scholarly journals Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater

2019 ◽  
Vol 6 (9) ◽  
pp. 190304 ◽  
Author(s):  
Liangang Hou ◽  
Jun Li ◽  
Zhaoming Zheng ◽  
Qi Sun ◽  
Yitao Liu ◽  
...  
Keyword(s):  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
River Sediment ◽  
Removal Rate ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
River Sediments ◽  
Sediment Addition ◽  
Application Potential ◽  
Novel Method

The river sediment contains a lot of pollutants in many cases, and needs to be treated appropriately for the restoration of water environments. In this study, a novel method was developed to convert river sediment into denitrifying sludge in a sequencing batch reactor (SBR). The river sediment was added into the reactor daily and the hydraulic retention time (HRT) of the reactor was gradually reduced from 8 to 4 h. The reactor achieved in the N O 3   – N removal efficiency of 85% with the N O 3   – N removal rate of 0.27 kg N m −3 d −1 . Response surface analysis represents that nitrate removal was affected mainly by HRT, followed by sediment addition. The denitrifying sludge achieved the highest activity with the following conditions: N O 3   – N 50 mg l −1 , HRT 6 h and adding 6 ml river sediments to 1 l wastewater of reactor per day. As a result, the cultivated denitrifying sludge could remove 80% N O 3   – N for real municipal wastewater, and the high-throughput sequence analysis indicated that major denitrifying bacteria genera and the relative abundance in the cultivated denitrifying sludge were Diaphorobacter (33.82%) and Paracoccus (24.49%). The river sediments cultivating method in this report can not only obtain denitrifying sludge, but also make use of sediment resources, which has great application potential.

Research on the Fast Start-up of Anaerobic-Aerobic-Anoxic-Aerobic Sequencing Batch Reactor

2011 ◽  
Vol 374-377 ◽  
pp. 1013-1016
Author(s):  
Hui Yang ◽  
Yu Zhang ◽  
Yue Xu
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Start Up ◽  
Fast Start

Abstract. The paper aims to study the fast start-up of anaerobic-aerobic-anoxic-aerobic sequencing batch reactor, with domestic sewage as treating object, to solve the problem of SBR that can be used for denitrification or dephosphorization independently and to realize simultaneous nitrogen and phosphorus removal in a single SBR system. Phosphorus accumulating organisms were enriched at the anaerobic condition for 2h/aerobic for 3h after activated sludge were inoculated. Then denitrifying polyphosphate-accumulating organisms were enriched by inserting an anoxic phase into the aerobic phase. The lengths of anaerobic time, anoxic time and aerobic time were adjusted and the nitrogen and phosphorus removal effect of (AO)2SBR system were observed. The (AO)2SBR system was started successfully with 80d of training and domesticating. The nitrogen and phosphorus removal effect was performed preferably at the condition of anaerobic(2h)-aerobic(1.5h)-anoxic(1.5h)-aerobic(0.5h). The removal rate of COD, NH4+-N, TN and TP reached 90%, 97%, 88% and 92% respectively. And 33% of energy was saved when aerobic time was shortened from 3h to 2h, while the treating effect dropped off rarely. The results show that (AO)2SBR is applicable for simultaneous nitrogen and phosphorus removal, and the effluent water quality meets the first level B criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The system can also reach the aim of saving energy and providing theoretical basis for the nitrogen and phosphorus removal in single SBR systems.

The Realization of Nitrification and Denitrification Processes in Low C/N Sewage

2011 ◽  
Vol 233-235 ◽  
pp. 600-603
Author(s):  
Gao Shun Qiu ◽  
Ling Feng Qiu ◽  
Yi Ming Chen
Keyword(s):  
Inflection Point ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Ammonia Oxidation ◽  
Ph Value ◽  
Removal Rate ◽  
Batch Reactor ◽  
Mixing Time ◽  
Simultaneous Nitrification And Denitrification ◽  
Nitrification And Denitrification

The influences of HRT, C/N ratio on simultaneous nitrification and denitrification (SND) and the rule of pH in a sequencing batch reactor (SBR) were investigated while treating low C/N synthetic municipal wastewater. The results showed that the function of SND became more outstanding and the removal rate of TN, NH4+-N was improved greatly by lengthening HRT appropriately; when the C/N increased, the denitrification effect of the simultaneous nitrification and denitrification would be improved; .At the same time, the variation of pH value was well related to ammonia oxidation. So that judgment on the ending of nitrification and denitrification could be based on the inflection point on the varied curve of pH, and thus reducing aeration and mixing time for the purpose of energy saving.

scholarly journals Real-Time Behavior of a Microalgae–Bacteria Consortium Treating Wastewater in a Sequencing Batch Reactor in Response to Feeding Time and Agitation Mode

