Accelerated anaerobic release of K, Mg and P from surplus activated sludge for element recovery and struvite formation inhibition

2017 ◽  
Vol 75 (9) ◽  
pp. 2149-2156 ◽  
Author(s):  
A. Ito ◽  
H. Kawakami ◽  
N. Ishikawa ◽  
M. Ito ◽  
T. Oikawa ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Carbon Source ◽  
Organic Carbon ◽  
Activated Sludge ◽  
Anaerobic Condition ◽  
Sodium Acetate ◽  
Digestion Process ◽  
Additional Process ◽  
Organic Carbon Source ◽  
New System

Accelerated release of potassium (K), magnesium (Mg) and phosphorus (P) from surplus activated sludge (SAS) was investigated to develop a new system for the recovery of the elements. Anaerobic cultivation of SAS during 24 h released 78% of K and about 50% of Mg and P from SAS more effectively compared to aerobic cultivation (K: 40%, Mg: 15%, P: 15%). Furthermore, the addition of sodium acetate as an organic carbon source remarkably accelerated the release of K, Mg and P from SAS under anaerobic condition. However, no increase in the maximum release efficiencies was observed. The elements released from SAS could be transferred to separate liquid with the existing mechanical thickener and be recovered as MgKPO4 by some additional process. Furthermore, the removal of the elements from SAS would inhibit the formation of struvite causing the blockage of sludge transport pipe after anaerobic digestion process of thickened sludge.

Study on Biological Nitrogen Removal Performance of Aerobic Denitrification Treating Power Plant Wastewater

2013 ◽  
Vol 726-731 ◽  
pp. 2589-2593
Author(s):  
Tao Yang ◽  
Pei Ying Wu ◽  
Zhan Sheng Zhao ◽  
Hua Wei Xu ◽  
Gao Zhi Lv
Keyword(s):  
Power Plant ◽  
Carbon Source ◽  
Organic Carbon ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Sodium Acetate ◽  
Aerobic Denitrification ◽  
Biological Nitrogen Removal ◽  
Organic Carbon Source ◽  
Biological Nitrogen

Enriched domestication in SBR was used to improve the proportion of aerobic denitrifiers in activated sludge, and actual power plant wastewater was treated, which proved the existence of aerobic denitrification. But at the later stage, because of carbon deficiency, aerobic denitrifiers were inhibited and NO3--N accumulated. Sodium acetate used as external organic carbon source was added when reaction carried on 3.5 hours to improve the COD/NH4+-N ratio from 6.5 to 10, effluent NO3--N concentration was 3.6 mg\L, average removal efficiency of TN was 90%, which could improve the aerobic denitrification performance of whole system effectively.

Organic carbon effect on nitrifying bacteria in a mixed culture

2010 ◽  
Vol 61 (11) ◽  
pp. 2951-2956 ◽  
Author(s):  
L. Racz ◽  
T. Datta ◽  
R. K. Goel
Keyword(s):  
Carbon Source ◽  
Organic Carbon ◽  
Sodium Acetate ◽  
Carbon Sources ◽  
Cod Removal ◽  
Nitrifying Bacteria ◽  
Batch Reactors ◽  
Ammonia Oxidizing Bacteria ◽  
Sequencing Batch Reactors ◽  
Organic Carbon Source

This study investigated the effect of organic carbon source on ammonia oxidizing community in single sludge laboratory scale sequencing batch reactors (SBR). Two sequencing batch reactors performing simultaneous carbon oxidation and nitrification were operated. Operationally and functionally, these two reactors were identical, except that one reactor was fed peptone and sodium acetate, and the other was fed glucose and sodium acetate as external organic carbon sources. The peptone-fed reactor had 98.1±1.84% COD removal and 97.3±6.69% NH3-N oxidation. The glucose-fed reactor had 99.1±1.29% COD removal and 99.4±0.76% NH3-N oxidation. The reactor fed with peptone, a complex organic carbon source comprised of enzymatic digests of animal proteins, had greater diversity in both the heterotrophic bacterial community and the ammonia oxidizing bacteria community than in the reactor fed with glucose, a simple sugar as evidenced by automated ribosomal intergenic spacer analysis (ARISA) and terminal restriction fragment length polymorphism (TRFLP) experiments respectively.

