Effect of MLSS on Nitrosation Denitrifying Phosphorus Removal System

2013 ◽  
Vol 777 ◽  
pp. 303-308 ◽  
Author(s):  
Li Cheng Zhang ◽  
Qiang Liu ◽  
Yu Lan ◽  
Yang Yu
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Phosphorus Release ◽  
Low Carbon ◽  
High Concentration ◽  
Nitrogen And Phosphorus ◽  
Denitrifying Phosphorus Removal ◽  
Phosphorus Absorption ◽  
Cod Removal Rate

The influence of MLSS on nitrosation denitrifying phosphorus removal (NDPR) process was investigated through the experiments of anaerobic-anoxic NDPR and anoxic NDPR. Experimental results show that the higher MLSS is, the bigger COD removal rate is, and the higher the rates of anaerobic phosphorus release and anoxic phosphorus absorption are. Low carbon sewage will easily lead to insufficient inner carbon source in the system with high MLSS. High concentration of carbon source in the raw water with high MLSS will bring considerable difficulties to returned sludge and sludge treatment. Moreover, excessive MLSS will result in phosphorus release in the later anoxic stage, and lower MLSS can prolong the time of denitrification and phosphorus removal. The system with 5200 mg/L MLSS has the best effect of nitrogen and phosphorus removal.

Improvment of nitrogen and phosphorus removal in the anaerobic-oxic-anoxic-OXIC (AOAO) process by stepwise feeding

2000 ◽  
Vol 42 (3-4) ◽  
pp. 89-94 ◽  
Author(s):  
H.Y. Chang ◽  
C.F. Ouyang
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Feeding Strategy ◽  
Synthetic Wastewater ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Kjeldahl Nitrogen ◽  
P Removal

This investigation incorporated a stepwise feeding strategy into the biological process containing anaerobic/oxide/anoxic/oxide (AOAO) stages to enhance nitrogen and phosphorus removal efficiencies. Synthetic wastewater was fed into the experimental reactors during the anaerobic and anoxic stages and the substrates/nutrients were successfully consumed without recycling either nitrified effluent or external carbon source. An intrinsic sufficient carbon source developed during the anoxic stage and caused the NOx (NO2-N+NO3-N) concentration to be reduced from 11.85mg/l to 5.65mg/l. The total Kjeldahl nitrogen (TKN) removal rate was between 81.81%∼93.96% and the PO4-P removal ratio ranged from 93%∼100%. The substrate fed into the anaerobic with a Q1 flow rate and a Q2 into the anoxic reactor. The three difference experiments contained within this study produced Q1/Q2 that varied from 7/3, 8/2, and 9/1. The AOAO process saved nearly one-third of the energy compared with typical biological nutrient removal (BNR) system A2O processes.

Changes of pH in A2O Process System and its Impact on Nitrogen and Phosphorus Removal

2012 ◽  
Vol 588-589 ◽  
pp. 55-58
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
Ph Value ◽  
Removal Rate ◽  
Phosphorus Release ◽  
Ammonia Nitrogen ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Process System ◽  
High Level

Simulate sewage were used in an anaerobic-anoxic-aerobic biological nutrient removal system(A2O process), by observing the pHs in different compartments and its reflected changes in nitrogen and phosphorus removal, studied on the effects of different pHs on the removal of pollutants. The experiments indicates that the anaerobic phosphorus release showed the main performance of the decline of pH, denitrification in anoxic zone caused the rise of pH, uptake of phosphate in the aerobic zone mainly caused the continuous rise of pH. There is no evidently changes in COD removal, ammonia nitrogen get the highest removal as the pH value was between 8.0-8.5, when pH was at 6.5-7.5, the TN have the maximum removal rate, TP can keep in a high level when the pH was above 6.0.

scholarly journals Pilot study on the treatment of low carbon and nitrogen ratio municipal sewage by AOAAO sludge-membrane coupling process with multi-point inflow

2021 ◽  
Author(s):  
Dewei Zhang ◽  
Jun-Tian Zheng ◽  
Jun Zheng ◽  
Meng-Ke Zhao ◽  
Meng-Lin Wang ◽  
...  
Keyword(s):  
Distribution Ratio ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Domestic Sewage ◽  
Low Carbon ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Coupling Process ◽  
Carbon And Nitrogen ◽  
Nitrogen Ratio

