ANAEROBIC THERMOPHILIC DIGESTION OF SLUDGE FROM ENHANCED PRIMARY TREATMENT OF MUNICIPAL WASTEWATER

2005 ◽  
Vol 2005 (7) ◽  
pp. 8031-8042 ◽  
Author(s):  
Adalberto Noyola ◽  
Tinajero A Antonio
Keyword(s):  
Municipal Wastewater ◽  
Primary Treatment ◽  
Thermophilic Digestion

Effect of biological additives and micronutrients on the anaerobic digestion of physicochemical sludge

2005 ◽  
Vol 52 (1-2) ◽  
pp. 275-281 ◽  
Author(s):  
A. Noyola ◽  
A. Tinajero
Keyword(s):  
Anaerobic Digestion ◽  
Volatile Fatty Acids ◽  
Municipal Wastewater ◽  
Primary Treatment ◽  
Volatile Solid ◽  
The Third ◽  
Waste Sludge ◽  
Aluminium Sulfate ◽  
Batch Tests ◽  
Thermophilic Digestion

Two additives (lyophilized bacilli and enzymes) and a solution of micronutrients (Fe, Co, Ni and Mo) were tried separately and in combination, in order to assess their effect on the anaerobic digestion of waste sludge from an enhanced primary treatment (EPT) of municipal wastewater. Three batch tests were carried out in serological bottles. In the first test, addition of bacilli increased production of methane from day 11 and at day 17 the production was 95% greater than the control. In that experiment, the concentration of volatile fatty acids (VFAs) was 1,391 mg/L, 40% lower than the control. In the second test, the combination of micronutrients with bacilli, reached from the first days a better methane production than the control, 167% higher in day 17. At the end of the experiment, this combination achieved a lower concentration of VFAs and a greater percentage of volatile solid removal than the rest of the treatments. The third test was based on an experimental design in order to statistically determine the best doses of bacilli additive and micronutrients. The anaerobic thermophilic digestion of sludge from aluminium sulfate EPT will be improved with the addition of Fe: 4.5 mg/g VS, Ni: 0.75 mg/g VS, Co: 0.45 mg/g VS, Mo: 0.09 mg/g VS and bacilli additive: 12 mg/g VS.

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.

Bench to Full-Scale Enhanced Primary Treatment of Municipal Wastewater under Wet Weather Flow for Minimized Pollution Load: Evaluation of Chemical Addition and Process Control Indicators

2020 ◽  
Author(s):  
Mirna Alameddine ◽  
Abdul Rahim Al Umairi ◽  
Mohammed Zakee Shaikh ◽  
Mohamed Gamal El-Din
Keyword(s):  
Process Control ◽  
Municipal Wastewater ◽  
Weather Conditions ◽  
Primary Treatment ◽  
Full Scale ◽  
Operation Conditions ◽  
Wet Weather ◽  
Slow Mixing ◽  
Load Evaluation ◽  
Online Process

The enhanced primary treatment of municipal primary influent under wet weather conditions was studied through a comprehensive approach from bench to full scale. The study delivered a practical solution for managing seasonal fluctuations in the influent wastewater by determining the most effective operation conditions for coagulation/flocculation. Three metal-based coagulants were tested through a series of jar tests. Alum outperformed other coagulants since 1 mg of Al added as alum with low mixing was able to remove 22 NTUs, 19 mg COD and 0.8 mg ortho-P. Three-factor ANOVA indicated that TSS removal depended mostly on rapid mixing while COD and ortho-P removals depended on slow mixing and coagulant dose. In bench and full-scale operations, the addition of polymer did not lead to any pronounced improvements. Finally, turbidity and percent ultraviolet transmittance showed good correlation with TSS and ortho-P which evokes their use as surrogates for micropollutants removal and online process control.

Effect of selective organic fractions on denitrification rates using Salsnes Filter as primary treatment

2014 ◽  
Vol 69 (9) ◽  
pp. 1942-1948 ◽  
Author(s):  
V. A. Razafimanantsoa ◽  
L. Ydstebø ◽  
T. Bilstad ◽  
A. K. Sahu ◽  
B. Rusten
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Oxygen Demand ◽  
Primary Treatment ◽  
Biofilm Reactor ◽  
Biological Nutrient Removal ◽  
Particle Removal ◽  
Fine Mesh ◽  
Organic Fractions ◽  
Removal Processes

The purpose of this project was to investigate the effect of selective particle removal during primary treatment on downstream biological nutrient removal processes. Bench-scale Salsnes Filter fine mesh sieves were used as a primary treatment to obtain different organic fractions to test the effect on denitrification. Activated sludge and moving bed biofilm reactor anoxic tests were performed on municipal wastewater collected from two full-scale wastewater treatment plants located around the Oslo region (Norway). About 43% of the suspended solids in the wastewater was less than 18 μm, and 14% was between 18 and 150 μm. The effect of particulate chemical oxygen demand (COD) removal on denitrification rates was very minor.

