by activated sludge.…”

Section: 1supporting

confidence: 61%

See 1 more Smart Citation

Fate of drugs during wastewater treatment

Petrie

McAdam

Scrimshaw

et al. 2013

TrAC Trends in Analytical Chemistry

View full text Add to dashboard Cite

Recent trends for the determination of pharmaceutical drugs in wastewaters focus on the development of rapid multi-residue methods. These encompass a large number of drugs (up to 90) of varying physicochemical composition (hydrophobicity, molecular weight etc) at ng l -1 concentrations in the aqueous phase of complex heterogeneous matrices. These are well suited for drug determination in secondary effluents which contain detectable concentrations of pharmaceuticals. Drugs are not routinely monitored for in particulate phases of wastewaters despite being essential for fate determination, particularly in secondary processes receiving relatively high concentrations of suspended solids. Secondary effluents tend to contain multiple drugs, often above their proposed legislative targets for consent. Thus, tertiary processing may be considered to enhance drug removal and provide additional environmental protection. However, current analytical methods do not enable the efficacy of tertiary processes to be fully ascertained due to the inherently lower drug concentrations achieved. Existing method optimisation is required to lower detection capabilities for tertiary process monitoring. This would aid the understanding of breakdown reaction completeness and the criticality between parent drug and degradation product concentrations. Numerous degradation products are formed by biological and chemical processes which can exhibit toxicity. The complimentary use of biological assays here would improve understanding of the synergistic toxicological effect of multiple drugs and their degradation products at low concentration. Additionally, tertiary processes receive secondary effluents comprising comparatively high concentrations of dissolved organics (e.g., colloids). However, knowledge of drug behaviour in the charged colloidal fraction of wastewater and its impact to treatment is limited. Monitoring and understanding here is needed to develop tertiary process diagnosis and optimisation.

show abstract

“…Total removals by sand filters vary from 2 % for carbamazepine to >95 % for ibuprofen [64] (Figure 2, Table 5), similar to those achieved by activated sludge.…”

Section: 1supporting

confidence: 61%

“…To fully ascertain tertiary process performance, analytical methods require MQLs <10 ng l -1 [64,[70][71]74], and ideally <1 ng l -1 [66,[69][70][71] (Tables A2-4). This poses a further analytical challenge as such concentrations cannot be ascertained for the majority of drugs with current MQLs.…”

Section: Future Trendsmentioning

confidence: 99%

Fate of drugs during wastewater treatment

Petrie

McAdam

Scrimshaw

et al. 2013

TrAC Trends in Analytical Chemistry

View full text Add to dashboard Cite

show abstract

“…Recently, we observed the potential for the remediation of groundwater polluted by the pesticide residue 2,6-dichlorobenzamide (BAM) in a sand filter bioaugmented with specific BAM-degrading bacteria (11). Laboratory-scale sand filters with sand and bacteria from a fullscale waterworks similarly removed various organic chemicals, including the pesticides 2,4-dichlorophenoxyacetic acid (2,4-D), aldicarb, chlorpyrifos, and diazinon (12).…”

mentioning

confidence: 99%

Establishment of Bacterial Herbicide Degraders in a Rapid Sand Filter for Bioremediation of Phenoxypropionate-Polluted Groundwater