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1893
Author(s):  
Emna Mhedhbi ◽  
Nadia Khelifi ◽  
Paola Foladori ◽  
Issam Smaali
Keyword(s):  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Continuous Illumination ◽  
Feeding Time ◽  
Time Behavior ◽  
Mechanical Mixing ◽  
Nannochloropsis Gaditana

A study of a microalgae–bacteria treatment system was conducted in a sequencing batch reactor (SBR) by combining a precultured native algae Nannochloropsis gaditana L2 with spontaneous municipal wastewater microorganisms. Two types of agitation, air mixing (AI) and mechanical mixing (MIX), were assessed at continuous illumination (L) and photoperiod cycle light/dark (L/D). The obtained consortium, via native microalgae addition, has a better operational efficiency compared to spontaneous control. This allows the removal of 78% and 53% of total Kjeldhal nitrogen (TKN) and chemical oxygen demand (COD), respectively. Under the (L/D) photoperiod, the optimal removal rate (90% of TKN and 75% of COD) was obtained by the consortium at 4 days of hydraulic retention time (HRT) using the AI mode. Moreover, during feeding during dark (D/L) photoperiod, the highest removal rate (83% TKN and 82% COD) was recorded at 4 days HRT using the AI mode. These results bring, at the scale of a bioreactor, new data regarding the mode of aeration and the feeding time. They prove the concept of such a technology, increasing the attraction of microalgae-based wastewater treatment.

Dynamics of phosphorus and organic substrates in anaerobic and aerobic phases of a sequencing batch reactor

1994 ◽  
Vol 30 (6) ◽  
pp. 237-246 ◽  
Author(s):  
A. Carucci ◽  
M. Majone ◽  
R. Ramadori ◽  
S. Rossetti
Keyword(s):  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
General Assumption ◽  
Organic Substrate ◽  
Operating Conditions ◽  
Phosphate Removal ◽  
Substrate Uptake ◽  
Organic Substrates ◽  
Polyphosphate Metabolism

This paper describes a lab-scale experimentation carried out to study enhanced biological phosphate removal (EBPR) in a sequencing batch reactor (SBR). The synthetic feed used was based on peptone and glucose as organic substrate to simulate the readily biodegradable fraction of a municipal wastewater (Wentzel et al., 1991). The experimental work was divided into two runs, each characterized by different operating conditions. The phosphorus removal efficiency was considerably higher in the absence of competition for organic substrate between P-accumulating and denitrifying bacteria. The activated sludge consisted mainly of peculiar microorganisms recently described by Cech and Hartman (1990) and called “G bacteria”. The results obtained seem to be inconsistent with the general assumption that the G bacteria are characterized by anaerobic substrate uptake not connected with any polyphosphate metabolism. Supplementary anaerobic batch tests utilizing glucose, peptone and acetate as organic substrates show that the role of acetate in the biochemical mechanisms promoting EBPR may not be so essential as it has been assumed till now.

scholarly journals Methods of reconstruction and modification of the sequencing batch reactor at municipal wastewater treatment plants in Vietnam

Vestnik MGSU ◽  
2019 ◽  
pp. 589-602 ◽  
Author(s):  
Tran Ha Quan ◽  
Elena S. Gogina
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Municipal Wastewater Treatment ◽  
Wastewater Purification ◽  
Municipal Wastewater Treatment Plants ◽  
Operation Cycle

Introduction. Vietnamese urban municipal wastewater treatment plants are mainly of aeration-type facilities. Nowadays, an aeration-type plant, the Sequencing Batch Reactor (SBR), is widely applied and possesses a number of advantages over traditional systems with suspended activated sludge. Advantages of the SBR are mainly concluded in simplicity of operation, occupied area and cost. There is a number of problems at the wastewater treatment plants; they are connected with supplying only a half of wastewater design amount for the treatment as well as with quality of the purified water that must satisfy requirements of the Vietnamese discharge standard, the Standard A. Therefore, reconstruction and modification of the SBR is the major challenger to ensure the sustained development of large Vietnamese cities and maintenance of ecological balance. Materials and methods. To enhance the efficiency of wastewater purification in the SBR, the experiments were set on reactor reconstruction and modification by two directions: (1) Technological method, i.e. applying the Biochip 25 biocarrier, and (2) Operation method, i.e. adding the anoxic phase in reactor operation cycle. Laboratory tests were conducted for each of the directions, including comparison of a typical reactor with the modified one. Results. The study resulted in obtaining an optimal amount of the BioChip biocarrier material (10 to 20 %) that increased efficiency of wastewater purification by 10 to 20 %. In addition to this, when creating an anoxic phase of the operation cycle, efficiency of nitrogen removal increased by 20 %. When the denitrification occurs under the anoxic conditions, it contributes to stabilization of ammonium nitrogen removal for daily nitrogen loading in reactor of 0.3 to 0.8 TKN kg/sludge kg. Conclusions. The suggested technology provides the quality of treated water corresponding with the Vietnamese Standard A requirements. At the present, it is planned to proceed with the experiment on the base of Vietnamese semi-industrial plant for research and appraisal of the SBR reconstruction and modification method. Acknowledgements. The authors are grateful to AKVA Control company in Samara for granted biocarrier Mutag BioChip 25 and to Associate Professor Tran Van Quang and his students, Nguyen Ngoc Phuong and Truong Quoc Dai, of Environment Protect Research Center, Danang University for support of the experiment.

