Nitrification in Scrubber-Washed Wastewater of Sludge Drying Process by Expanded-Bed Activated Carbon Reactor.

An expanded-bed anaerobic reactor with granular activated carbon (GAC) medium has been developed to treat wastewaters that contain a high concentration of inhibitory and/or refractory organic compounds as well as readily degradable organic compounds. The process is characterised by a combination of two removal mechanisms; adsorption on GAC and biological degradation by microorganisms grown on GAC. Applicability of the reactor to treatment of phenol, chloroacetaldehyde (CAA), pentachlorophenol (PCP) and tetrachloroethylene (PCE) was discussed based on experimental data. All chemicals focused on here were removed well and stably at a removal efficiency of more than 98% even during starting operation and shock load operation. Chemicals in influent that exceeded biological degradation capacity was initially adsorbed on GAC and then gradually degraded, and hence the adsorptive capacity of GAC was regenerated biologically. These results proved that a biological activated carbon anaerobic reactor was effective for treatment of wastewater containing hazardous chemicals, especially for strongly absorbable chemicals, as well as readily degradable organic compounds at high concentration.

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Review on Sludge Drying Process and Dryer in Solar Energy

American Journal of Energy Engineering ◽

10.11648/j.ajee.20170505.12 ◽

2017 ◽

Vol 5 (5) ◽

pp. 34

Author(s):

Xiaojuan An

Keyword(s):

Solar Energy ◽

Drying Process ◽

Sludge Drying

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Pesticide removals in the nitrifying expanded-bed filter at drinking water treatment plant

Journal of Science and Technology in Civil Engineering (STCE) - NUCE ◽

10.31814/stce.nuce2021-15(1)-01 ◽

2020 ◽

Vol 15 (1) ◽

pp. 1-13

Author(s):

Nguyet Thi-Minh Dao ◽

The-Anh Nguyen ◽

Viet-Anh Nguyen ◽

Mitsuharu Terashima ◽

Hidenari Yasui

Keyword(s):

Drinking Water ◽

Activated Carbon ◽

Water Treatment ◽

Treatment Plant ◽

Drinking Water Treatment ◽

Cost Effective ◽

Water Treatment Plant ◽

Field Analysis ◽

Expanded Bed ◽

Biological Activated Carbon

The occurrence of pesticides even at low concentrations in drinking water sources might induce potential risks to public health. This study aimed to investigate the removal mechanisms of eight pesticides by the nitrifying expanded-bed filter using biological activated carbon media at the pretreatment of a drinking water plant. The field analysis demonstrated that four pesticides Flutolanil, Buprofezin, Chlorpyrifos, and Fenobucard, were removed at 82%, 55%, 54%, and 52% respectively, while others were not significantly removed. Under controlled laboratory conditions with continuous and batch experiments, the adsorption onto the biological activated carbon media was demonstrated to be the main removal pathway of the pesticides. The contribution of microorganisms to the pesticide removals was rather limited. The pesticide removals observed in the field reactor was speculated to be the adsorption on the suspended solids presented in the influent water. The obtained results highlighted the need to apply a more efficient and cost-effective technology to remove the pesticide in the drinking water treatment process. Keywords: biological activated carbon; drinking water treatment; nitrifying expanded-bed filter; pesticide removal.

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Masking agent efficiency on odor removal from WWTP sludge drying process

Water Practice & Technology ◽

10.2166/wpt.2018.017 ◽

2018 ◽

Author(s):

F. Rousseille ◽

A. Ventura

Keyword(s):

Control Unit ◽

Drying Process ◽

Odor Control ◽

Odor Concentration ◽

Odor Removal ◽

Masking Agents ◽

Last Stage ◽

Foul Odor ◽

Sludge Drying ◽

Dynamic Olfactometry

Abstract A study was executed in 2016 to determine the efficiency of two different neutralizers on odor perception from a sludge drying process. One of the products was injected by fogging system at the inlet of the odor control unit while the other was added directly to the washing solution of the last stage of the odor control unit, according to supplier recommendations. Performance evaluations encompassed complementary approaches including both sensorial analyses and analytical measures. Odor analyses were performed via dynamic olfactometry according to European Standard EN 13725 coupled with hedonic tone approach according to VDI 3882. Additional analyses on VOC emissions were conducted using gas chromatography screening. In parallel, several odor panels composed of site operators and plant neighbors carried out observations on the WWTP and its perimeter. The main conclusions of this study illustrates: • Only one test leads to a reduction of the odor concentration at the stack, • Overall, neither of the two masking agents significantly reduce the odor concentration at the stack, • The addition of masking agent seems to increase foul odor persistency, • The local odor panel observed no significant improvement in odor reduction within the environment around the WWTP.

