Influence of pyrolysis temperature on production of digested sludge biochar and its application for ammonium removal from municipal wastewater

2019 ◽  
Vol 209 ◽  
pp. 927-936 ◽  
Author(s):  
Yao Tang ◽  
Md Samrat Alam ◽  
Kurt O. Konhauser ◽  
Daniel S. Alessi ◽  
Shengnan Xu ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Pyrolysis Temperature ◽  
Digested Sludge ◽  
Ammonium Removal

scholarly journals Application of Natural Clinoptilolite for Ammonium Removal from Sludge Water

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 114
Author(s):  
Stephan Wasielewski ◽  
Eduard Rott ◽  
Ralf Minke ◽  
Heidrun Steinmetz
Keyword(s):  
Industrial Wastewater ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Substrate Inhibition ◽  
High Stress ◽  
Kinetic Studies ◽  
Digested Sludge ◽  
Ammonium Removal ◽  
Higher Temperature ◽  
Natural Clinoptilolite

Sludge water (SW) arising from the dewatering of anaerobic digested sludge causes high back loads of ammonium, leading to high stress (inhibition of the activity of microorganisms by an oversupply of nitrogen compounds (substrate inhibition)) for wastewater treatment plants (WWTP). On the other hand, ammonium is a valuable resource to substitute ammonia from the energy intensive Haber-Bosch process for fertilizer production. Within this work, it was investigated to what extent and under which conditions Carpathian clinoptilolite powder (CCP 20) can be used to remove ammonium from SW and to recover it. Two different SW, originating from municipal WWTPs were investigated (SW1: c0 = 967 mg/L NH4-N, municipal wastewater; SW2: c0 = 718–927 mg/L NH4-N, large industrial wastewater share). The highest loading was achieved at 307 K with 16.1 mg/g (SW1) and 15.3 mg/g (SW2) at 295 K. Kinetic studies with different specific dosages (0.05 gCLI/mgNH4-N), temperatures (283–307 K) and pre-loaded CCP 20 (0–11.4 mg/g) were conducted. At a higher temperature a higher load was achieved. Already after 30 min contact time, regardless of the sludge water, a high load up to 7.15 mg/g at 307 K was reached, achieving equilibrium after 120 min. Pre-loaded sorbent could be further loaded with ammonium when it was recontacted with the SW.

Anaerobic thermophilic digestion of sewage sludge with a thickened sludge recycle

2012 ◽  
Vol 65 (3) ◽  
pp. 403-409 ◽  
Author(s):  
A. Ya. Vanyushina ◽  
Yu. A. Nikolaev ◽  
A. M. Agarev ◽  
M. V. Kevbrina ◽  
M. N. Kozlov
Keyword(s):  
Retention Time ◽  
Municipal Wastewater ◽  
Hydraulic Retention Time ◽  
Biogas Production ◽  
Wastewater Sludge ◽  
Recycling Process ◽  
Digested Sludge ◽  
Volatile Solids ◽  
Solids Retention ◽  
Thermophilic Digestion

The process of anaerobic thermophilic digestion of municipal wastewater sludge with a recycled part of thickened digested sludge, was studied in semi-continuous laboratory digesters. This modified recycling process resulted in increased solids retention time (SRT) with the same hydraulic retention time (HRT) as compared with traditional digestion without recycling. Increased SRT without increasing of HRT resulted in the enhancement of volatile substance reduction by up to 68% in the reactor with the recycling process compared with 34% in a control conventional reactor. Biogas production was intensified from 0.3 L/g of influent volatile solids (VS) in the control reactor up to 0.35 L/g VS. In addition, the recycling process improved the dewatering properties of digested sludge.

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.

scholarly journals Biochemical Hydrogen Potential Tests Using Different Inocula

2019 ◽  
Vol 11 (3) ◽  
pp. 622 ◽  
Author(s):  
Isabella Pecorini ◽  
Francesco Baldi ◽  
Renato Iannelli
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Anaerobic Reactor ◽  
Municipal Wastewater Treatment Plant ◽  
Solids Removal

Four inocula collected from different operating facilities were tested in their hydrogenic performances by means of two biochemical hydrogen potential test set-ups using sucrose and food waste as substrates, with the aim of evaluating the influence of inoculum media in batch fermentative assays. The selected inocula were: activated sludge collected from the aerobic unit of a municipal wastewater treatment plant, digested sludge from an anaerobic reactor treating organic waste and cattle manure, digested sludge from an anaerobic reactor treating agroindustrial residues, and digested sludge from an anaerobic reactor of a municipal wastewater treatment plant. Test results, in terms of specific hydrogen production, hydrogen conversion efficiency, and volatile solids removal efficiency, were significantly dependent on the type of inoculum. Statistical analysis showed different results, indicating that findings were due to the different inocula used in the tests. In particular, assays performed with activated sludge showed the highest performances for both substrates and both experimental set-ups.

