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.

Low temperature treatment of domestic sewage in upflow anaerobic sludge blanket and anaerobic hybrid reactors

1999 ◽  
Vol 39 (5) ◽  
pp. 177-185 ◽  
Author(s):  
Tarek A. Elmitwalli ◽  
Marcel H. Zandvoort ◽  
Grietje Zeeman ◽  
Harry Bruning ◽  
Gatze Lettinga
Keyword(s):  
Low Temperature ◽  
Sewage Treatment ◽  
Average Diameter ◽  
Anaerobic Treatment ◽  
Domestic Sewage ◽  
Cod Removal ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Removal Efficiencies

The treatment of sewage at a temperature of 13°C was investigated in three reactors (each 3.84 litre) a UASB and two anaerobic hybrid (AH) reactors with small sludge granules with an average diameter of 0.73 mm. The media used in the AH reactors were vertical polyurethane foam sheets. The reactors were operated at a HRT of 8 h. The use of small sludge granules and operating the reactors at low upflow velocity (1.8 m/d) improved suspended COD removal efficiencies for the UASB reactor. Moreover, the use of sheets in the AH reactors significantly increased suspended COD removal efficiencies as compared to the UASB and reached to 87% for pre-settled sewage treatment. The treatment of pre-settled sewage instead of raw sewage in AH reactors significantly increased colloidal and dissolved COD removal efficiencies with 13% and 12% respectively and colloidal COD removal efficiency for the UASB reactor with 13%. At ‘steady state’ for pre-settled sewage treatment, the AH reactors removed 64% of the total COD which is significantly higher by 4% than the UASB reactor. Therefore, the anaerobic treatment of domestic sewage at low temperature can be improved by treating pre-settled sewage in shallow AH reactors containing small sludge granules.

Study on Domestic Sewage Treatment with Rotating Biological Contactor

2012 ◽  
Vol 178-181 ◽  
pp. 376-379
Author(s):  
Fang Li ◽  
Zeng Lu Qi
Keyword(s):  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Operating Parameters ◽  
Good Prospect ◽  
Rotating Biological Contactor

This paper adopted a 3-stage rotating biological contactor (RBC), while the operating parameters could be controlled properly, this kind of RBC can obtain better removal effect in domestic sewage treatment. At 25oC, when hydraulic retention time (HRT) is 4h ,6h,8h,10h and 12h ,removal rate of COD is 65.14%,86.10%,89.82%,85.93% and 78.58%.HRT fixes on 8h, removal rate of NH3 –N is 75% after adjusting alkalinity. When rotating rate of RBC is 4,6,8,10,12 and 14 r/min, the removal rate of TN is 53.88%,56.78%,60.03%,58.49%,55.32% and 54.87%.RBC also has a good removal efficiency of TP and obtains the removal rate of TP 45%.There is good prospect in domestic sewage treatment with RBC.

scholarly journals Treatment of canned fish factory wastewater by upflow anaerobic sludge blanket (uasb) reactors

2015 ◽  
Vol 5 (1) ◽  
pp. 158
Author(s):  
Farshad Golbabaei Kootenaei ◽  
Gholamreza Darvishi ◽  
Mohammad Javad Bayani
Keyword(s):  
Removal Rate ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Canned Fish ◽  
Cod Removal Rate ◽  
Aeration Process ◽  
Anaerobic Sludge Blanket

<p>Application of UASB method for wastewater treatment of canned fish factory reduces the costs of pre-treatments processes such as neutralization, and also reduced the costs of final aeration process. In this study, an UASB reactor which was equipped with a 3-phase separator system has been used. At first, a complex of anaerobic digester sludge and return sludge of activated sludge was added to reactor with ratio of 25 to 15. Then, the wastewater of factory entered into the reactor with inlet Organic Loading Rate (OLR) of 0.5 kg/m3.day which was increased gradually up to 4 kg/m3.day. Then, sampling was done for various tests during 75 days. The results of this study showed that UASB method neutralized and reduced the pH of the inlet wastewater from 10.5 to 7.3; and also reduced the SS of the inlet wastewater from 43 gr/l to 8 gr/l. the COD removal rate of this method was around 87%.</p><p>Keywords: canned fish wastewater, anaerobic treatment, UASB, COD, OLR.</p>

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%.

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.

