Studies on the Performance of Biofilm-MBR

2014 ◽  
Vol 1030-1032 ◽  
pp. 396-399
Author(s):  
Wei Hong Jin ◽  
Cai Ling He ◽  
Feng Gao ◽  
Chen Li
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Membrane Fouling ◽  
Control Method ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Treatment Performance ◽  
Biological Denitrification ◽  
Pollutants Removal

MBR technology for sewage treatment has the advantages of high volumetric load, good treatment performance and so on. But the MBR technology also has the shortage of membrane fouling. So this study selected the control method of fixing combination packing added in the MBR reactor, so as to reduce the membrane pollution, at the same time in the reactor to create the environment of coexistence of anaerobic and aerobic for biological denitrification. Through the research of the pollutants removal efficiency and the membrane pollution, it was founded that this method can remove 85-95% of COD and ammonia nitrogen. Effluent COD concentration generally is about 25mg/L, and the minimum of it is less than 10 mg/L. Effluent ammonia nitrogen is generally less than 10 mg/L. The minimum effluent concentration of ammonia nitrogen was less than 1 mg/L. The removal rate of total phosphorus was between 30-45%.

Different pollutants removal efficiencies and pollutants distribution with particle size of wastewater treated by CEPT process

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
G. R. Xu ◽  
Y. P. Zhang ◽  
J. Gregory
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Total Phosphorus ◽  
Primary Treatment ◽  
Ammonia Nitrogen ◽  
Cellulose Esters ◽  
Effective Removal ◽  
Pollutants Removal ◽  
Chemically Enhanced Primary Treatment ◽  
Very High

The removal efficiency of different pollutants of wastewater treated by Chemically Enhanced Primary Treatment (CEPT) process and pollutants distribution with particle size were studied in this paper. The distributions of contaminants with particle size were studied using synthetic cellulose esters micro-porous filtering membrane of different porous size to separate the wastewater and samples after coagulation in sequence. Turbidity, UV254, COD, total phosphorus and ammonia nitrogen of the samples were measured. The results showed that the removal efficiency of the pollutants and their distributions with particle size were closely related. For contaminants in wastewater associated with particles larger than 1.2µm, the removal efficiency was very high; on the contrary, it was difficult for CEPT to remove particles smaller than 0.2µm. The removal capabilities of CEPT also correlate to the pollutants characteristics. Therefore CEPT had effective removal efficiency for total phosphorus and pollutants associated with particles larger than 1.2µm.

Exploring Research on Raschig Rings/Ceramic Double-Packed BAF

2012 ◽  
Vol 598 ◽  
pp. 556-560
Author(s):  
Xiao Mei Lv ◽  
Ji Li ◽  
Zhen Jiang Zhang ◽  
Xin Lei Gao
Keyword(s):  
Removal Efficiency ◽  
Cycle Time ◽  
Removal Rate ◽  
Test Period ◽  
Nitrifying Bacteria ◽  
Stable Operation ◽  
Treatment Performance ◽  
Packed Layer ◽  
Pollutants Removal ◽  
Operation Cycle

A BAF double packed with Raschig rings/ceramic media was developed to determine its pollutants removal efficiency with less frequent backwashing as compared with ordinary BAF. Results showed that a stable operation was achieved during the entire test period and the backwashing cycle time could be extended as well. The COD and SS removals of 57% and 52%, respectively, could be achieved by the Raschig rings packed layer. Nitrifying bacteria accounted for as much as 95% in the ceramic packed layer and ensured high nitrification efficiency with a removal rate of 40.2 gNH4+-N/h•m3. With wastewater pretreatment and backwashing of the packed Raschig rings, the operation cycle of double-packed BAF could be extended to 16 days. In addition, the recovery of treatment performance was fairly rapid after backwashing.

COD removal efficiency and mechanism of HMBR in high volumetric loading for ship domestic sewage treatment

2016 ◽  
Vol 74 (7) ◽  
pp. 1509-1517 ◽  
Author(s):  
Linan Zhu ◽  
Hailing He ◽  
Chunli Wang
Keyword(s):  
Removal Efficiency ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Oxygen Demand ◽  
Domestic Sewage ◽  
Cod Removal ◽  
Aeration Tank ◽  
Remarkable Effect ◽  
Cod Removal Efficiency ◽  
Volumetric Loading

The hybrid membrane bioreactor (HMBR) has been applied in ship domestic sewage treatment under high volumetric loading for ship space saving. The mechanism and influence factors on the efficiency, including hydraulic retention time (HRT), dissolved oxygen (DO) of chemical oxygen demand (COD) removal were investigated. The HMBR's average COD removal rate was up to 95.13% on volumetric loading of 2.4 kgCOD/(m3•d) and the COD concentration in the effluent was 48.5 mg/L, far below the International Maritime Organization (IMO) discharge standard of 125 mg/L. DO had a more remarkable effect on the COD removal efficiency than HRT. In addition, HMBR revealed an excellent capability of resisting organics loading impact. Within the range of volumetric loading of 0.72 to 4.8 kg COD/(m3•d), the effluent COD concentration satisfied the discharge requirement of IMO. It was found that the organics degradation in the aeration tank followed the first-order reaction, with obtained kinetic parameters of vmax (2.79 d−1) and Ks (395 mg/L). The original finding of this study had shown the effectiveness of HMBR in organic contaminant degradation at high substrate concentration, which can be used as guidance in the full scale of the design, operation and maintenance of ship domestic sewage treatment devices.