Evaluating the stabilisation degree of digested sewage sludge: investigations at four municipal wastewater treatment plants

2006 ◽  
Vol 53 (8) ◽  
pp. 81-90 ◽  
Author(s):  
V. Parravicini ◽  
E. Smidt ◽  
K. Svardal ◽  
H. Kroiss
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Aerobic Conditions ◽  
Specific Oxygen Uptake Rate ◽  
Municipal Wastewater Treatment Plants ◽  
Digested Sewage Sludge

Further reduction of volatile suspended solids (VSS) during a post-stabilisation step was applied to evaluate the stabilisation degree of digested sewage sludge. For this purpose digested sludge was collected at four municipal wastewater treatment plants (WWTPs) and further stabilised in lab-scale chemostat reactors either under anaerobic or aerobic conditions. Experimental results showed that even in adequately digested sludge a consistent amount of VSS was degraded during aerobic post-stabilisation. It seems that aerobic conditions play a significant role during degradation of residual VSS. Additionally, specific VSS production (gVSS/peCOD110.d) as well as specific oxygen uptake rate were shown to be suitable parameters to assess the degree of sludge stabilisation at WWTPs. Fourier transform infrared spectroscopy was used to reveal changes in the sludge composition. Spectra of treated and untreated sludge samples indicated that the major component of residual VSS in stabilised sludge for instance consisted of biomass, while cellulose was absent.

scholarly journals Effect of Intermittent Aeration in a Hybrid Vertical Anaerobic Biofilm Reactor (HyVAB) for Reject Water Treatment

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1151
Author(s):  
Vasan Sivalingam ◽  
Carlos Dinamarca ◽  
Eshetu Janka ◽  
Sergey Kukankov ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Water Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Biofilm Reactor ◽  
Anaerobic Sludge ◽  
Main Process ◽  
Intermittent Aeration ◽  
High Concentration ◽  
Ammonium Removal ◽  
Reject Water

Water from anaerobic sludge dewatering (reject water that is recycled to the inlet main process treatment) from the Knarrdalstrand municipal wastewater treatment plant in Porsgrunn, Norway, contains 2.4 g/L of total chemical oxygen demand (TCOD) and 550 mg/L NH4-N (annual average). The high concentration of ammonium causes disturbances in the mainstream physical and chemical processes, while only a small fraction of the organics is biodegradable. A pilot-scale hybrid vertical anaerobic biofilm (HyVAB) reactor combining anaerobic and aerobic treatment was tested for reject water treatment to reduce process disturbances. The pilot HyVAB was prepared for the study with continuous aeration of the aerobic part of the reactor for 200 days, while two intermittent aeration schemes were applied during the three-month test period. Ammonium removal efficiency increased from 8% during the continuous aeration period to 50% at the end of the test when a short (7 min) aeration cycle was applied. COD removal was close to 20%, which was mainly obtained in the anaerobic stage and not significantly influenced by the aerations schemes. Simultaneous partial nitrification and denitrification were established in the biofilm that alternated between aerobic and anoxic conditions. The observed high ammonium removal is explained by two alternative shortcut processes via nitrite. The lack of biodegradable organics in the aerated stage suggests that most of the nitrogen removal was via the anammox pathway (autotrophic denitrification). The HyVAB, combining an anaerobic sludge bed and an intermittently aerated biofilm, appears to be an efficient process to treat high ammonium containing reject water.

Applications and limitations of ADM 1 in municipal wastewater solids treatment

2006 ◽  
Vol 54 (4) ◽  
pp. 77-82 ◽  
Author(s):  
B.R. Johnson ◽  
Y. Shang
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Metal Phosphate ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Chemical Equilibria ◽  
Actual Operating ◽  
Wide Range ◽  
Treatment Facilities ◽  
Inorganic Reactions

