Anaerobic treatment of thermal sludge conditioning liquor with granular sludge

Thermal sludge conditioning liquor from a municipal wastewater treatment plant was successfully treated with a pilot-scale upflow anaerobic hybrid reactor with an effective volume of 10.4 cu.m. More than 70% of soluble COD in the influent was removed even at an organic loading as high as 30 kgCOD/cu.m/day. Though the reactor was seeded with an anaerobically digested sludge, granular sludge was produced in the reactor. The ratio of granular sludge to the solids in the reactor increased up to about 70% at the end of experiment. Biological activity of the granular sludge was measured as a methane producing rate using an acetate solution. Physical characteristics of the sludge, such as diameter distribution, composition and settling velocity, were also measured. It was found through tracer tests using lithium chloride that the reactor worked as a CSTR.

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Granular sludge bed anaerobic treatment systems for resource recovery

Waste Biorefinery ◽

10.1016/b978-0-12-818228-4.00004-6 ◽

2020 ◽

pp. 107-124

Author(s):

Hamidreza Mojab ◽

Eldon Raj ◽

Santiago Pacheco-Ruiz

Keyword(s):

Granular Sludge ◽

Resource Recovery ◽

Anaerobic Treatment

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An advanced anaerobic expanded granular sludge bed (AnaEG) for the treatment of coal gasification wastewater

RSC Advances ◽

10.1039/c4ra08042d ◽

2014 ◽

Vol 4 (101) ◽

pp. 57580-57586 ◽

Cited By ~ 16

Author(s):

Chunjie Li ◽

Salma Tabassum ◽

Zhenjia Zhang

Keyword(s):

Industrial Wastewater ◽

Coal Gasification ◽

State Of The Art ◽

Granular Sludge ◽

Anaerobic Treatment ◽

High Toxicity ◽

Coal Gasification Wastewater

A state-of-the-art advanced anaerobic expanded granular sludge bed (AnaEG) was developed for the anaerobic treatment of coal gasification wastewater (typical industrial wastewater with poor biodegradability and high toxicity).

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Study on IC Reactor Treating Straw-Washing Wastewater and Changes of Sludge Bed

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.2834 ◽

2012 ◽

Vol 518-523 ◽

pp. 2834-2843

Author(s):

Ke Zeng ◽

Shi Hao Liu ◽

Yu Jie Hou ◽

Ming Lei Zhang

Keyword(s):

Removal Rate ◽

Control Level ◽

Granular Sludge ◽

Anaerobic Treatment ◽

Gas Production ◽

Normal Operation ◽

Cod Removal Rate ◽

Washing Wastewater ◽

Operation Phase ◽

Washing Water

In this paper, we utilized IC reactor to treat straw-washing wastewater of straw pulping and papermaking. The removal rate of COD in normal operation is 28.14%, which is much lower than the value of wake-up stage and acclimation stage; gas production rate in the whole normal operation phase kept a lower level, and the average is 12.36L/h; so straw-washing water is not suitable for advanced anaerobic treatment. While COD removal rate is 28.14%, SCOD removal rate is only 6.96%; added the effluent VFA concentration which is 692~1211mg/L is greatly exceed normal control level, we can know that when treating straw-washing water the biological system was under acidification phase of the anaerobic process. Thus the straw-washing water is suitable for hydrolysis-acidification Process. Granular size of seed sludge was 3~5mm, 100 days later it became 1.5~3mm, and 120 days later it was 1~2.5mm mainly, With the acidification occurring, the mass proportion of the granular sludge to total sludge was reduced, the proportions of 2# and 3# sampling ports are decreasing from 70~85% to 30~50%. Because of lack of adequate nutrition and appropriate loading conditions, straw-washing water can’t support the cultivation and maintenance of granular sludge.

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Anaerobic treatment of domestic sewage at low temperature

Water Science & Technology ◽

10.2166/wst.2001.0171 ◽

2001 ◽

Vol 44 (4) ◽

pp. 33-40 ◽

Cited By ~ 28

Author(s):

T. Elmitwalli ◽

Gr. Zeeman ◽

G. Lettinga

Keyword(s):

Low Temperature ◽

Granular Sludge ◽

Anaerobic Treatment ◽

Domestic Sewage ◽

Uasb Reactor ◽

The Novel ◽

Reactor Performance ◽

Batch Tests ◽

Pre Treatment ◽

Attached Form

The results of research concerning the feasibility of anaerobic treatment of domestic sewage at low temperature are summarized in this article. The batch tests demonstrated a high biodegradability of domestic sewage at 20°C (74%). Both batch and continuous experiments for the treatment of domestic sewage showed that the removal of SS prior to anaerobic treatment of domestic sewage not only provides a stable reactor performance but also improves the removal of both colloidal (CODcol) and dissolved COD (CODdis). The results of the pre-treatment of domestic sewage in an anaerobic filter (AF) and an anaerobic hybrid (AH) reactor showed that the AF reactor is an efficient process for the removal of suspended COD (CODss), viz. 82%, at an HRT of 4 h and 13°C. The novel AF reactor consists of vertical sheets of reticulated polyurethane foam with knobs, where the biomass was only in attached form. For the treatment of pre-settled sewage at 13°C, the AH reactor, with granular sludge, showed a higher total COD (CODt) removal than the UASB reactor as a result of higher CODcol removal. Therefore, the performance of a two-step system, AF+AH (with granular sludge) reactor, was investigated with different HRTs at 13°C. For optimization of CODss and CODdis an HRT of 4+4 h is needed, while for optimization of CODcol removal an HRT of 4+8 h is required. A CODt removal of 71% was achieved with 60% conversion to methane from the removed CODt when the AF+AH system was operated at an HRT of 4+8 h at 13°C.

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Anaerobic Treatment of Slaughterhouse Wastewater in an Expanded Granular Sludge Bed (EGSB) Reactor

Water Science & Technology ◽

10.2166/wst.1999.0396 ◽

1999 ◽

Vol 40 (8) ◽

pp. 99-106 ◽

Cited By ~ 18

Author(s):

L. A. Núñez ◽

B. Martínez

Keyword(s):

Suspended Solids ◽

Hydraulic Retention Time ◽

Granular Sludge ◽

Anaerobic Treatment ◽

Slaughterhouse Wastewater ◽

Methanogenic Activity ◽

Loading Rates ◽

Feasible Option ◽

One Year ◽

Sludge Activity

The performance of an Expanded Granular Sludge Bed (EGSB) reactor for treating slaughterhouse wastewater under mesophilic conditions (35°C), was investigated. The reactor was inoculated with granular sludge from an anaerobic reactor of a brewery factory. The averaged COD removal percentages were 67% for total organic loading rates (BV.TCOD) up to 15 kg COD m−3 d−1 and a hydraulic retention time (HRT) of 5 h. Total suspended solids (TSS) were 90% removed for total solids loads of 6 kg TSS m−3 d−1. Fats were 85% removed and no accumulation of fats on the sludge was observed. The specific methanogenic activity of the sludge, after 140 days, was about three times higher than the sludge inoculated into the reactor. The sludge activity did not significantly change after one year of work. These findings indicate that the anaerobic treatment of slaughterhouse wastewater in an EGSB system appears to be a feasible option.

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