Study on the Alage Removal by Microwave Irradiation

2010 ◽  
Vol 113-116 ◽  
pp. 87-90
Author(s):  
Qing Jie Xie
Keyword(s):  
Activated Carbon ◽  
Microwave Irradiation ◽  
Removal Efficiency ◽  
Oxidation Process ◽  
Removal Rate ◽  
Treatment Efficiency ◽  
Dynamic Reaction ◽  
Initial Concentration ◽  
First Order ◽  
Pollutants Removal

The microwave irradiation (MI) was found that it had significantly treatment efficiency for pollutants removal. It was developed to treat the alage in this paper. The granular activated carbon (GAC) was used as catalyst. The effect of the acting time, MI power, GAC amount and the initial concentration on alage removal were studied. The results showed: with the increasing of the acting time, MI power, GAC amount the alage removal rate were increased, but the effect of the initial concentration to alage removal was opposite; the optimum value of acting time, MI power and GAC amount were 5min, 450W and 3g respectively with the alage removal efficiency reached up to 100%. It also showed that with the alage removed under the MI the COD, SS were removed too. It was discovered that the oxidation process was basically in conformity with the first-order dynamic reaction(ln(C/C0)＝-0.9371t+0.6744（R2=0.9472）).

Sewage Treatment Performance of Biological Aerated Filters with Fe-Containing Compound Clinoptilolite Media

2015 ◽  
Vol 737 ◽  
pp. 579-583
Author(s):  
Hui Mu ◽  
Yu Xiao Zhao ◽  
Min Tian Gao ◽  
Xiao Dong Zhang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Ferric Ions ◽  
Pore Connectivity ◽  
Adsorption Effect ◽  
Broad Application ◽  
Treatment Performance ◽  
Natural Clinoptilolite ◽  
Application Prospects

Fe-containing compound clinoptilolite media (Fe-M), prepared with natural clinoptilolite, was applied to be the filter media of BAF, and then the treating performance of sewage by BAFs with Fe-M and ceramsite were investigated. Because Fe-M had relatively larger surface area, better pore connectivity, higher biofilm microbial biomass, and the ion-exchanging and adsorption effect, a higher ammonia nitrogen removal efficiency was obtained in BAF with Fe-M than ceramsite; and higher phosphorus removal in BAF with Fe-M was also realized by the adsorption and precipitation effect of the leaching ferric ions. Fe-M is more suitable to be used as the filter of BAF to treat sewage wastewater than ceramsite, which has a high value of broad application prospects and engineering popularization value.

Study on Treatment of Sewage from Channel Discharge with Biological Accelerator-Biofilm Process

2011 ◽  
Vol 183-185 ◽  
pp. 644-648
Author(s):  
Gai Mei Guo ◽  
Hui Fen Qin
Keyword(s):  
Treatment Effect ◽  
Treatment Process ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Ammonia Nitrogen ◽  
Promoting Effect ◽  
Research Results ◽  
The Difference ◽  
Biofilm Process

This paper studied treatment of sewage from channel discharge with biological accelerator-biofilm process, and investigated the promoting effect of biological accelerator on biofilm process during the sewage treatment process. Meanwhile, compared the difference between the laboratory developed compounded enzyme and the foreign composite enzyme. The research results indicated that using biofilm process, the composite enzyme-biofilm process and the compounded enzyme-biofilm process for treating sewage, the removal rate of CODcr was separately 70.5%, 78.4% and 74.0% and that of ammonia nitrogen was separately 38.2%, 48.6% and 45.9%, which accounted for that under the strengthening action of biological accelerator, the treatment effect was remarkable for using biofilm process disposing channel disordered discharge sewage. Furthermore, the promoting effect of the compounded enzyme was equivalent to that of the composite enzyme for biofilm process, and the compounded enzyme could come into use instead of the composite enzyme.

Effects of chemical oxygen demand (COD)/N ratios on pollutants removal in the subsurface wastewater infiltration systems with/without intermittent aeration

2016 ◽  
Vol 73 (11) ◽  
pp. 2662-2669 ◽  
Author(s):  
Siyu Song ◽  
Jing Pan ◽  
Shiwei Wu ◽  
Yijing Guo ◽  
Jingxiao Yu ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Oxygen Deficiency ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Intermittent Aeration ◽  
Oxidation Reduction ◽  
The Matrix ◽  
Pollutants Removal