Abstract A new multi-point inflowA1/O2/A3/A4/O5 sludge-membrane coupling process and pilot plant were developed and designed to solve the problem of nitrogen and phosphorus removal of low C/N domestic sewage in southern China. By changing the distribution ratio of multi-point influent, the removal effect and transformation rule of organic matter, nitrogen and phosphorus in the system were studied. Results showed that when the average low C/N ratio of influent was 2.09 and the influent distribution ratio was 1:1, the average concentrations of COD, NH4+- N, TN and TP in the effluent were 21.31 mg/L, 0.60 mg/L, 12.76 mg/L and 0.34 mg/L, respectively, and the average removal rates are 87.3%, 98.7%, 74.1% and 88.1% respectively. When the low temperature was 12–15℃, the average removal rates were 87.3%, 98.7%, 74.1% and 88.1%, respectively. Compared with the traditional A2O process under the same conditions, the TN removal rate was increased by 15.4%, and the TP removal rate was increased by 22.2%. This system has obvious advantages in treating wastewater with low carbon and nitrogen ratio, which solved the problem that the effluent of biological phosphorus removal from low C/N ratio domestic sewage was difficult to be lower than 0.5 mg/L.

Effect of Internal Recycle Ratio on the Phosphorus Removal Efficiency of Anaerobic/Anoxic/Oxic (A2/O) to Low Concentration of Organic Substance Wastewater

2011 ◽  
Vol 393-395 ◽  
pp. 688-691
Author(s):  
Ning Wang ◽  
Ying He Jiang ◽  
Bo Fu Li
Keyword(s):  
Carbon Source ◽  
Organic Substance ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Biological Phosphorus Removal ◽  
High Concentration ◽  
Denitrifying Phosphorus Removal ◽  
Low Level ◽  
Recycle Ratio ◽  
Biological Phosphorus

In the pilot-scale plant, the effect of internal recycle ratios (300%, 200%, 100%, and 0%) on the biological phosphorus removal was represented. The denitrifying phosphorus removal in anoxic tank was improved with low internal recycle, under the inhibition of high concentration of NOx-N. To low level strength wastewater (average COD 185.6 mg/L, average BOD 115.2 mg/L), the low level carbon source maintained the relatively steady phosphorus removal rates.

The Recovery and Synthesis of Polyhydroxyalkanoates in the Process of Nitrogen and Phosphorus Removal in Low-Carbon Sewage Based on pH and Nitrogen and Phosphorus Restriction Under Anaerobic-Oxygen Limited Process

2021 ◽  
Author(s):  
Kequan Zhang ◽  
Qian Fang ◽  
Yihan Xie ◽  
Yujia Chen ◽  
Tong Wei ◽  
...  
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Source Control ◽  
Low Carbon ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Urban Sewage ◽  
Dry Cell Weight ◽  
Limited Process

Abstract Polyhydroxyalkanoate (PHA) is a new type of bio-polyester which is expected to replace traditional petroleum-based plastics. It is also a critical transformation hub of carbon source in nitrogen and phosphorus removal in sewage. Based on the anaerobic-oxygen limited process, the experiment took organic solid waste fermentation liquid as carbon source control hub and realized PHA synthesis and recovery in denitrification and phosphorus removal from low carbon sewage the SBR reactor by regulating pH value and nitrogen and phosphorus restriction. The experimental results showed that when the ratio of C/N and C/P was 150, the content of PHA accounted for 50.39% and 36.07 of the dry cell weight, respectively. Besides, it was found that increasing the C/N ratio was beneficial to increasing the proportion of PHV in PHA. This study proved the feasibility of using an anaerobic-oxygen limited process to recover PHA in nitrogen and phosphorus removal from low-carbon sewage, which saves gas and reduces energy consumption. At the same time, it also provides some help for the follow-up study of low-carbon urban sewage nitrogen and phosphorus removal coupled with resource recovery of PHA to guide the water industry economy to develop in a circular and sustainable direction

Influence of ORP variation, carbon source and nitrate concentration on denitrifying phosphorus removal by DPB sludge from dephanox process

2004 ◽  
Vol 50 (10) ◽  
pp. 153-161 ◽  
Author(s):  
Y.Y. Wang ◽  
Y.Z. Peng ◽  
C.Y. Peng ◽  
S.Y. Wang ◽  
W. Zeng
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Turning Point ◽  
Nitrate Concentration ◽  
Phosphorus Uptake ◽  
Phosphorus Release ◽  
Denitrifying Phosphorus Removal ◽  
External Carbon Source ◽  
High Nitrate Concentration ◽  
On Line

