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

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.

Research for Start-Up Experiment about IC Reactor to Treat Straw-Washing Wastewater in Straw Based Pulping and Papermaking

2013 ◽  
Vol 361-363 ◽  
pp. 691-696
Author(s):  
Hong Chao Zhang ◽  
Yan Ping Cui ◽  
Ke Zeng ◽  
Xu Dong Wan
Keyword(s):  
Removal Rate ◽  
Anaerobic Treatment ◽  
Volume Loading ◽  
Start Up ◽  
Fluctuation Range ◽  
Hydrolysis Acidification ◽  
Cod Removal Rate ◽  
Washing Wastewater ◽  
High Level ◽  
Washing Water

In this paper, an IC reactor whose effective volume was 6m3 was used in the experiment to determine the best condition when decontaminating the straw-washing water produced in the straw-based pulping and papermaking industry. The best condition of IC reactor to treat straw-washing wastewater through experiment was: the pH should be controlled in the neutral range, not less than 6.6; the temperature should be maintained at about 31°C, not more than 35°C; the fluctuation range of volume loading should better not be over 15%; To meet the alkalinity of the reactor over 1000mg/L, the dosage of sodium bicarbonate was 12kg / d. In the processing of reactor treating straw-washing wastewater, COD removal rate was lower, and effluent VFA stayed at a high level continuously. So the hydrolysis-acidification process was more appropriate than anaerobic treatment when decontaminating the straw-washing water.

Effect and Circulating of IC Reactor Treating Straw-Washing Wastewater

2014 ◽  
Vol 881-883 ◽  
pp. 540-545
Author(s):  
Ke Zeng ◽  
Shi Hao Liu ◽  
Hong Chao Zhang ◽  
Yan Ping Cui
Keyword(s):  
Production Rate ◽  
Flow Rate ◽  
Removal Rate ◽  
Circulatory System ◽  
Gas Production ◽  
Hydrolysis Acidification ◽  
Cod Removal Rate ◽  
Washing Wastewater ◽  
Waking Up ◽  
Washing Water

An IC reactor volume 6m3 was used to treat the straw-washing water produced in a pulping and papermaking mill in experiment. When loading rate was 3.34~6.28kgCOD/(m3·d) COD average removal rate was 28.14%, that was lower than COD average removal rate of sludge waking up stage (47.30%) and acclimation stage (51.14%), and also lower than COD removal rate (50~80%) of IC running well. Gas production rate of the reactor was 1.53~32.17L/h, and effluent VFA was 746.0~1211.0mg/L. So hydrolysis-acidification process was more appropriate than anaerobic process when treating the straw-washing water. Due to low concentration of the wastewater and less gas production, the inner circulatory system of the reactor produced discontinuous ascending flow. When gas production rate of the reactor was 12.00~54.55L/h, flow rate of lifting pipe was 1.20~12.86L/h, and the ratio of flow rate and gas production rate was 0.08~0.36. Down pipe produced intermittent backflow, backflow rate reached 518.4~725.1L/h.

Anaerobic Treatment of Cheese Dairy Wastewater Using the SNC Bioreactor

1993 ◽  
Vol 28 (3) ◽  
pp. 597-620 ◽  
Author(s):  
Catherine N. Mulligan ◽  
Bechara F. Safi ◽  
Jacques Meunier ◽  
Jean Chebib
Keyword(s):  
Retention Time ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Gas Production ◽  
Cod Removal ◽  
Dairy Wastewater ◽  
Organic Load ◽  
Whey Permeate ◽  
Cod Removal Rate

Abstract The SNC multiplate reactor (1,200 L) has been developed and tested to determine chemical oxygen demand (COD) removal, nutrient requirement, and gas production from the anaerobic treatment of effluents generated at the Agropur (Notre Dame-du-Bon-Conseil, Quebec) and Nutrinor cheese dairies (Chambord, Quebec). At the Agropur plant, wastewater (3,000 mg/L COD) was treated the best at a retention time of 12 h. Using this retention time, effluents containing whey with organic loads of 10.2 to 41.6 kg COD/m3/day could be treated at a 84% COD removal rate. When the reactor was subjected to shock by increasing the organic load suddenly from 8.9 to 31 kg COD/m3/day, the total COD removal decreased to 72% and then returned to 86% after 7 days. Hydrology tests indicated that the reactor functions as a series of completely mixed stirred tanks. At Nutrinor, using a 12-h retention time and diluted whey permeate (20,000 mg/L COD), total COD removal was 86% and gas production was 12.0 m3/m3/day for a loading of 36.5 kg COD/m3/day. Nutrient supplementation was not required. For experiments performed with different proportions of wastewater (2,000 mg/L COD) to whey permeate (70,000 mg/L COD) results of 89% total and 93% soluble COD removal with a gas production of 11 m3/m3/day for a loading of 25 kg COD/m3/day were obtained. Retention times were varied from 18 to 60 h to correspond to initial CODs of 20,000 to 70,000 mg/L. In conclusion, this reactor functions in a superior manner to other published anaerobic treatment systems.