Removal efficiency and methanogenic activity profiles in a pilot-scale UASB reactor treating settled sewage at moderate temperatures

2002 ◽  
Vol 45 (10) ◽  
pp. 243-248 ◽  
Author(s):  
L. Seghezzo ◽  
R.G. Guerra ◽  
S.M. González ◽  
A.P. Trupiano ◽  
M.E. Figueroa ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Retention Time ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Granular Sludge ◽  
Pilot Scale ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Methanogenic Activity

The performance of a sewage treatment system consisting of a settler followed by an Upflow Anaerobic Sludge Bed (UASB) reactor is described. Mean ambient and sewage temperature were 16.5 and 21.6°C, respectively. Total Chemical Oxygen Demand (CODt) concentration averaged 224.2 and 152.6 mg/L, for raw and settled sewage, respectively. The effluent concentration was 68.5 mgCODt/L. Total and suspended COD removal efficiencies of approximately 70 and 80%, respectively, have been observed in the system at a mean Hydraulic Retention Time (HRT) of 2 + 5 h. Maximum COD removal efficiency was achieved in the UASB reactor when upflow velocity (Vup) was 0.43 m/h (HRT = 6 h). Mean Specific Methanogenic Activity (SMA) and Volatile Suspended Solids (VSS) concentration in the granular sludge bed were 0.11 gCOD-CH4/gVSS.d and 30.0 gVSS/Lsludge, respectively. SMA was inversely related to VSS concentration, and both parameters varied along the sludge bed height. The Solids Retention Time (SRT) in the reactor was 450 days. Sludge characteristics have not been affected by changes of up to one month in Vup in the range 0.28–0.85 m/h (HRT 3–9 h). This system or two UASB reactors in series could be an alternative for sewage treatment under moderate temperature conditions.

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.

Development of Technology for the Use of the UASB Reactor in Domestic Sewage Treatment

1986 ◽  
Vol 18 (12) ◽  
pp. 109-121 ◽  
Author(s):  
Sonia M. M. Vieira ◽  
Marcos E. Souza
Keyword(s):  
Steady State ◽  
Ambient Temperature ◽  
Initial Phase ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Domestic Sewage ◽  
Uasb Reactor ◽  
Technical Feasibility ◽  
Feasible Option ◽  
The Cost

The lack of a simple and economic option for the treatment of sewage created the need to develop and make the UASB reactor adequate for low strength wastes. Thus a UASB reactor with 106 ℓ capacity was built, which was specially designed for sewage treatment. Several treatability tests were conducted with raw and settled domestic sewage, with only A hours of hydraulic retention time. This proved the reactor's technical feasibility in treating raw sewage at ambient temperature in São Paulo. Based on these experiments, the reactor was scaled up to 120 m3 and built for the treatment of raw sewage at ambient temperature. The operation is in its initial phase, and good COD removals are already being observed, although steady state has not been achieved yet. Since the cost of the system was extremely low, it is a feasible option to be applied in this country.

Performance of Treating Domestic Sewage with Coagulation-Ultrafiltration System

2015 ◽  
Vol 737 ◽  
pp. 557-560
Author(s):  
Hui Yuan Zhong ◽  
Guan Yi Liu ◽  
Jun Xia Li ◽  
Hao Wang
Keyword(s):  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Sewage Treatment ◽  
Membrane System ◽  
Integrated Treatment ◽  
Domestic Sewage ◽  
Ultrafiltration Membrane ◽  
Cod Removal Rate ◽  
Organic Particles

This study used coagulation - ultrafiltration technology for domestic sewage treatment, which was used widely in water supply and secondary treatment with sewage, in order to achieve high efficiency, low-cost, integrated treatment of domestic sewage treatment. This article chooses fly ash coagulant is not only simple preparation process, low cost, and with the traditional aluminum chloride and ferric chloride coagulation effect. The research results show that the coagulation can make the organic particles size distribution to move to larger particles area and significantly reduce colloidal substance. Ultrafiltration membrane system can further remove the coagulation treatment failed to completely remove polymer and part in the process of low molecular substances, to achieve high organic matter removal efficiency. The backwash of ultrafiltration membrane can make membrane flux recovery by about 80%. This system of SS can remove more than 95%, COD removal rate can reach 60% ~ 70%.

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%.

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