The effect of added carbon source and nitrate concentration on the denitrifying phosphorus removal by denitrifying phosphorus removal bacteria sludge was systematically studied using batch experiments, at the same time the variation of ORP was investigated. Results showed that the denitrifying and phosphorus uptake rate in the anoxic phase increased with the high initial anaerobic carbon source addition. However, once the initial COD concentration reached a certain level, which was in excess of the PHB saturation of Poly-p bacteria, residual COD carried over to the anoxic phase inhibited the subsequent denitrifying phosphorus uptake. This was equal to supplementing the external carbon source to the anoxic phase, furthermore the higher the external carbon source concentration the more powerful the inhibition caused. High nitrate concentration in the anoxic phase increased the initial denitrifying phosphorus rate. Once the nitrate was exhausted, phosphate uptake changed to phosphate release. Moreover, the time of this turning point occurred later with the higher nitrate addition. On the other hand, through on-line monitoring the variation of the ORP with different initial COD concentration, it was found that ORP could be used as a control parameter for phosphorus release, but it is impossible to utilize ORP for controlling the dinitrification and anoxic phosphorus uptake operations.

Nitrogen and Phosphorus Removal of Modified A2/O Process on Low-Carbon Domestic Sewage under Low Temperature

2013 ◽  
Vol 777 ◽  
pp. 187-191 ◽  
Author(s):  
Si Min Li ◽  
Guo Shuai Du ◽  
Feng Bing Tang
Keyword(s):  
Low Temperature ◽  
Phosphorus Removal ◽  
Carbon Sources ◽  
Phosphorus Release ◽  
Raw Water ◽  
Low Carbon ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Effluent Quality

A modified compound multiple-influent A2/O process was used to treat sewage with a low C/N under low temperature, the nitrogen and phosphorus removal was investigated. Raw water was distributed into anaerobic tank and anoxic tank by the proportion of 5:5 to rationally distribute the carbon sources required by anaerobic phosphorus release and anoxic denitrification. And some carriers were added into aerobic tank and anoxic tank separately to stabilize the effect of nitrification and denitrification and improve the denitrification efficiency. The effluent of anaerobic tank and anoxic tank flowed into aerobic tank to reduce the sludge flow path. In order to increase microbial biomass, adjust sludge return ratio was ranged from 50% to 75%. The results showed that when the water temperature is14°C, the concentration of COD, NH3-N, TN and TP in influent were 69.5 mg/L, 33.74 mg/L, 42.31 mg/L and 4.94 mg/L, the effluent quality of the above indexes were 40.1 mg/L, 1.45 mg/L, 12.54 mg/L and 0.46 mg/L, and the average removal of COD, NH3-N, TN, TP were 85.10%, 95.7%, 70.37% and 90.73%, respectively.

Impact of Different Carbon Sources on Phosphorus Removal in (AO)2SBR System

2014 ◽  
Vol 955-959 ◽  
pp. 231-234
Author(s):  
Hui Yang ◽  
Ji Gang Yang ◽  
Meng Zhao
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Sodium Acetate ◽  
Removal Rate ◽  
Carbon Sources ◽  
Phosphorus Release ◽  
Anoxic Condition ◽  
Biological Phosphorus Removal ◽  
Sodium Propionate ◽  
The Impact

This paper aims to study the impact of different carbon sources on phosphorus removal after the (AO)2SBR system was started successfully. Four kinds of carbon resources were used in sequence experiments to observe the impact of different carbon resources on phosphorus release at anaerobic condition, uptake aerobic condition, uptake anoxic condition and phosphorus removal of the (AO)2SBR system. And the carbon sources are sodium acetate, sodium propionate, glucose, sodium acetate + sodium propionate separately. The experiment result shows that the phosphorus release and uptake of active sludge at anaerobic/aerobic/anoxic condition was preferable with sodium acetate as carbon source. And the phosphorus removal rate of (AO)2SBR system and TP concentration in the effluent were 95% and under 0.5mg·L-1 respectively. The phosphorus removal rate of (AO)2SBR system was only 60% with glucose as carbon resource. This study concluded that it is beneficial for the biological phosphorus removal to choose organics with short carbon chain, such as sodium acetate as carbon source.

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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