Study on the Performance of Modified UASB Process Treating Sewage

2012 ◽  
Vol 610-613 ◽  
pp. 2174-2178 ◽  
Author(s):  
Su Juan Zhang ◽  
Nai Rui Liu ◽  
Cong Xiao Zhang
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ph Value ◽  
Domestic Sewage ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Reactor Operation ◽  
Influent Concentration ◽  
Contact Oxidation ◽  
The Stability

Added the anaerobic contact oxidation fill area on traditional UASB reactor,the imitation domestic sewage was treated by this modified UASB process on this paper. The COD removal was studied by regulated temperature,hydraulic retention time(HRT) and the influent concentration; The stability of this reactor was studied by regulated pH value of inflow and effluent.The results show that,when regulated the inflow pH value about 7.5,and effluent pH by maintainned about 6.8-7.2,so ensure that the reactor operation was stable;when T=45±5°C,the COD removal can reach 92.8%; when the HRT was 10h,the COD removal is 76.8%~92%;when the inflow concentration were 500mg/L,750mg/L,1000mg/L,the average COD removal are 65.68%, 75.58% and 83.05%.

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.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

Long-term performance of a UASB reactor treating acid mine drainage: effects of sulfate loading rate, hydraulic retention time, and COD/SO42− ratio

2018 ◽  
Vol 30 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Mirabelle Perossi Cunha ◽  
Rafael Marçal Ferraz ◽  
Giselle Patrícia Sancinetti ◽  
Renata Piacentini Rodriguez
Keyword(s):  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Mine Drainage ◽  
Uasb Reactor ◽  
Acid Mine ◽  
Long Term Performance ◽  
Term Performance

Research for Treating Avermectin Wastewater with UASB Technique

2011 ◽  
Vol 356-360 ◽  
pp. 1281-1284
Author(s):  
Yan Hong Chang ◽  
Hui Tao Feng ◽  
Hui Luo ◽  
San Jian Ma
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Cod Removal ◽  
Stable Phase ◽  
Volume Load ◽  
Cod Removal Rate

The avermectin wastewater was treated with UASB technique. The paper was focused mainly on the removal rate of COD and the change of ammonia nitrogen of influent and effluent wastewater in the first running stage. At the stable phase of anaerobic operation, the removal rate of COD could be stabilized at 85% when the influent volume load was 9.21 kg/(m3•d), and the effluent COD was about 1400 mg/L. As for ammonia nitrogen concentration of influent and effluent wastewater, in the first 50 days, the former was larger than the latter, after then, it was opposite. In the condition of same volume load but different hydraulic retention time (COD concentration of influent being different), COD removal rate kept almost the same. In the second running stage, the influent COD volume load reached 9.21 kg/(m3•d) at the 16th day, with the COD removal rate being around 87%.

Start-up and steady-state results of a full-scale UASB reactor treating malting wastewater

2006 ◽  
Vol 54 (2) ◽  
pp. 261-267 ◽  
Author(s):  
L. Borzacconi ◽  
I. López ◽  
M. Passeggi
Keyword(s):  
Loading Rate ◽  
Biogas Production ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Yield Coefficient ◽  
Reactor Operation ◽  
Operation Temperature ◽  
Start Up ◽  
Anaerobic Lagoon

An Imhoff tank was reconstructed into a 250 m3 UASB reactor in order to treat a malting plant wastewater. The UASB was inoculated with sludge from an anaerobic lagoon used for slaughterhouse wastewater treatment. After two months of operation the reactor achieved full load with an HRT of 17 h, a COD removal higher than 80% and a biogas production of 300 m3/day (77% average methane content), with an organic loading rate of 3.6 kgCOD/m3.d (0.24 kgCOD/kgVSS.d). A yield coefficient of 0.09 gVSS/gCODrem was found from a mass balance. The fat present in the inoculated sludge (48 mg/gSSV) did not affect the start up performance. Sludge from the inoculum with high content of fat (270 mg/gSSV), was separated by flotation in the first week of operation. The COD removal efficiency was scarcely influenced by the reactor operation temperature (17–25 °C).

Effect of hydraulic retention time (HRT) on pentachlorophenol (PCP) and COD removal in a pilot GAC-SBBR system for the post-treatment of recycled paper mill wastewater

2012 ◽  
Vol 48 (1-3) ◽  
pp. 50-59 ◽  
Author(s):  
Mohd Hafizuddin Muhamad ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Abu Bakar Mohamad ◽  
Rakmi Abdul Rahman ◽  
Abdul Amir Hasan Kadhum
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Paper Mill ◽  
Post Treatment ◽  
Cod Removal ◽  
Recycled Paper ◽  
Paper Mill Wastewater

scholarly journals Perencanaan Septic Tank Skala Rumah Tangga Untuk Penanganan Air Limbah

2018 ◽  
Vol 3 (2) ◽  
pp. 21-24
Author(s):  
Rudy Yoga Lesmana
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Cod Removal ◽  
Septic Tank ◽  
Cod Removal Rate ◽  
Bod Removal

Air limbah yang dihasilkan dari kegiatan rumah tangga jika tidak dikelola dengan baik maka akan menimbulkan masalah yang serius bagi lingkungan. Salah satu solusi dalam mengatasi permasalahan air limbah, yang ada di Indonesia yaitu dengan menggunakan septic tank. Septic tank umum digunakan di Indonesia karena menggunakan prinsip anaerob, yang hanya dibuat kemudian dibiarkan saja, tanpa perawatan yang rutin, dan jika ingin operasionalnya optimal maka perlu dikuras dengan jangka waktu 1 kali dalam setahun. Penelitian ini bertujuan untuk mengetaui Perkiraan kualitas dari effluent (BOD & COD) septic tank dan Berapa kapasitas volume dari septic tank untuk rumah tempat tinggal. Metode penelitian Besaran air limbah yang dihasilkan dari kegiatan rumah tangga menuju septic tank menurut Jayanudin (2016), adalah sebesar 120 L/hari atau 0,12 m3/hari dengan jumlah anggota keluarga ideal yaitu 5 orang. Dalam penelitian ini, air limbah mengalir selama 12 jam yang berasal dari kegiatan rumah tangga. Kadar COD yang dihasilakan Effluent pada septic tank ini adalah sebesar 207 mg/ltr dan COD Removal rate sebesar 31,5%, sedangkan Kadar BOD yang dihasilkan Effluent pada septic tank ini sebesar 411 mg/l dan BOD removal rate sebesar 31,5%. Untuk Akumulasi Volume lumpur yang dihasilkan selama 2 tahun (24 Bulan) adalah sebesar 0,081m3. Penurunan volume lumpur/sludge pada septic tank sebesar 68% atau Setelah 24 bulan volume lumpur menjadi 0,055 m3, semakin lama waktu penyimpanan lumpur di septic tank maka volumenya akan semakin berkurang. Volume septic tank yang dibutuhkan untuk menginapkan limbah selama 15 jam adalah sebesar 0,075, Semakin lama waktu Hydraulic retention time (HRT)/waktu tinggal limbah, maka akan semakin baik penguraian mikroorganisme dalam septic tank serta sebaliknya, semakin singkat waktu HRT maka proses penguraiannya samakin tidak baik.

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