External carbon feeding strategy for enhancing nitrogen removal in SBR

2004 ◽  
Vol 49 (5-6) ◽  
pp. 325-331
Author(s):  
B.H. Jun ◽  
K.M. Poo ◽  
J.H. Im ◽  
J.R. Kim ◽  
H.J. Woo ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Feeding Strategy ◽  
Swine Wastewater ◽  
Cycle Period ◽  
High Concentration ◽  
N Accumulation ◽  
Feeding Method ◽  
Raw Wastewater

Effective method for feeding an external carbon source (ECS) in SBR was investigated to enhance denitrification based on modifying the anoxic/aerobic sub-cycle for swine wastewater treatment. The wastewater discharged from the scraper-type barns contains relatively low readily biodegradable organic. Therefore NOx-N was accumulated during repeating sub-cycle in SBR operation. When acetic acid was fed as ECS during the final sub-cycle, the maximum nitrogen removal rate was 0.22 kg N/m3/d. This was due to both less denitrification rate during the sub-cycle period and inhibition of denitrification by pH drop during the final cycle. The pH drop was caused by a large amount of ECS feeding to remove high concentration of NOx-N in the final period. To overcome these limitations and achieve higher nitrogen removal rate, the intermittent ECS feeding method with raw wastewater at every anoxic period was developed. Using the modifying ECS feeding method, the removal rate was increased to 0.45 kg N/m3/d without NOx-N accumulation.

High-Concentration Nitrogen Removal by Anaerobic Ammonium Oxidation Process

2012 ◽  
Vol 518-523 ◽  
pp. 214-217
Author(s):  
Tao Hong Liao ◽  
Kang Huai Liu ◽  
Jia Chun Yang ◽  
Kenji Furukawa
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Ammonium Oxidation ◽  
High Concentration ◽  
Total Nitrogen Concentration ◽  
Load Rate ◽  
Nitrogen Load Rate

This experiment aimed to explore the effect of high- concentration nitrogen removal by Anaerobic ammonium oxidation process. The mixed liquor suspended solid(MLSS)was 510 mg/L. In the beginning of the experiment, the inflow concentration rate of ammonia nitrogen and nitrite nitrogen was about 1:1.3 and the total nitrogen concentration was low. When the reactor reached the ideal treatment effect then gradually increased the total nitrogen concentration, until reaching the maximum nitrogen load rate(NLR) of the reactor. In the temperature of 34.4 °C, PH was 7.23, the inflow concentration of ammonia nitrogen was 223.3 mg. N/L, the inflow concentration nitrite nitrogen was 289.7 mg. N/L, the dissolved oxygen (DO) was 2.3 mg. N/L, the nitrogen load rate (NLR) was 6.08 kg. N / (m3. d), the nitrogen removal rate (NRR) was 5.60 kg. N / (m3. d), the total nitrogen (TN) removal rate was 92.2%, under this conditions, the reactor achieved the best effect.

Characteristics during Start-Up of Internal Circulation Reactor

2012 ◽  
Vol 573-574 ◽  
pp. 218-222
Author(s):  
Qiong Liu ◽  
Jing Wang
Keyword(s):  
Removal Rate ◽  
Granular Sludge ◽  
Stable Operation ◽  
Treatment Efficiency ◽  
High Concentration ◽  
Internal Circulation ◽  
Start Up ◽  
Operation Results ◽  
High Treatment ◽  
Raw Wastewater

Lactic wastewater is a refractory high-concentration organic wastewater,and its treatment efficiency with traditional anaerobic processes is not high.The internal circulation(IC) reactor was used to treat this wastewater.It was successfully started up by taking measures including inoculating granular sludge,controlling the influent concentration,flow rate,VFA and temperature. The operation results show that IC reactor has high treatment efficiency and stable operation in treatment of lactic wastewater, and the removal rate of COD can reach 80%, thus reducing the treatment loads of subsequent aerobic processes, and ensuring that the effluent from the whole wastewater treatment system reaches second level criteria specified in the Integrated Wastewater Discharge Standard (GB8978-1996).The biogas produced in the IC reactor can be used for heating the raw wastewater.

