Effect of Pypocholoride Pretreatment on the Disintegration of Excess Sludge

2013 ◽  
Vol 864-867 ◽  
pp. 1333-1336 ◽  
Author(s):  
Ling Ling Wang ◽  
De Dong Sun ◽  
Jing Jing Ren ◽  
Chun Ma ◽  
Jun Hao ◽  
...  
Keyword(s):  
Reaction Time ◽  
Sewage Sludge ◽  
Chemical Oxygen Demand ◽  
Sodium Hypochlorite ◽  
Cell Walls ◽  
Oxygen Demand ◽  
Excess Sludge ◽  
Organic Matters ◽  
Sludge Flocs ◽  
Soluble Chemical Oxygen Demand

This article focuses on the effects of pretreatment on sewage sludge with sodium hypochlorite addition. The solubilization of organic matters of sludge was investigated. It was found that the pypocholoride treatment provided a efficient process to release organics from sludge flocs. When the ClO-dose was about 21mg /g SS with a reaction time of 3 hours, the supernatant soluble chemical oxygen demand (SCOD), total nitrogen (TN), total phosphorus (TP), protein and polysaccharide increased by 400%, 67%, 1791%, 635%, 214%, and 556%, respectively. After hypochlorite pretreatment, the sludge extracelluar polymers (EPS) were disintegrated and the cell walls were broken. Then the intracellular organic matters were released into the supernatant, leading to the increase of organic matters in the supernatant.

scholarly journals Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion

2005 ◽  
Vol 12 (1-2) ◽  
pp. 115-120 ◽  
Author(s):  
Antti Grönroos ◽  
Hanna Kyllönen ◽  
Kirsi Korpijärvi ◽  
Pentti Pirkonen ◽  
Teija Paavola ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Soluble Chemical Oxygen Demand ◽  
Ultrasound Assisted

The Comparison of Substrate Changes in Microbial Fuel Cells Using Excess Sludge and Simple Anaerobic Digestion

2013 ◽  
Vol 864-867 ◽  
pp. 1839-1842
Author(s):  
Xiao Qin Zhao ◽  
Xiao Jie Sun ◽  
Su Na Wei ◽  
Jiang Cheng Liang ◽  
Yang Yang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Anaerobic Digestion ◽  
Chemical Oxygen Demand ◽  
Microbial Fuel Cells ◽  
Oxygen Demand ◽  
Control Device ◽  
Excess Sludge ◽  
Upward Trend ◽  
Air Cathode ◽  
Soluble Chemical Oxygen Demand

Based on the previous studies, this experiment presented a new kind of microbial fuel cells (MFC), single-chamber air cathode microbial fuel cells without proton membrane. After investigating the contrast of substrate changes in microbial fuel cells and simple anaerobic digestion, the analysis results of soluble chemical oxygen demand (SCOD), TP, TN and NH3-N show that: SCOD increase firstly, then decrease, to the end, descend. As a result, we find that SCOD in MFC is lower than that in control device (CD). Throughout the whole reaction period, TP in MFC is lower than that in CD. TN and NH3-N show upward trend after a reaction period.

scholarly journals Improved sludge dewaterability and hydrolysis performance after pretreatment with Fenton's reagent

2017 ◽  
Vol 77 (1) ◽  
pp. 204-210 ◽  
Author(s):  
Hongying Yuan ◽  
Yuping Yang ◽  
Jian Yuan ◽  
Yanning Wang ◽  
Yameng Song ◽  
...  
Keyword(s):  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Fenton’S Reagent ◽  
Excess Sludge ◽  
Reaction Conditions ◽  
Fenton's Reagent ◽  
Soluble Polysaccharide ◽  
Soluble Chemical Oxygen Demand ◽  
Sludge Dewaterability

Abstract The dewaterability of excess sludge significantly improved upon pretreatment with Fenton's reagent in this study. After 0.9 g/L of Fe2+ and 5.0 g/L of H2O2 were added to the sludge, and reacted for 2 h at pH = 4, the specific resistance to filtration (SRF) of the excess sludge decreased from an initial value of 29.74 × 1012 m/kg to 6.49 × 1012 m/kg. The factors that affected this improvement in sludge dewaterability as evaluated by SRF reduction showed the following order: H2O2 > pH > Fe2+ > reaction time. Furthermore, the hydrolysis performance of the sludge under the optimal reaction conditions was investigated. The results indicated that the concentration of soluble chemical oxygen demand in the supernatant increased almost 14 times compared to raw sludge, and the contents of soluble protein and soluble polysaccharide were more than 8 and 17 times higher, respectively, than for the untreated situation. However, the amounts of ammonia nitrogen (NH4+-N) and phosphate (PO43−-P) released from the sludge showed different trends: NH4+-N increased by 200%, while PO43−-P decreased by 82%. The production of volatile fatty acids (VFAs) from the treated sludge showed that total VFAs increased by 66%, and iso-butylacetic acid was the dominant product among the total VFAs.