The ADM 1 model has been implemented in a steady-state whole wastewater plant simulator. The ADM 1 model has been in use with good success for approximately 2 years on a wide range of wastewater treatment facilities. However, a number of modifications were necessary to allow it to be used in the context of municipal wastewater treatment. It was found that the model's use was greatly simplified if used in conjunction with a larger plant simulator to assist in the feed fractionation. It was also found that a better fit to actual operating data was achieved if some of the slowly biodegradable particulate fraction was partitioned into ADM particulate fractions other than the composite fraction. Another significant limitation of the model is in the absence of phosphorus modeling. The ADM model needs to have phosphorus handling for all the relevant fractions, and needs to include the handling of inorganic reactions such as struvite precipitation and metal phosphate/metal hydroxide precipitation. Activity effects on chemical equilibria are significant when considering phosphorus. Also of importance in wastewater treatment is the fate of sulfur compounds. This includes the generation of H2S in the digester gas and the fate of the sulfur species in the digested sludge (as a predictor of odour-generating potential).

Novel design and optimisation of a nitritation/anammox set-up for ammonium removal from filtrate of digested sludge

2017 ◽  
Vol 39 (5) ◽  
pp. 593-606 ◽  
Author(s):  
Yury Nikolaev ◽  
Anna Kallistova ◽  
Marina Kevbrina ◽  
Alexander Dorofeev ◽  
Anton Agarev ◽  
...  
Keyword(s):  
Digested Sludge ◽  
Ammonium Removal ◽  
Set Up ◽  
Novel Design

A Study of Controlled Recirculation of Anaerobic Activated Sludge Digestion Reactors

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2449-2452 ◽  
Author(s):  
C.-F. Ouyang ◽  
H.-Y. Lin
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Sludge ◽  
The Other ◽  
Performance Parameters ◽  
Digested Sludge ◽  
Sludge Digestion ◽  
Recycle Ratio ◽  
The Mathematical Model ◽  
Positive Effect

A bench scale anaerobic activated sludge digestion (AASD) process was developed to study the effect of biomass recycling at different amounts of digested sludge recirculation and various solids concentrations in feed sludge. It was selected to observe how the anaerobic digestion can be improved and stabilized by using municipal wastewater sludge. The mathematical model of AASD process was developed.The positive effect of biomass recycling on the sludge concentration depends on the settling rate of the sludge. The performance parameters such as SRT, methane yield and DHA of the reactor with R= 0.5 were found best among those of the other recycle ratio reactors. With the reactor with sludge loading of 1.1 kg TVS/m3 day, SRT/HRT = 1.493 can be obtained.

scholarly journals Integrated Membrane Process for the Treatment and Reuse of Residual Table Olive Fermentation Brine and Anaerobically Digested Sludge Centrate

Membranes ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 253
Author(s):  
Carlos Carbonell-Alcaina ◽  
Jose Luis Soler-Cabezas ◽  
Amparo Bes-Piá ◽  
María Cinta Vincent-Vela ◽  
Jose Antonio Mendoza-Roca ◽  
...  
Keyword(s):  
Organic Matter ◽  
Municipal Wastewater ◽  
Forward Osmosis ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Transmembrane Pressure ◽  
Municipal Wastewater Treatment ◽  
Digested Sludge ◽  
Anaerobically Digested Sludge ◽  
Table Olive

Management of wastewater is a major challenge nowadays, due to increasing water demand, growing population and more stringent regulations on water quality. Wastewaters from food conservation are especially difficult to treat, since they have high salinity and high organic matter concentration. The aim of this work is the treatment of the effluent from a table olive fermentation process (FTOP) with the aim of reusing it once the organic matter is separated. The process proposed in this work consists of the following membrane-based technologies: Ultrafiltration (UF) (UP005, Microdyn Nadir), Forward Osmosis (FO) (Osmen2521, Hydration Technology Innovation) and Nanofiltration (NF) (NF245, Dow). The FO process was implemented to reduce the salinity entering the NF process, using the FTOP as draw solution and, at the same time, to concentrate the centrate produced in the sludge treatment of a municipal wastewater treatment plant with the aim of obtaining a stream enriched in nutrients. The UF step achieved the elimination of 50% of the chemical oxygen demand of the FTOP. The UF permeate was pumped to the FO system reducing the volume of the anaerobically digested sludge centrate (ADSC) by a factor of 3 in 6.5 h. Finally, the ultrafiltrated FTOP diluted by FO was subjected to NF. The transmembrane pressure needed in the NF stage was 40% lower than that required if the ultrafiltration permeate was directly nanofiltered. By means of the integrated process, the concentration of organic matter and phenolic compounds in the FTOP decreased by 97%. Therefore, the proposed process was able to obtain a treated brine that could be reused in other processes and simultaneously to concentrate a stream, such as the ADSC.

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