Evaluation and testing of fine mesh sieve technologies for primary treatment of municipal wastewater

2006 ◽  
Vol 54 (10) ◽  
pp. 31-38 ◽  
Author(s):  
B. Rusten ◽  
H. Ødegaard
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Primary Treatment ◽  
Full Scale ◽  
Municipal Wastewater Treatment ◽  
Fine Mesh ◽  
Municipal Wastewater Treatment Plants ◽  
Full Scale Tests ◽  
Economical Process ◽  
Mesh Sieve

Fine mesh sieve technologies were tested in full scale at several municipal wastewater treatment plants. A screening test was used to characterize wastewater and establish the design criteria for the sieves. To achieve high removal efficiencies it was crucial to operate the sieves with a filter mat. Rotating belt sieves performed best in the full-scale tests. A small dose of cationic polymer and a static flocculator ahead of a rotating belt sieve achieved excellent results on a wastewater that was originally found unsuitable for primary treatment with fine mesh sieves. Simple screw presses dewatered the sludge from the sieves to typically 25–30% total solids. Using fine mesh sieves with <500 microns openings was found to normally be the most economical process for primary treatment.

Chemically enhanced primary treatment of municipal wastewater with ferrate(VI)

2020 ◽  
Author(s):  
Lei Zheng ◽  
Huan Feng ◽  
Yueqiang Liu ◽  
Jinshan Gao ◽  
Dibyendu Sarkar ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Primary Treatment ◽  
Chemically Enhanced Primary Treatment

Removal of helminth eggs and fecal coliforms by anaerobic thermophilic sludge digestion

2002 ◽  
Vol 45 (10) ◽  
pp. 269-274 ◽  
Author(s):  
N. Cabirol ◽  
M. Rojas Oropeza ◽  
A. Noyola
Keyword(s):  
Primary Treatment ◽  
Fecal Coliforms ◽  
Volatile Fraction ◽  
Waste Sludge ◽  
Biological Sludge ◽  
Sludge Stabilization ◽  
Sludge Digestion ◽  
Helminth Eggs ◽  
Thermophilic Conditions ◽  
Thermophilic Digestion

Anaerobic digestion of two types of waste sludge was applied in order to assess the suitability of thermophilic conditions for the stabilization of organic matter and removal of fecal coliforms and helminth eggs. Feeding sludge was taken from an activated sludge municipal facility (BS) and from an enhanced primary treatment municipal plant (EPT). As an accompanying experiment, mesophilic digesters were also operated. The four digesters (M1, M2, T1, T2) had a 5 litre volume and an egg shape. A highly stabilized material was obtained at both temperatures with BS type of sludge, taking the reduction of volatile fraction of suspended solids (%RVSS) as indicator (84% for M1 and 74% for T1). In general, EPT sludge was a more difficult substrate, if compared with BS sludge; thermophilic condition was better adapted than mesophilic for this kind of sludge. Satisfactory reductions on counts of fecal coliforms and helminth eggs were achieved under thermophilic digestion for both types of feeding sludge. T1 digester, fed with biological sludge, removed fecal coliforms below 1000 MPN/gTS and helminth eggs down to 0.28 HELarval/gTS, at an HRT of 20 days. As a general conclusion, anaerobic thermophilic digestion may be an appropriate option for sludge stabilization, in order to meet EPA Class A biosolids final disposal regulations. However, further research is needed in order to consistently remove helminth eggs and fecal coliforms from waste sludge at shorter hydraulic retention times.

Chemically assisted primary treatment of municipal wastewater

1998 ◽  
Vol 9 (5) ◽  
pp. 209-214 ◽  
Author(s):  
S.S. Younis ◽  
N.M. Al Mansi ◽  
S.H. Fouad
Keyword(s):  
Municipal Wastewater ◽  
Primary Treatment
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