Effect of Ultrasonic Pretreatment for the Anaerobic Digestion of Sewage Sludge

2012 ◽  
Vol 531 ◽  
pp. 528-531 ◽  
Author(s):  
Na Wei
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Oxygen Demand ◽  
High Concentration ◽  
Ultrasonic Pretreatment ◽  
Soluble Chemical Oxygen Demand ◽  
Pre Treatment ◽  
Settling Characteristics

Anaerobic digestion is an economic and environmentally friendly technology for treating the biomass material-sewage sludge, but has some limitations, such as the low efficient biogass production. In this paper ultrasound was proposed as pre-treatment for effective sludge anaerobic digestion. Sludge anaerobic digestion experiments with ultrasonic pretreatment was investigated. It can be seen that this treatment effectively leaded to the increase of soluble chemical oxygen demand(SCOD) and volatile fatty acids(VFA)concentration. High concentration of VFA leaded to a increase in biogas production. Besides, the SV of sludge was reduced and the settling characteristics of sludge was improved after ultrasonic pretreatment. It can be concluded that sludge anaerobic digestion with ultrasonic pretreatment is an effective method for biomass material transformation.

Highly efficient enhancement of municipal sludge dewaterability using persulfate activation with nZVI/HA

2019 ◽  
Vol 79 (7) ◽  
pp. 1309-1315
Author(s):  
Hao Li ◽  
Lei Song ◽  
Baohong Han ◽  
Hongwei Song ◽  
Runying Bai ◽  
...  
Keyword(s):  
Oxygen Demand ◽  
Potential Method ◽  
Municipal Sludge ◽  
Volume Percentage ◽  
Sludge Flocs ◽  
Reduction Efficiency ◽  
Initial Ph ◽  
Soluble Chemical Oxygen Demand ◽  
Persulfate Activation ◽  
Sludge Dewaterability

Abstract This study presents a sulfate radical-based oxidation method for improving municipal sludge dewaterability by combining persulfate and nanoscale zero-valent iron supported on humic acid (nZVI/HA-PS). Sludge dewaterability using persulfate activation with nZVI/HA was assessed for specific resistance to filterability (SRF), time to filter (TTF), settling volume percentage (SV30) and water content (Wc). The influencing factors, such as mass ratios of nZVI to HA, initial pH, PS dosage and nZVI/HA nanocomposite dosage, were investigated. Experimental results indicated that the SRF reduction efficiency of the sludge reached 86.47% using initial concentrations of 1.2 mmol/gVSS PS and 300 mg/L nZVI/HA. The soluble chemical oxygen demand (SCOD) of sludge supernatants increased from 79 mg/L to 710 mg/L under optimum conditioning, indicating that sludge flocs were effectively decomposed. Economic analysis demonstrated that the nZVI/HA-PS conditioning process is a potential method for improving sludge dewaterability.

Use of anaerobic hydrolysis pretreatment to enhance ultrasonic disintegration of excess sludge

2015 ◽  
Vol 73 (5) ◽  
pp. 1190-1196
Author(s):  
Xianjin Li ◽  
Tong Zhu ◽  
Yang Shen ◽  
Tianyu Chai ◽  
Yuanhua Xie ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Cell Walls ◽  
Oxygen Demand ◽  
Biochemical Properties ◽  
Excess Sludge ◽  
Disintegration Rate ◽  
Sludge Characteristics ◽  
Sludge Pretreatment ◽  
Combined Pretreatment ◽  
Reducing Energy

To improve the excess sludge disintegration efficiency, reduce the sludge disintegration cost, and increase sludge biodegradability, a combined pretreatment of anaerobic hydrolysis (AH) and ultrasonic treatment (UT) was proposed for excess sludge. Results showed that AH had an advantage in dissolving flocs, modifying sludge characteristics, and reducing the difficulty of sludge disintegration, whereas UT was advantageous in damaging cell walls, releasing intracellular substances, and decomposing macromolecular material. The combined AH–UT process was an efficient method for excess sludge pretreatment. The optimized solution involved AH for 3 days, followed by UT for 10 min. After treatment, chemical oxygen demand, protein, and peptidoglycan concentrations reached 3,949.5 mg O2/L, 752.5 mg/L and 619.1 mg/L, respectively. This work has great significance for further engineering applications, namely, reducing energy consumption, increasing the sludge disintegration rate, and improving the biochemical properties of sludge.

The Effects of Alkaline Treatment on Excess Sludge Supernatant Characteristics

2013 ◽  
Vol 361-363 ◽  
pp. 1046-1049 ◽  
Author(s):  
Ting Ting Li ◽  
Zhi Min Fu
Keyword(s):  
Ph Value ◽  
Sodium Hydroxide Solution ◽  
Alkali Treatment ◽  
Oxygen Demand ◽  
Alkaline Treatment ◽  
Maximum Amount ◽  
Batch Experiments ◽  
Excess Sludge ◽  
Initial Ph ◽  
Soluble Chemical Oxygen Demand

The effect of alkali treatment on excess sludge supernatant characteristics was studied in this experiment. 4 mol/L sodium hydroxide solution was utilized to adjust the initial pH value of excess sludge to 9.0, 11.0 and 13.0. Batch experiments were operated in 35 °C shaking bath for 12 h. The soluble chemical oxygen demand (SCOD), protein and polysaccharide concentration in excess sludge supernatant was measured every 3 h. The experimental results showed that maximum amount of protein, polysaccharide and SCOD were obtained when the initial pH value was 13.0.

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