Two-stage UASB concept for treatment of domestic sewage including sludge stabilization process

1995 ◽  
Vol 32 (11) ◽  
Keyword(s):  
Domestic Sewage ◽  
Two Stage ◽  
Stabilization Process ◽  
Sludge Stabilization

scholarly journals Sewage sludge addition modifies soil microbial communities and plant performance depending on the sludge stabilization process

2016 ◽  
Vol 101 ◽  
pp. 37-46 ◽  
Author(s):  
Eva Lloret ◽  
José A. Pascual ◽  
Eoin L. Brodie ◽  
Nicholas J. Bouskill ◽  
Heribert Insam ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Microbial Communities ◽  
Soil Microbial Communities ◽  
Plant Performance ◽  
Stabilization Process ◽  
Soil Microbial ◽  
Sludge Stabilization

scholarly journals Yield and nutrition of sunflower fertilized with sewage sludge stabilized by different processes

Revista CERES ◽  
2013 ◽  
Vol 60 (5) ◽  
pp. 683-689 ◽  
Author(s):  
Altina Lacerda Nascimento ◽  
Regynaldo Arruda Sampaio ◽  
Luiz Arnaldo Fernandes ◽  
Geraldo Ribeiro Zuba Junio ◽  
João Paulo Carneiro ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Biological Properties ◽  
Chemical Fertilizer ◽  
Control Treatment ◽  
Sludge Treatment ◽  
Stabilization Process ◽  
Sludge Stabilization ◽  
Physical Chemical ◽  
Sunflower Crop ◽  
Sewage Sludge Treatment

The different methods of sewage sludge stabilization modify their physical chemical and biological properties, altering its efficiency when applied in agriculture. The objective of this study was to evaluate the nutrient levels in soil and the yield of sunflower fertilized with sewage sludge stabilized by different processes. The experiment was conducted in Cambisol, with the treatments: control (without fertilization), fertilization with sewage sludge solarized, composted, vermicomposted, limed and chemical fertilizer recommended for sunflower crop. The experimental design a randomized block with four replications. The different methods of sewage sludge treatment did not affect the yield; however, the application of sewage sludge, regardless the stabilization process adopted, was more effective than chemical fertilizer and the control treatment. Overall, fertilization with limed sewage sludge provided higher soil nutrients concentrations, while treatments with composted and vermicomposted sewage sludge showed higher levels of nutrients in the plant.

Two-stage UASB concept for treatment of domestic sewage including sludge stabilization process

1995 ◽  
Vol 32 (11) ◽  
pp. 55-63 ◽  
Author(s):  
S. K. I. Sayed ◽  
M. A. A. Fergala
Keyword(s):  
Granular Sludge ◽  
Domestic Sewage ◽  
Conversion Ratio ◽  
Uasb Reactor ◽  
Treatment Efficiency ◽  
Second Stage ◽  
Sludge Stabilization ◽  
Three Phase ◽  
Phase Separator ◽  
Uasb Reactors

A multi-target study was conducted to assess the feasibility of the UASB-reactor system for the anaerobic treatment of raw domestic sewage (low-strength complex wastewater; CODtot=200-700 mg/l and CODss=45-55% of CODtot) combined with sludge stabilization process under a moderate temperature of 18-20 °C. The study has produced a design of a modified Three-Phase Separator (TPS) to control the sludge retention inside the UASB reactors as well as the determination of design parameters of the treatment process viz. the hydraulic retention time (HRT), the potential period of loading the UASB reactors and the most convenient digestion time required for advanced sludge stabilization. The study was performed in a Two-Stage Flocculent-Granular-Sludge UASB-reactor system. The first stage consisted of two identical UASB reactors seeded with flocculent sludge and operated alternately (i.e. one reactor was fed while the other was unfed for the stabilization of the sludge). The second stage consisted of one UASB reactor seeded with granular sludge and was operated continuously. The feed period and the corresponding feedless period of the first stage were two days. The results study have shown that the removal efficiency of the COD increases considerably with the decrease of the HRT, as a treatment efficiency of 75% was achieved at HRT=10 h (8 h for Stage I and 2 h for Stage II), while the treatment efficiency was 84% at HRT=6 h (4 h for Stage I and 2 h for Stage II). In contrast to the above the extent of sludge stabilization (i.e. conversion into methane) for the first stage of the system was directly proportional to the HRT as 41% of the removed CODtot was converted into methane at HRT=8 h, the conversion ratio decreased to 28% at HRT=4 h. For the granular sludge (the second stage of the system), the conversion ratio of the removed CODtot into methane was almost stable in the range of 17-20%. The percentages CODpaper-filtered of the CODtot were 85-90% and 92-97% for the effluents of the first and second stages respectively with the conclusion that the modified Three-Phase Separator (TPS) has a satisfactory operational potential.