Ammonium nitrogen removal from slurry-type swine wastewater by pretreatment using struvite crystallization for nitrogen control of anaerobic digestion

2004 ◽  
Vol 49 (5-6) ◽  
pp. 215-222 ◽  
Author(s):  
B.U. Kim ◽  
W.H. Lee ◽  
H.J. Lee ◽  
J.M. Rim
Keyword(s):  
Phosphoric Acid ◽  
Magnesium Oxide ◽  
Nitrogen Removal ◽  
High Capacity ◽  
Ammonium Nitrogen ◽  
Swine Wastewater ◽  
Molar Ratio ◽  
High Concentration ◽  
Nitrogen And Phosphorus ◽  
Struvite Crystallization

Precipitation of ammonium together with phosphate and magnesium is a possible alternative for lowering the nitrogen content of wastewater. In this study we examine the removal of ammonium nitrogen and phosphorus from slurry-type swine wastewater containing high concentrations of nutrients by the addition of phosphoric acid along with either calcium oxide or magnesium oxide, which leads to the crystallization of insoluble salts such as hydroxyapatite and struvite. The struvite crystallization method showed a high capacity for the removal of nitrogen when magnesium oxide and phosphoric acid were used as the magnesium and phosphate sources, respectively. When it was applied to swine wastewater containing a high concentration of nitrogen, the injection molar ratio of Mg2+:NH4+:PO43- that gave maximum ammonium nitrogen removal was 3.0:1.0:1.5.

scholarly journals Nitrogen Removal Characteristics of Pseudomonas putida Y-9 Capable of Heterotrophic Nitrification and Aerobic Denitrification at Low Temperature

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Yi Xu ◽  
Tengxia He ◽  
Zhenlun Li ◽  
Qing Ye ◽  
Yanli Chen ◽  
...  
Keyword(s):  
Low Temperature ◽  
Pseudomonas Putida ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Heterotrophic Nitrification ◽  
Oxidation Products ◽  
Aerobic Denitrification ◽  
Nitrification Rate ◽  
High Concentration ◽  
Nitrate And Nitrite

The cold-adapted bacterium Pseudomonas putida Y-9 was investigated and exhibited excellent capability for nitrogen removal at 15°C. The strain capable of heterotrophic nitrification and aerobic denitrification could efficiently remove ammonium, nitrate, and nitrite at an average removal rate of 2.85 mg, 1.60 mg, and 1.83 mg NL−1 h−1, respectively. Strain Y-9 performed nitrification in preference to denitrification when ammonium and nitrate or ammonium and nitrite coexisted in the solution. Meantime, the presence of nitrate had no effect on the ammonium removal rate of strain Y-9, and yet the presence of high concentration of nitrite would inhibit the cell growth and decrease the nitrification rate. The experimental results indicate that P. putida Y-9 has potential application for the treatment of wastewater containing high concentrations of ammonium along with its oxidation products at low temperature.

scholarly journals A Study on the Improvement of Nitrogen & Phosphorus Removal of a Sequence Batch Reactor with Internal Circulation and Multi-Step Addition

2020 ◽  
Vol 42 (5) ◽  
pp. 280-288
Author(s):  
Pul-Eip Lee ◽  
Duckhui Lee ◽  
Bum-Su Kim ◽  
Yuhoon Hwang ◽  
Tae-Jin Lee
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Batch Reactor ◽  
Nitrogen Concentration ◽  
Oxygen Control ◽  
Internal Circulation ◽  
Carbon Nitrogen Ratio ◽  
Nitrogen Ratio ◽  
Sequence Batch Reactor ◽  
Raw Wastewater