scholarly journals Bio-hydrogen Production From Vinasse By Using Agent Fermentation Of Photosynthetic Bacteria Rhodobium marinum

2020 ◽  
Vol 4 (1) ◽  
pp. 23-27
Author(s):  
Nusaibah - Nusaibah ◽  
Khaswar - Syamsu ◽  
Dwi - Susilaningsih
Keyword(s):  
Hydrogen Production ◽  
Photosynthetic Bacteria ◽  
Removal Rate ◽  
Gas Production ◽  
Hydrogen Gas ◽  
Hydrogen Production Rate ◽  
Fermentation Time ◽  
The Third ◽  
Cod Removal Rate ◽  
Substrate Concentrations

The aim of this research was to find out the effect of substrate concentrations (COD) of vinasse and the length of fermentation time to bio-hydrogen gas production using agent fermentation of photosynthetic bacteria, Rhodobium marinum. The production of bio-hydrogen was examined by varying COD of vinasse (10,000; 20,000; 30,000; 40,000; 50,000 mg COD/L) at certain fermentation time in the third, sixth and ninth day. The highest Hydrogen gas was obtained at ninth day of fermentation (82.66±18.6 mL). The highest Hydrogen Production Rate (HPR) and COD removal rate were obtained at concentration 50,000 mg COD/L, namely 109.98 mL H2/L/d and 1437.66 mg COD/L/d, respectively. Thus it can be concluded, the concentration of substrates (COD) from vinasse and the length of fermentation time have an effect on production of bio-hydrogen gas using Rhodobium marinum

Upgrading of Anaerobic Digestion Processes for Night Soil

1986 ◽  
Vol 18 (7-8) ◽  
pp. 249-256 ◽  
Author(s):  
T. Noike ◽  
J. Matsumoto
Keyword(s):  
Anaerobic Digestion ◽  
Removal Rate ◽  
Field Investigation ◽  
Gas Production ◽  
Cod Removal ◽  
Two Phase ◽  
Anaerobic Digesters ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Cod Removal Rate

The upgrading of night soil anaerobic digestion processes was studied by field investigation of the performance of anaerobic digesters in existing night soil treatment plants and by serai-continuous experiments with bench-scale digesters. Both the average monthly amount of collected night soil fed to a digester and the concentration of volatile solids in night soil increased in winter. A good correlation was found to exist between gas production and digestion temperature. The COD removal rate in the first digester was markedly higher than that in the second digester. The stirring period in the first digester in one plant differs from that in the other plant. Stirring the first digester for too long a period reduces the rate of COD removal by the second digester in the two-stage anaerobic digestion process. The first digester should be stirred for more than one hour per day in order to promote gas production. Gas production and CODCr removal rate in the second digester were hardly affected by reductions in retention time ranging from 15 days to 5 days. As night soil contains a large amount of cellulose and other refractory organics, some kind of pretreatment of the night soil fed to the digester may be necessary for the promotion of acidogenesis in the two-phase anaerobic digestion process.

Flocculation, Anaerobic and Microaerobic Treatment Process of Normal Temperature Low Concentration Domestic Sewage

2012 ◽  
Vol 518-523 ◽  
pp. 2530-2534
Author(s):  
Li Jun Nie ◽  
Hua Wen Zhong ◽  
Mei Huang ◽  
Xu Dong Yin
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Anaerobic Treatment ◽  
Domestic Sewage ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Low Concentration ◽  
Cod Removal Rate

Domestic sewage was treated by adopting flocculation, anaerobic and microaerobic combined process under normal temperature. The result demonstrates: total hydraulic retention time is 5.5h (chemical flocculation 1.0h, UASB reactor 2.0h and MUSB reactor 2.5h). UASB reactor can achieve anaerobic sludge granulation under normal temperature and is fairly feasible for low concentration domestic sewage treatment. Compared with single stage UASB reactor, hydraulic retention time of flocculation-UASB combined technique reduces from 4h to 2h. COD removal rate rises from 45% to 50%-60% and suspended COD is mainly removed. DO of microaerobic MUSB technique after anaerobic treatment is 0.2mg/L-0.5mg/L with air and water ratio of 1:1. Effluent quality is stable, in accordance with first standard of Synthetical Draining Standard of Sewage, GB8978—1996.

Build and Apply of Granular Sludge Enriched by Phosphorus Accumulating Organisms

2012 ◽  
Vol 535-537 ◽  
pp. 2394-2399
Author(s):  
Dong Chen Na
Keyword(s):  
Phosphorus Removal ◽  
Removal Rate ◽  
Granular Sludge ◽  
Cod Removal ◽  
Experimental Results ◽  
Biological Phosphorus Removal ◽  
Removal Process ◽  
Cod Removal Rate ◽  
The Stability ◽  
Biological Phosphorus

Based on the previous studies ,A/O technics culture granular sludge both with rich PAOs in the traditional SBR reactor. The experimental results show that: In the stability run-time of granules sludge system NH+4-N 、PO4-P and COD removal rate could reach 95% ,82%and 93%. This paper further discusses the characteristics of biological phosphorus removal process.

