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

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 New ultrasound assisted chemical oxygen demand determination

2002 ◽  
Vol 9 (3) ◽  
pp. 143-149 ◽  
Author(s):  
Antonio Canals ◽  
Angel Cuesta ◽  
Luis Gras ◽  
Ma Remedios Hernández
Keyword(s):  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Ultrasound Assisted

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.

Effect of Ultrasonic Energy Density of Ultrasonic Sludge Hydrolysis

2015 ◽  
Vol 1092-1093 ◽  
pp. 844-847
Author(s):  
Yu Chen ◽  
Lin Hao ◽  
Dong Mei Wang
Keyword(s):  
Energy Density ◽  
Sewage Sludge ◽  
Ultrasonic Treatment ◽  
Oxygen Demand ◽  
Low Energy ◽  
Evaluation Index ◽  
Index Study ◽  
Sludge Hydrolysis ◽  
Soluble Chemical Oxygen Demand ◽  
Hydrolysis Of

Regard the added soluble chemical oxygen demand value (SCOD), TN, TP, VFA as the evaluation index, study the hydrolysis effect of different ultrasonic intensity of sewage sludge. The results show that: with the energy density of 0.75W/L, 1.5W/L, 3W/L after ultrasonic treatment of sludge, SCOD than the original clay increased a lot. Hydrolysis of five days later, having little difference of SCOD concentration in the sludge, and the 0.75W/L SCOD reached the peak, indicating little sound energy density difference of SCOD in sludge, and the low energy density effected better, while the concentration of TN, TP, VFA were increased with the increase of the energy density.

Treatment of anaerobically digested dairy manure in a two-stage biofiltration system

2012 ◽  
Vol 65 (11) ◽  
pp. 1975-1981 ◽  
Author(s):  
Mengjing Xia ◽  
Wendong Tao ◽  
Ziyuan Wang ◽  
Yuansheng Pei
Keyword(s):  
Chemical Oxygen Demand ◽  
Nitrogen Removal ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Dairy Manure ◽  
Ammonium Oxidation ◽  
Two Stage ◽  
Sand Filters ◽  
Soluble Chemical Oxygen Demand ◽  
Anaerobically Digested Dairy Manure

High concentrations of ammonium and phosphate present a challenge to cost-effective treatment of anaerobically digested dairy manure. This study investigated the efficacy of a two-stage biofiltration system for passive treatment of digested dairy manure. The first stage pebble filters were batch loaded. When the slurry-like digested dairy manure was retained on pebble beds, soluble contaminants were removed before liquid infiltrated over 8–17 days. The pebble filters removed 70% of soluble chemical oxygen demand, 71% of soluble biochemical oxygen demand, 75% of ammonium, and 68% of orthophosphate. Nitrogen removal was attributed to the conventional nitrification – denitrification process and novel nitritation – anammox process. Aerobic ammonium oxidizing and anammox bacteria accounted for 25 and 23% of all bacteria, respectively, in the filtrate of the pebble filters. The longer it took for filtration, the greater the removal efficiency of soluble contaminants. The second stage sand filters had removal efficiencies of 17% for soluble chemical oxygen demand, 45% for soluble biochemical oxygen demand, 43% for ammonium, and 16% for orthophosphate during batch operations at a hydraulic retention time of 7 days. Aerobic ammonium oxidation and anammox were primarily responsible for nitrogen removal in the sand filters. Vegetation made an insignificant difference in treatment performance of the sand filters.

scholarly journals Influence of acidogenic fermented fish by-products with rice bran for sludge reduction and biogas recovery in anaerobic co-digestion

2020 ◽  
Vol 26 (1) ◽  
Author(s):  
Hee-Jeong Choi
Keyword(s):  
Sewage Sludge ◽  
Chemical Oxygen Demand ◽  
Rice Bran ◽  
Tap Water ◽  
Oxygen Demand ◽  
Lag Phase ◽  
Sludge Reduction ◽  
Acidogenic Fermentation ◽  
Volatile Solids ◽  
By Products

The purpose of this study was to investigate the effects of acidogenic fermentation broth with rice bran (RFFB), tap water (TFFB), or raw fishery by-products (FBs) on sludge reduction and biogas production in an anaerobic co-digestion process. Acidogenic fermentation of FBs with rice bran was faster and produced more volatile fatty acids than that with tap water. Reduction efficiencies for chemical oxygen demand, volatile solids, and total solids were highest in RFFB. In the kinetic analysis, λ (d), which represents the duration of the lag phase, was shortest with RFFB (1.09 d) and highest in sewage sludge (8.86 d). As the loading amount of volatile solids and chemical oxygen demand increased, the amount of cumulative biogas also increased. Amount of produced methane and energy recovery were highest with RFFB (5.71 kWh). Anaerobic co-digestion of FFB and sewage sludge allowed reduced sludge and recovered energy using the discarded waste as an organic carbon source.

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