Objectives:The purpose of this study is to increase the denitrification and phosphorus removals by the oxygen control of the anaerobic or anoxic period using the circulation of the supernants through the settled sludge and multi-step addition of raw wastewater during the operation of the internal circulation sequence batch reactor (ICSBR).Methods:The internal circulation pipe at the bottom of SBR is installed to circulate the supernatant into the settled sludge layer to create anoxic condition of non-aeration period instead of a stirrer in a SBR. And it is attempted to develope the SBR that properly uses the organic materials of the raw wastewater as a carbon source by the feeding the raw wastewater at a suitable time of the reaction period.Results and Discussion:Dissolved oxygen (DO) concentration of the reactor decreases more rapidly with an internal circulation to which the uniform pressure division method is applied, increasing the efficiency of about 40%. As the multi-step addition of raw wastewater proceeds, the nitrogen concentration of effluent is lowered and the C/N (Carbon/Nitrogen) ratio is higher, the nitrogen removal rate is higher.Conclusions:Circulating the supernatant to the bottom through settle sludge was effected to properly control the dissolved oxygen in the reaction tank, thereby improving the denitrification efficiency by about 68%. Even the higher the C/N ratio at the step addition can be expected the higher the nitrogen removal, it is noteworthy that the optimum feeding ratio of the multi-step addition may be different depending on the C/N ratio.

scholarly journals Construction of autotrophic nitrogen removal system based on zero-valent iron (ZVI): performance and mechanism

2020 ◽  
Vol 82 (12) ◽  
pp. 2990-3002
Author(s):  
Han Yang ◽  
Liangwei Deng ◽  
Youqian Xiao ◽  
Hongnan Yang ◽  
Hong Wang ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Removal Rate ◽  
Inorganic Nitrogen ◽  
Zero Valent Iron ◽  
Batch Reactors ◽  
Ammonium Oxidation ◽  
N Accumulation ◽  
Ferric Ammonium ◽  
Tin Removal ◽  
Performance And Mechanism

Abstract In this study, the performance and mechanism of nitrogen removal in sequencing batch reactors (SBRs) with and without zero-valent iron (ZVI) was investigated. The results showed that ZVI had a capacity to promote -N conversion, -N accumulation and total inorganic nitrogen (TIN) removal, with the TIN removal rate being increased by 29.45%. The ZVI also had a significant impact on microbial community structure by means of high-throughput pyrosequencing, increasing the enrichment of Anammox (anaerobic ammonium oxidation) bacteria Candidatus Brocadia and Feammox (anaerobic ferric ammonium oxidation) bacteria Ignavibacterium. With ZVI addition, the main pathway of nitrogen removal was changed from nitrification-heterotrophic denitrification to Anammox and Feammox.

Effectiveness Research of UASB Treatment Piggery Wastewater

2011 ◽  
Vol 183-185 ◽  
pp. 188-192
Author(s):  
Li Long Yan ◽  
Ying Zhang ◽  
Chuan Ju Li ◽  
Xue Han
Keyword(s):  
Removal Rate ◽  
Oxygen Demand ◽  
Ammonium Nitrogen ◽  
Swine Wastewater ◽  
Anaerobic Sludge ◽  
High Concentration ◽  
Piggery Wastewater ◽  
Efficient Treatment ◽  
Pig Farm ◽  
Anoxic Environment

In order to efficient treatment swine wastewater of chemical oxygen demand(COD) of high concentration, ammonium nitrogen (NH4+-N) of high concentration and high suspended solids (SS) , Up-flow Anaerobic Sludge Bed (UASB) were fed with piggery wastewater and investigated removal effect of COD, SS, NH4+-N, TP. The results showed that, UASB can effectively remove COD and SS in the pig farm wastewater. The corresponding removal rate was respectively 82.36% and 70%. UASB was poor on removal effect of NH4+-N and total phosphate (TP), due to the lack of anaerobic, anoxic environment. UASB is able to treatment COD and SS of piggery wastewater, but TN and TP removal efficiency need to further study.

