A review on sludge conditioning by sludge pre-treatment with a focus on advanced oxidation

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50644-50652 ◽  
Author(s):  
Xu Zhou ◽  
Guangming Jiang ◽  
Qilin Wang ◽  
Zhiguo Yuan
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Advanced Oxidation ◽  
Biological Wastewater Treatment ◽  
Excess Sludge ◽  
Treatment Processes ◽  
Sludge Conditioning ◽  
Pre Treatment

The production of excess sludge by biological wastewater treatment processes has been a serious issue for the operation of wastewater treatment plants (WWTP) on both the economic and environmental sides.

The Operation and Maintenance of Small Scale Wastewater Treatment Plants

1986 ◽  
Vol 18 (7-8) ◽  
pp. 313-318
Author(s):  
M. Takahashi
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Plug Flow ◽  
Small Scale ◽  
Oxidation Ditch ◽  
Excess Sludge ◽  
Treatment Processes ◽  
Operation And Maintenance ◽  
Methods Of Operation

Three wastewater treatment processes (oxidation ditch, extended aeration (plug flow type) and activated sludge batch reactor) which are considered to be suitable for small scale wastewater treatment plants were tested at a pilot plant, or using existing facilities to examine their methods of operation and maintenance. The objectives of this study were to determine production of excess sludge, a method of setting aeration intensity, and a method of controlling returned sludge.

AOPs enhance the migration of polystyrene nanoparticles in saturated quartz sand

2021 ◽  
Author(s):  
Kai-Xin Zhang ◽  
Chao Song ◽  
Shan Zhao ◽  
Zhen Yan ◽  
Li-Juan Feng ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Quartz Sand ◽  
Advanced Oxidation Processes ◽  
Wastewater Treatment Plants ◽  
Advanced Oxidation ◽  
Point Sources ◽  
Polystyrene Nanoparticles ◽  
Oxidation Processes ◽  
Treatment Processes ◽  
Significant Point

Wastewater treatment plants are suspected to be significant point sources of microplastic and nanoplastic particles (NPs) into the environment. As one of the main wastewater treatment processes, advanced oxidation processes...

scholarly journals Occurrence of SARS-CoV-2 RNA in Six Municipal Wastewater Treatment Plants at the Early Stage of COVID-19 Pandemic in The United States

Pathogens ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 798
Author(s):  
Samendra P. Sherchan ◽  
Shalina Shahin ◽  
Jeenal Patel ◽  
Lauren M. Ward ◽  
Sarmila Tandukar ◽  
...  
Keyword(s):  
United States ◽  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Quantitative Polymerase Chain Reaction ◽  
The United States ◽  
Secondary Effluent ◽  
Untreated Wastewater ◽  
Treatment Processes ◽  
Wastewater Samples

In this study, we investigated the occurrence of Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) RNA in primary influent (n = 42), secondary effluent (n = 24) and tertiary treated effluent (n = 34) collected from six wastewater treatment plants (WWTPs A–F) in Virginia (WWTP A), Florida (WWTPs B, C, and D), and Georgia (WWTPs E and F) in the United States during April–July 2020. Of the 100 wastewater samples analyzed, eight (19%) untreated wastewater samples collected from the primary influents contained SARS-CoV-2 RNA as measured by reverse transcriptase quantitative polymerase chain reaction (RT-qPCR) assays. SARS-CoV-2 RNA were detected in influent wastewater samples collected from WWTP A (Virginia), WWTPs E and F (Georgia) and WWTP D (Florida). Secondary and tertiary effluent samples were not positive for SARS-CoV-2 RNA indicating the treatment processes in these WWTPs potentially removed SARS-CoV-2 RNA during the secondary and tertiary treatment processes. However, further studies are needed to understand the log removal values (LRVs) and transmission risks of SARS-CoV-2 RNA through analyzing wastewater samples from a wider range of WWTPs.