Feld

Nielsen

Hansen

et al. 2016

Appl Environ Microbiol

View full text Add to dashboard Cite

In this study, we investigated the establishment of natural bacterial degraders in a sand filter treating groundwater contaminated with the phenoxypropionate herbicides (RS)-2-(4-chloro-2-methylphenoxy)propanoic acid (MCPP) and (RS)-2-(2,4-dichlorophenoxy)propanoic acid (DCPP) and the associated impurity/catabolite 4-chlorophenoxypropanoic acid (4-CPP). A pilot facility was set up in a contaminated landfill site. Anaerobic groundwater was pumped up and passed through an aeration basin and subsequently through a rapid sand filter, which is characterized by a short residence time of the water in the filter. For 3 months, the degradation of DCPP, MCPP, and 4-CPP in the sand filter increased to 15 to 30% of the inlet concentration. A significant selection for natural bacterial herbicide degraders also occurred in the sand filter. Using a most-probable-number (MPN) method, we found a steady increase in the number of culturable phenoxypropionate degraders, reaching approximately 5 ؋ 10 5 degraders per g sand by the end of the study. Using a quantitative PCR targeting the two phenoxypropionate degradation genes, rdpA and sdpA, encoding stereospecific dioxygenases, a parallel increase was observed, but with the gene copy numbers being about 2 to 3 log units higher than the MPN. In general, the sdpA gene was more abundant than the rdpA gene, and the establishment of a significant population of bacteria harboring sdpA occurred faster than the establishment of an rdpA gene-carrying population. The identities of the specific herbicide degraders in the sand filter were assessed by Illumina MiSeq sequencing of 16S rRNA genes from sand filter samples and from selected MPN plate wells. We propose a list of potential degrader bacteria involved in herbicide degradation, including representatives belonging to the Comamonadaceae and Sphingomonadales.G roundwater is a valuable resource that is used for drinking water in many countries all over the world. The quality of the water is vital to our health, and regulations have been made to control the concentration of contaminants and protect the groundwater (1). A major concern is leaching of pesticides mainly from agricultural areas but also from urban areas or from point sources (2). In the European Union, a legal threshold limit has been set at 0.1 g/liter for any given pesticide or 0.5 g/liter for a total concentration of mixed pesticides in drinking water (3).In Denmark, monitoring of the groundwater status has detected pesticides in almost 40% of the investigated wells, and the concentrations exceed the allowed threshold limit in 12% of the wells (4). Phenoxypropionate herbicides, including the compounds (RS)-2-(2,4-dichlorophenoxy)propanoic acid (known as DCPP or dichlorprop) and (RS)-2-(4-chloro-2-methylphenoxy)propanoic acid (known as MCPP or mecoprop), are among the pesticides frequently found in contaminated wells (4). The herbicides are, in particular, a problem in old landfill areas, from where they are leaching into the groundwater as a point source contamination (5). Phe...

show abstract

“…Diversos estudos foram desenvolvidos nos últimos anos a respeito do potencial de remoção de compostos dos quais ainda não se havia conhecimento, os chamados contaminantes emergentes. A exemplo, a filtração lenta apresenta resultados promissores na remoção de tipos diferenciados de agrotóxicos, fármacos, dentre outros (SUMMERS, 2014;ZEARLEY;SUMMERS, 2012).…”

Section: Introductionunclassified

Diagnóstico e discussão sobre uso da Filtração Lenta para abastecimento público em Santa Catarina, Brasil

Souza¹,

Toscano²,

Carneiro³

et al. 2018

RDAE

View full text Add to dashboard Cite

Diagnóstico e discussão sobre uso da Filtração Lenta para abastecimento público em Santa Catarina, Brasil A diagnosis and discussion about the use of Slow Sand Filtration for public drinking water supply in Santa Catarina, BrazilResumo A filtração lenta é uma técnica simples para o tratamento de água e uma das mais antigas utilizadas no abastecimento público. Com o tempo, essa tecnologia perdeu espaço para sistemas que demandam, relativamente, menor área útil de ocupação, como a coagulação e a filtração rápida ou direta. Portanto, considera-se que há pouca informação sobre o uso atual dessa técnica de filtração para estudos na área. Em vista disso, esse estudo foi realizado com o intuito de fazer um levantamento e diagnóstico do uso da filtração lenta no estado de Santa Catarina. Estações de tratamento de água com filtros lentos foram identificadas e visitadas em todo o estado; os resultados de questionários aplicados in loco e observações em visitas técnicas são apresentados. Embora simples, observou-se que os problemas encontrados na aplicação da tecnologia estão relacionados à falta de conhecimento específico sobre o assunto. Concluiu-se que a filtração lenta ainda é aplicada no estado e a disseminação de conhecimento sobre a tecnologia é de suma importância para sua preservação, manutenção, melhor aplicação e disseminação em prol de seu uso. Palavras-chave: Abastecimento público. Filtro lento. Operação de ETA. Abstract Slow sand filtration is a simple technique for drinking water treatment and one of the oldest used for drinking water assessment. Over time, it lost its place for systems with coagulation and rapid filtration that demand smaller area prints relatively. Little information about the current application of this technology is found in studies in this field. This study was performed with the intention of making a survey and diagnosis of the use of slow sand filtration in

show abstract

Removal of Trace Organic Micropollutants by Drinking Water Biological Filters

Cited by 166 publications

References 34 publications

Fate of drugs during wastewater treatment

Fate of drugs during wastewater treatment

Establishment of Bacterial Herbicide Degraders in a Rapid Sand Filter for Bioremediation of Phenoxypropionate-Polluted Groundwater

Diagnóstico e discussão sobre uso da Filtração Lenta para abastecimento público em Santa Catarina, Brasil

Contact Info

Product

Resources

About