Effect of different frequencies of the addition of Brachionus plicatilis on the performance of Litopenaeus vannamei in a nursery biofloc system with rice bran (anaerobic and aerobic) as an organic carbon source

Aquaculture ◽  
2021 ◽  
pp. 736669
Author(s):  
Rildo José Vasconcelos de Andrade Brazil ◽  
Elizabeth Pereira dos Santos ◽  
Gisely Karla de Almeida Costa ◽  
Clarissa Vilela Figueiredo Campos ◽  
Suzianny Maria Bezerra Cabral da Silva ◽  
...  
Keyword(s):  
Carbon Source ◽  
Organic Carbon ◽  
Rice Bran ◽  
Litopenaeus Vannamei ◽  
Brachionus Plicatilis ◽  
Organic Carbon Source

Mesophilic and Thermophilic Digestion of Thickened Waste Activated Sludge: A Comparative Study

2010 ◽  
Vol 113-116 ◽  
pp. 450-458 ◽  
Author(s):  
Yong Zhi Chi ◽  
Yu You Li ◽  
Min Ji ◽  
Hong Qiang ◽  
Heng Wei Deng ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Methane Content ◽  
Waste Activated Sludge ◽  
Digested Sludge ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
Significant Difference

This paper presents an experimental study over 204 days on anaerobic degradation of thickened waste activated sludge (TWAS) from a municipal wastewater treatment plant (WWTP). The experiments were conducted under thermophilic (55°C) and mesophilic (35°C) condition, respectively, by using the semi-continuous flow completely mixed reactors. The influent total solids (TS), hydraulic retention time (HRT) and chemical oxygen demand (COD) loading levels were around 4%, 30 days and 1.67 kg-CODCr•m-3•d-1 , respectively. During the opration period, the thermophilic anaerobic digestion process (TADP) and the mesophilic anaerobic digestion process (MADP) were stable and well-functioned without ammonia inhibition. Particulate organic matters reduction of TADP was superior to that of MADP. This result implies that TADP has higher sludge reduction efficiency than MADP. According to the simulated chemical formula of TWAS, C5.85H9.75O3.96N, and the stoichiometric equation, the methane content and the ammonia yield in the anaerobic process could be calculated, which were consistent with the experimental results. The methane yield of TADP was a little higher than that of MADP. The statistical mean values of methane content for TADP and MADP were 60.97% and 62.38%, respectively.According to paired t-test, there was a significant difference in methane content between TADP and MADP(α=0.01, n=62). Compared with the mesophilic digested sludge, the dewaterability of thermophilic digested sludge was lower.

The Research of Reduction Characteristics of Fe(III) Dissimilated by Different Activated Sludge

2013 ◽  
Vol 663 ◽  
pp. 1011-1016
Author(s):  
Jie Li ◽  
Si Yuan Zhai ◽  
Ya E Wang ◽  
Juan Juan Feng ◽  
Li Zhao
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Nutrient Solution ◽  
Anaerobic Condition ◽  
Reduction Rate ◽  
Anoxic Condition ◽  
Maximum Accumulation ◽  
Conventional Activated Sludge ◽  
Reduction Characteristics ◽  
Better Than

The effect of reduction characteristics of microbe dissimilating of Fe(III) under different activated sludge, carbon source and anoxic/anaerobic condition was studied by activated sludge as inoculum under laboratory condition. The results showed that the maximum accumulation of Fe(Ⅱ) and the reduction rate of Fe(III) inoculated by biological iron mud were higher than that inoculated by conventional activated sludge. The reduction characteristics of Fe(III) was better in nutrient solution as carbon source than that in sewage as carbon source when inoculated biological iron mud. But the reduction characteristics of Fe(III) was better in sewage as carbon source than that in nutrient solution as carbon source when inoculated conventional activated sludge. From the whole test, the reduction characteristics of dissimilating Fe(III) microbe under anaerobic condition were better than that under anoxic condition.

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