scholarly journals Study of COD Removal Rate on a Sequencing Batch Reactor (SBR) Treating Tapioca Wastewater

2019 ◽  
Vol 38 (3) ◽  
pp. 243
Author(s):  
Happy Mulyani ◽  
Gregorius Prima Indra Budianto ◽  
Margono Margono ◽  
Mujtahid Kaavessina
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
Cod Removal ◽  
Operation Condition ◽  
Effluent Quality ◽  
Aeration Time ◽  
Standard Quality ◽  
Cod Removal Rate

Industrial wastewater treatment using Sequencing Batch Reactor (SBR) can improve effluent quality at lower cost than that obtained by other biological treatment methods. Further optimization is still required to enhance effluent quality until it meets standard quality and to reduce the operating cost of treatment of high strength organic wastewater. The purpose of this research was to determine the effect of pretreatment (pH adjustment and prechlorination) and aeration time on effluent quality and COD removal rate in tapioca wastewater treatment using SBR. Pretreatment was done by (1) adjustment of tapioca wastewater pH to control (4.92), 7, and 8, and (2) tapioca wastewater prechlorination at pH 8 during hour using calcium hypochlorite in variation dosages 0, 2, 4, 6 mg/L Cl2, SBR operation was conducted according to following steps: (1) Filling of pre-treated wastewater into a bioreactor during 1 hour, and (2) aeration of the mixture of tapioca wastewater and activated sludge during 8 hours. Effluent sample was collected at every 2-hours aeration for COD analysis. COD removal rate mathematical formula was got by first deriving the best fit function between aeration time and COD. Optimum aeration time resulting in no COD removal rate. The value of COD effluent and its removal rate in optimum aeration time was used to determine the recommended of operation condition of pretreatment. Research result shows that chosen pH operation condition is pH 8. Prechorination can make effluent quality which meets standard quality and highest COD removal rate. The chosen Cl2 dosage is 6 mg/L.

scholarly journals Municipal wastewater treatment by the bioaugmentation of Bacillus sp. K5 within a sequencing batch reactor

PLoS ONE ◽  
2017 ◽  
Vol 12 (6) ◽  
pp. e0178837 ◽  
Author(s):  
Yunlong Yang ◽  
Linxiang Xie ◽  
Xin Tao ◽  
Kaihui Hu ◽  
Shaobin Huang
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Bacillus Sp ◽  
Municipal Wastewater Treatment

Advanced nitrogen removal via nitrite from municipal wastewater in a pilot-plant sequencing batch reactor

2009 ◽  
Vol 59 (12) ◽  
pp. 2371-2377 ◽  
Author(s):  
Q. Yang ◽  
X. H. Liu ◽  
Y. Z. Peng ◽  
S. Y. Wang ◽  
H. W. Sun ◽  
...  
Keyword(s):  
Carbon Source ◽  
Process Control ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Pilot Plant ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Nitrite Accumulation ◽  
Advanced Nitrogen Removal

To obtain economically sustainable wastewater treatment, advanced nitrogen removal from municipal wastewater and the feasibility of achieving and stabilizing short-cut nitrification and denitrification were investigated in a pilot-plant sequencing batch reactor (SBR) with a working volume of 54 m3. Advanced nitrogen removal, from summer to winter, with effluent TN lower than 3 mg/L and nitrogen removal efficiency above 98% was successfully achieved in pulsed-feed SBR. Through long-term application of process control in pulsed-feed SBR, nitrite accumulation reached above 95% at normal temperature of 25°C. Even in winter, at the lowest temperature of 13°C, nitrite was still the end production of nitrification and nitrite accumulation was higher than 90%. On the basis of achieving advanced nitrogen removal, short-cut nitrification and denitrification was also successfully achieved. Compare to the pulse-feed SBR with fixed time control, the dosage of carbon source and energy consumption in pulsed-feed SBR with process control were saved about 30% and 15% respectively. In pulsed-feed SBR with process control, nitrogen removal efficiency was greatly improved. Moreover, consumption of power and carbon source was further saved.

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