Study on the performance of anaerobic ammonium oxidation treatment using PVA gel as a carrier

2009 ◽  
Vol 59 (5) ◽  
pp. 1037-1041 ◽  
Author(s):  
Y. S. Ge ◽  
A. Yamaguchi ◽  
H. Sakuma
Keyword(s):  
Nitrogen Removal ◽  
Treatment Process ◽  
Removal Rate ◽  
Low Cost ◽  
Anaerobic Ammonium Oxidation ◽  
Anammox Bacteria ◽  
Ammonium Oxidation ◽  
High Concentration ◽  
Oxidation Treatment ◽  
Pva Gel

A continuous experiment was carried out to study the performance of anaerobic ammonium oxidation (anammox), a novel and low cost nitrogen removal treatment process with an energy-saving characteristic. A complete mixing reactor was used with polyvinyl alcohol (PVA) gel as the carrier. In particular, performances of nitrogen removal and attachment characteristics of anammox bacteria on the PVA carrier surface were investigated. The results indicted that high concentration of anammox bacteria, up to 27,000 mg/L-carrier, had attached on the PVA carrier surface. A high nitrogen removal rate of up to 5.5 kg/m3-reactor/d was obtained during this continuous experiment. Furthermore, it was also confirmed that there was no generation of N2O gas in the anammox reaction

Treatment of wastewater from oil manufacturing plant by yeasts

1996 ◽  
Vol 34 (11) ◽  
pp. 51-58 ◽  
Author(s):  
K. Chigusa ◽  
T. Hasegawa ◽  
N. Yamamoto ◽  
Y. Watanabe
Keyword(s):  
Pilot Plant ◽  
Removal Rate ◽  
Oil Removal ◽  
Oxidation Activity ◽  
Single Strain ◽  
Manufacturing Plants ◽  
Yeast Strains ◽  
Hexane Extracts ◽  
One Year ◽  
Raw Wastewater

Nine strains of yeasts capable of decomposing oil were isolated in order to directly treat wastewater from oil manufacturing plants with no pretreatment. The oil decomposing ability of these yeast strains was evaluated in terms of lipase activity and β-oxidation activity. Since the mixture of the isolated yeasts was superior to any single strain in the oil removal rate, a pilot plant utilizing the mixed strains was operated at the soybean oil factory. Following a one year pilot plant operation, it was found that 10,000 mgℓ−1 of hexane extracts in the raw wastewater could be reduced by yeast treatment to a concentration of about 100 mgℓ−1. This concentration was further treated by the activated sludge process to 2 mgℓ−1. The dominant yeasts in the pilot plant were found to form mycelial or pseudomycelial pellets and have low fermenting ability.

scholarly journals Ti/RuO2-IrO2-SnO2 Anode for Electrochemical Degradation of Pollutants in Pharmaceutical Wastewater: Optimization and Degradation Performances

2020 ◽  
Vol 13 (1) ◽  
pp. 126
Author(s):  
Guozhen Zhang ◽  
Xingxing Huang ◽  
Jinye Ma ◽  
Fuping Wu ◽  
Tianhong Zhou
Keyword(s):  
Removal Rate ◽  
Inorganic Compounds ◽  
Oxide Coating ◽  
X Ray Diffraction ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Dimensionally Stable Anodes ◽  
X Ray ◽  
Initial Ph ◽  
Cod Removal Rate

Electrochemical oxidation technology is an effective technique to treat high-concentration wastewater, which can directly oxidize refractory pollutants into simple inorganic compounds such as H2O and CO2. In this work, two-dimensionally stable anodes, Ti/RuO2-IrO2-SnO2, have been developed in order to degrade organic pollutants from pharmaceutical wastewater. Characterization by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) showed that the oxide coating was successfully fabricated on the Ti plate surface. Electrocatalytic oxidation conditions of high concentration pharmaceutical wastewater was discussed and optimized, and the best results showed that the COD removal rate was 95.92% with the energy consumption was 58.09 kW·h/kgCOD under the electrode distance of 3 cm, current density of 8 mA/cm2, initial pH of 2, and air flow of 18 L/min.

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