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Influence of heating and moisture content on sludge drying process

Journal of Physics Conference Series ◽

10.1088/1742-6596/1426/1/012056 ◽

2020 ◽

Vol 1426 ◽

pp. 012056

Author(s):

M Flori ◽

D Miloştean

Keyword(s):

Moisture Content ◽

Drying Process ◽

Sludge Drying

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Simulation for Sludge Flocculation I: Brownian Dynamic Simulation for Perikinetic Flocculation of Charged Particle

Mathematical Problems in Engineering ◽

10.1155/2012/527384 ◽

2012 ◽

Vol 2012 ◽

pp. 1-17

Author(s):

Linshuang Liu ◽

Guolu Yang ◽

Minghui Yu

Keyword(s):

Electrostatic Force ◽

Radius Of Gyration ◽

Brownian Dynamic ◽

Drying Process ◽

Floc Structure ◽

Simulation Based ◽

Primary Particles ◽

High Turbidity ◽

Sludge Drying ◽

Original Cell

To investigate sludge drying process, a numerical simulation based on Brownian dynamic for the floc with uncharged and charged particles was conducted. The Langevin equation is used as dynamical equation for tracking each particle in a floc. An initial condition and periodic boundary condition which well conformed to reality is used for calculating the floc growth process. Each cell consists of 1000 primary particles with diameter 0.1 ∼ 4 μm. Floc growth is related to the thermal force and the electrostatic force. The electrostatic force on a particle in the simulation cell is considered as the sum of electrostatic forces from other particles in the original cell and its replicate cells. It is assumed that flocs are charged with precharged primary particles in dispersion system by ionization. By the analysis of the simulation figures, on one hand, the effects of initial particle size and sludge density on floc smashing time, floc radius of gyration, and fractal dimension were discussed. On the other hand, the effects of ionization on floc smashing time and floc structure were presented. This study has important practical value in the high-turbidity water treatment, especially for sludge drying.

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Development of a combined BAC and bz reactor for removal of nitrogen in wastewater from sludge drying process

Water Science & Technology ◽

10.1016/0273-1223(96)00504-5 ◽

1996 ◽

Vol 34 (1-2) ◽

Cited By ~ 4

Keyword(s):

Drying Process ◽

Sludge Drying

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Sewage sludge drying process integration with a waste-to-energy power plant

Waste Management ◽

10.1016/j.wasman.2015.04.020 ◽

2015 ◽

Vol 42 ◽

pp. 159-165 ◽

Cited By ~ 34

Author(s):

A. Bianchini ◽

L. Bonfiglioli ◽

M. Pellegrini ◽

C. Saccani

Keyword(s):

Power Plant ◽

Sewage Sludge ◽

Process Integration ◽

Waste To Energy ◽

Drying Process ◽

Sludge Drying

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Investigation of the effects of temperature and sludge characteristics on odors and VOC emissions during the drying process of sewage sludge

Water Science & Technology ◽

10.2166/wst.2015.246 ◽

2015 ◽

Vol 72 (4) ◽

pp. 543-552 ◽

Cited By ~ 4

Author(s):

Wenjie Ding ◽

Lin Li ◽

Junxin Liu

Keyword(s):

Volatile Organic Compounds ◽

Organic Compounds ◽

Wastewater Treatment Plants ◽

Scientific Data ◽

Gas Chromatography Mass Spectrometry ◽

Drying Process ◽

Drying Temperature ◽

Volatile Organic ◽

Sludge Drying ◽

Total Volatile Organic Compounds

Sludge drying is a necessary step for sludge disposal. In this study, sludge was collected from two wastewater treatment plants, and dried at different temperatures in the laboratory. The emission of odor and total volatile organic compounds (TVOCs) during the sludge drying process were determined by an online odor monitoring system. The volatile organic compounds (VOCs) in off-gas were analyzed by gas chromatography–mass spectrometry. Results showed that sludge with 30% moisture content could be obtained in 51 minutes under drying temperature 100 °C but only within 27 minutes under 150 °C. Concentration of odor, TVOCs, sulfur-containing compounds (SCCs), and amines were changed with drying temperature and sludge sources. The maximum concentration of odor, TVOCs, SCCs, and amines were 503.13 ppm, 3.01 ppm, 8.15 ppm, and 11.27 ppm, respectively, at drying temperature 100 °C. These values reached 1,250.79, 8.10, 53.51, and 37.80 ppm when sludge dried at 150 °C. Odor concentration had a close relationship with emission of SCCs, amines, and TVOCs. The main VOCs released were benzene series and organic acid. Potential migration of substances in sludge was examined via analysis of off-gas and condensate, aiming to provide scientific data for effective sludge treatment and off-gas control.

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