Recommended notation for use in the description of biological wastewater treatment processes (Provisional)

1983 ◽  
Vol 55 (6) ◽  
pp. 1035-1040
Author(s):  
P. Grau ◽  
P. M. Sutton ◽  
S. Elmaleh ◽  
C. P. L. Grady ◽  
W. Gujer ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Biological Wastewater Treatment ◽  
Treatment Processes

Performance evaluation of different wastewater treatment technologies operating in a developing country

2011 ◽  
Vol 1 (1) ◽  
pp. 37-56 ◽  
Author(s):  
Sílvia C. Oliveira ◽  
Marcos von Sperling
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Septic Tank ◽  
Operational Parameters ◽  
Technical Literature ◽  
Effluent Quality ◽  
Loading Rates ◽  
Treatment Processes ◽  
Treatment Technologies ◽  
Uasb Reactors

This article analyses the performance of 166 wastewater treatment plants operating in Brazil, comprising six different treatment processes: septic tank + anaerobic filter, facultative pond, anaerobic pond + facultative pond, activated sludge, UASB reactors alone, UASB reactors followed by post-treatment. The study evaluates and compares the observed effluent quality and the removal efficiencies in terms of BOD, COD, TSS, TN, TP and FC with typical values reported in the technical literature. In view of the large performance variability observed, the existence of a relationship between design/operational parameters and treatment performance was investigated. From the results obtained, no consistent relationship between loading rates and effluent quality was found. The influence of loading rates differed from plant to plant, and the effluent quality was dictated by several combined factors related to design and operation.

scholarly journals Fate of selected pharmaceuticals and personal care products after secondary wastewater treatment processes in Taiwan

2010 ◽  
Vol 62 (10) ◽  
pp. 2450-2458 ◽  
Author(s):  
Angela Yu-Chen Lin ◽  
Cheng-Fan Lin ◽  
Yu-Ting Tsai ◽  
Hank Hui-Hsiang Lin ◽  
Jie Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
High Performance ◽  
Wastewater Treatment Plants ◽  
Solid Phase ◽  
Personal Care Products ◽  
Personal Care ◽  
Matrix Interference ◽  
Treatment Processes ◽  
Liquid Chromatography Tandem Mass ◽  
Removal Efficiencies

Pharmaceuticals and personal care products (PPCPs) constitute a class of chemicals of emerging concern due to the potential risks they pose to organisms and the environment, even at low concentrations (ng/L). Recent studies have found that PPCPs are not efficiently removed in secondary wastewater treatment plants (WWTPs). This study has: (1) simultaneously investigated the occurrence of sixty-one PPCPs using solid phase extraction and high-performance liquid chromatography-tandem mass spectrometry, (2) evaluated removal efficiencies of target PPCPs in six WWTPs that discharge effluents into major Taiwanese rivers, and lastly (3) examined matrix interference during analysis of target PPCPs in water samples. The twenty target PPCPs were chosen for their high detection frequencies, high influent concentrations, and stability during wastewater treatment processes. Caffeine and acetaminophen were detected at the highest concentrations (as high as 24,467 and 33,400 ng/L) and were effectively removed (both >96%); other PPCPs were detected in the high ng/L range but were not effectively removed. Matrix interference (by ion suppression or enhancement) during the analysis resulted in underestimation of the removal efficiencies of erythromycin-H2O, cefazolin, clarithromycin, ibuprofen, diclofenac, clofibric acid and gemfibrozil.

Prospects and problems of sludge pre-treatment processes

2001 ◽  
Vol 44 (10) ◽  
pp. 121-128 ◽  
Author(s):  
J.A. Müller
Keyword(s):  
Wastewater Treatment ◽  
Phase Changes ◽  
Ozone Treatment ◽  
Thermal Methods ◽  
Sludge Treatment ◽  
Freeze Thaw ◽  
Positive Effects ◽  
Treatment Processes ◽  
Stage Of Development ◽  
Pre Treatment

Pre-treatment processes have been developed in order to improve subsequent sludge treatment and disposal. Disintegration of sludge solids in the aqueous phase changes the sludge structure and solubilizes organic matter. This paper provides an overview of the applications of wet disintegration in wastewater and sludge treatment. Applied disintegration techniques such as mechanical, thermal, chemical and biological methods are briefly described. The methods are compared regarding energy consumption, operational reliability and stage of development for application on wastewater treatment plants. Mechanical and thermal methods appear to be most suitable at this stage. The effects of pre-treatment on subsequent sludge treatment processes and the wastewater treatment are described. The performance of various methods is assessed. For the improvement of stabilization, mechanical and ozone treatment as well as thermal treatment perform best. Dewatering can be enhanced by thermal and freeze/thaw treatment. All methods show positive effects in the reduction of the number of pathogens. Pre-treatment leads to secondary effects like the generation of recalcitrant compounds and odor, which is mainly a problem of thermal and ozone treatment. The evaluation of capital and operational costs is difficult, because of the lack of full-scale experience. Especially thermal, freeze/thaw and biological treatments can be realized at low costs if the conditions are appropriate. Nevertheless, the economic efficiency has to be investigated critically for each individual application.

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