The matrix oxidation reduction potential level, organic pollutants and nitrogen removal performances of eight subsurface wastewater infiltration systems (SWISs) (four with intermittent aeration, four without intermittent aeration) fed with influent chemical oxygen demand (COD)/N ratio of 3, 6, 12 and 18 were investigated. Nitrification of non-aerated SWISs was poor due to oxygen deficiency while higher COD/N ratios further led to lower COD and nitrogen removal rate. Intermittent aeration achieved almost complete nitrification, which successfully created aerobic conditions in the depth of 50 cm and did not change anoxic or anaerobic conditions in the depth of 80 and 110 cm. The sufficient carbon source in high COD/N ratio influent greatly promoted denitrification in SWISs with intermittent aeration. High average removal rates of COD (95.68%), ammonia nitrogen (NH4+-N) (99.32%) and total nitrogen (TN) (89.65%) were obtained with influent COD/N ratio of 12 in aerated SWISs. The results suggest that intermittent aeration was a reliable option to achieve high nitrogen removal in SWISs, especially with high COD/N ratio wastewater.

Tertiary treatment of municipal wastewater using bioflocculating micro-algae

1991 ◽  
Vol 18 (6) ◽  
pp. 940-944 ◽  
Author(s):  
J. B. Sérodes ◽  
E. Walsh ◽  
O. Goulet ◽  
J. de la Noue ◽  
C. Lescelleur
Keyword(s):  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Ammonia Nitrogen ◽  
Design Criteria ◽  
Tertiary Treatment ◽  
Deep Basin ◽  
Sequential Batch Reactor ◽  
N Removal

Design criteria of a pilot plant for treating secondary municipal effluents using filamentous, bioflocculating micro-algae were evaluated. Using a sequential batch reactor, the best removal rate of ammonia nitrogen was reached for 25% draw volume; at 20–22 °C, up to four cycles per day could be achieved giving a removal efficiency of approximately 2 g of N per day and per square meter of basin (200 mm deep) with negligible nitrogen residual; increasing the water level by increments of 200 mm (from 200 to 600 mm) increased the N removal efficiency in a way similar to an increase in the number of renewals per day on a 200 mm deep basin. The dominant micro-algae (Chlorhormidium) was heavily influenced by the water temperature. Key words: micro-algae, municipal wastewater, water treatment, ammonia nitrogen, removal rate, removal efficiency.

scholarly journals REMOVAL OF TOTAL PHOSPHORUS FROM MUNICIPAL WASTEWATER USING CYLINDRICAL ALUMINUM ELECTRODE IN CONTINUOUS MODE

2018 ◽  
Vol 54 (4B) ◽  
pp. 88
Author(s):  
Tran Tuan Viet
Keyword(s):  
Removal Efficiency ◽  
Total Phosphorus ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Sewage Treatment ◽  
Aluminum Electrode ◽  
Continuous Mode ◽  
Nacl Concentration ◽  
Electro Coagulation ◽  
P Removal

This study aimed to apply electro-coagulation method using cylindrical Aluminum electrode in continuous mode to remove total phosphorus (T-P) in municipal wastewater. The effects of NaCl concentration (or conductivity) and hydraulic retention time (HRT, or flow rate) on T-P removal efficiency were investigated. To determine the efficiency of this system the ratio Al consumption/T-P removal was also considered. The results showed that, with raw sewage as influent, HRT = 1.17 min and added NaCl = 0.04 % was found the best conditions for the highest T-P removal efficiency (92.80 %; T-P concentration remainder was 0.17 mg/L) and the ratio Al consumption/T-P removal was 5.0. In general, this method achieves a high efficiency of removing phosphorus from wastewater and it can be used in sewage treatment systems.

scholarly journals Evaluation of four different coagulants used for chemical dephosphorization of membrane bioreactor effluent

2020 ◽  
Vol 167 ◽  
pp. 01009
Author(s):  
Qin Cai ◽  
Hui-qiang Li ◽  
Ping Yang
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Continuous Flow ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Sewage Treatment ◽  
Chemical Reactor ◽  
Domestic Sewage ◽  
Internal Loop ◽  
Polyaluminium Chloride

A continuous flow chemical reactor was constructed to study the dephosphorization effect on the effluent of the oxygen-limited internal-loop fluidized membrane bioreactor (IF-MBR) for domestic sewage treatment. Removal effect of total phosphorus (TP) by four coagulants of AlCl3, FeCl3, polyaluminum ferric chloride (PAFC) and polyaluminium chloride (PAC) was evaluated. Results showed that when the ratio of coagulants to TP was 5 (coagulants in terms of Fe and Al), the removal efficiency of TP by FeCl3 was 92.5% and the addition of FeCl3 resulted in an increase in the chromaticity of the effluent. PAC and PAFC had good removal of TP, and the removal percentage achieved 96.2 and 97.4, respectively. However, the flocs they produced were small and light, and the performance in settlement was poor. AlCl3 performed well as a phosphorus removal agent, the removal rate of TP reached 97.4%, and the flocs were large and dense. Based on this, AlCl3 was the best choice for IF-MBR and then the experiment further optimized the Al/P ratio. Results showed that when the Al/P ratio was above 1:1, the effluent TP concentration was lower than 1mg/L; when the ratio was higher than 2.5:1, the effluent TP was lower than 0.5mg/L.

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