Operating Characteristic of IC Reactor Treating Wastewater of Sweet Potato Starch

2011 ◽  
Vol 374-377 ◽  
pp. 905-908
Author(s):  
Ling Feng Zhu ◽  
Yi Ping Guo ◽  
Dou Dou Huang ◽  
Yan'e Tian ◽  
Li Li Liu
Keyword(s):  
Sweet Potato ◽  
Removal Rate ◽  
Potato Starch ◽  
Granular Sludge ◽  
Cod Removal ◽  
Effect Of Temperature ◽  
Operating Characteristics ◽  
System Temperature ◽  
Sweet Potato Starch ◽  
Cod Removal Rate

The operating characteristics of IC reactor were studied when wastewater of sweet potato starch was utilized to domesticate the granular sludge. The effect of temperature on the treatment of sweet potato starch wastewater using IC reactor was specially researched. Results showed that the COD removal rate improved gradually in the process of the granular sludge in the IC reactor was domesticated by wastewater of sweet potato starch, and the activity of granular sludge also increasingly recovered. When the domestication was finished, the volume loading rate and the COD removal rate could attain 21.9kgCOD/ (m3 •d) and 84%, respectively. When the system temperature was between 29～35°C,the COD removal rate could be above 80%. However, when the temperature decreased, the COD removal rate reduced sharply.

Study on the Kitchen Residues and Cattle Manure Anaerobic Co-Digestion in Bench-Scale Laboratory Test

2012 ◽  
Vol 260-261 ◽  
pp. 621-626
Author(s):  
Xin Ke ◽  
Xin Zhao ◽  
Ying Sun ◽  
Yun Zhang
Keyword(s):  
Comparative Research ◽  
Anaerobic Fermentation ◽  
Raw Materials ◽  
Removal Rate ◽  
Gas Production ◽  
Cod Removal ◽  
Cattle Manure ◽  
Batch Type ◽  
Cod Removal Rate ◽  
Optimal Effect

With kitchen residues and cattle manure as raw materials, in temperature (36±1°C) adopt the way of the batch type fermented for kitchen residues and cattle manure, we will have a comparative research between independent anaerobic fermentation and mixed anaerobic fermentation. The results of the experiments show that the gas production and COD removal rate by the anaerobic fermentation of cattle manure independent would be superior to kitchen residues, the optimal effect is the anaerobic fermentation of kitchen residues mixed with cattle manure in all aspects .In this experiment all the kitchen residues are rice, vegetables, meat, eggs and other food all that have been after cooked, containing a large number of fat and salt, such condition is not suitable for the growth of microorganism. The time of gas production is only nine days and gas production rate is extremely low, only 1500ml accumulative gas production, But cattle manure’s accumulative gas production is 3028ml, COD removal rate was 21%, COD removal rate by mixed anaerobic fermentation of kitchen residues and cattle manure can achieve 60.92%.

scholarly journals Treatment of Cheese Whey Wastewater Using an Expanded Granular Sludge Bed (EGSB) Bioreactor with Biomethane Production

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 931
Author(s):  
Abumalé Cruz-Salomón ◽  
Edna Ríos-Valdovinos ◽  
Francisco Pola-Albores ◽  
Selene Lagunas-Rivera ◽  
Rosa Isela Cruz-Rodríguez ◽  
...  
Keyword(s):  
Cheese Whey ◽  
Negative Impact ◽  
Removal Rate ◽  
Granular Sludge ◽  
Organic Load ◽  
Biochemical Methane Potential ◽  
Stable Conditions ◽  
Methane Potential ◽  
Biomethane Production ◽  
Cod Removal Rate

Cheese whey wastewater (CWW) is the major by-product of the dairy industry. CWW is produced in large quantities, has varied characteristics and is usually disposed of. The disposal of CWW causes a negative impact on the environment of different agroindustrial areas due to the physic-chemical composition that significantly increases its high organic load and nutrients. For this reason, the aim of this work was to carry out an evaluation of the anaerobic treatability of an Expanded Granular Sludge Bed (EGSB) bioreactor as a new sustainable alternative for treatment of these effluents with bioenergy production. In this study, the bioreactor was operated under stable conditions (i.e., buffer index of 0.23 ± 0.1, pH 7.22 ± 0.4 and temperature 26.6 ± 1.4 °C) for 201 days. During evaluation the hydraulic retention time (HRT) was 6 and 8 days, and it was buffered with NaHCO3. At these conditions, the COD removal rate and biochemical methane potential (BMP) were 90, 92%; and 334, 328 mLCH4/gCOD, respectively. The evidence found in this study highlighted that the CWW is a viable substrate to be treated in the EGSB bioreactor as long as it keeps buffered. Furthermore, the process to treat the CWW in an EGSB bioreactor can be a sustainable alternative to simultaneously solve the environmental pollution that this agro-industry confronts and produce renewable and environmentally-friendly bioenergy.

Sign in / Sign up

Export Citation Format

Share Document