Treatment of strong domestic sewage in a 96 m UASB reactor operated at ambient temperatures: two-stage versus single-stage reactor

2005 ◽  
Vol 96 (5) ◽  
pp. 577-585 ◽  
Author(s):  
M HALALSHEH ◽  
Z SAWAJNEH ◽  
M ZUBI ◽  
G ZEEMAN ◽  
J LIER ◽  
...  
Keyword(s):  
Domestic Sewage ◽  
Single Stage ◽  
Uasb Reactor ◽  
Stage Versus ◽  
Two Stage ◽  
Ambient Temperatures

A Complete Treatment of Slaughterhouse Wastewater Combined with Sludge Stabilization Using Two Stage High Rate UASB Process

1993 ◽  
Vol 27 (9) ◽  
pp. 83-90 ◽  
Author(s):  
S. K. I. Sayed ◽  
H. van der Spoel ◽  
G. J. P. Truijen
Keyword(s):  
Suspended Solids ◽  
High Rate ◽  
Anaerobic Sludge ◽  
Digestion Time ◽  
Two Stage ◽  
Second Stage ◽  
Sludge Stabilization ◽  
Complete Treatment ◽  
Uasb Reactors ◽  
Stabilization Period

The main objectives of the present investigations were to assess the feasibility of two stage high rate UASB-reactors for complete treatment of slaughterhouse wastewater which contains approximately 55 % insoluble coarse suspended COD. The study presented in this paper addresses the maximum loading rates (hydraulic and organic) the extent of sludge stabilization (i.e. conversion into methane) and the length of the sludge stabilization period (i.e. digestion time). The experiments were performed in two stage high rate anaerobic sludge UASB-reactors. The wastewater treatment experiments were performed at an operational temperature of 18 °C, while the sludge stabilization experiments were performed at a process temperature of 30 °C. Two different types of anaerobic sludge were used in this experiment: flocculent sludge for the first stage and granular for the second stage of the system. The first stage of the reactor system consists of 2 reactors which are used alternately. In the second stage, one reactor is in operation permanently. The results of the present study indicate that the system can satisfactorily handle organic space loads up to 15 kg COD m−3.day−1 at a liquid retention time of 4 h and 1.5 h. for the first and second stage of the system, respectively. For the whole system a treatment efficiency up to 90 % on CODtotal basis, 95 % on CODcoarse suspended solids basis, 80 % on CODcolloidal basis and 80% on CODsoluble basis was achieved. The maximum extent of sludge stabilization (i.e. conversion into methane) at 30 °C was approximately 50 % for the accumulated coarse suspended solids and colloidal fractions in the reactors of the first stage of the system. The length of the sludge stabilization period (i.e. digestion time) was 14 days.

Two Stage Sludge Stabilization

1987 ◽  
Vol 19 (7) ◽  
pp. 1247-1250 ◽  
Author(s):  
N. J. Dichtl
Keyword(s):  
Residence Time ◽  
Pilot Scale ◽  
Preliminary Treatment ◽  
Combined Method ◽  
Two Stage ◽  
Advantages And Disadvantages ◽  
One Stage ◽  
Sludge Stabilization ◽  
Mesophilic Digestion ◽  
Theoretical Considerations

For the stabilization of sludges, theoretical considerations were used to determine a multiple stage ‘Method of Procedure', in order to estimate the advantages and disadvantages of such a procedure. For the procedure, combinations of mesophilic digestion with preceding aerobic-thermophilic or aerobic-mesophilic preliminary treatment as well as anaerobic-thermophilic preliminary treatment, were carried out at a technical pilot scale, in order to quantify the expected advantages compared to one-stage mesophilic digestion. It appeared that, depending on the aim of the process, a two-stage or combined method would give clear advantages either in respect of minimized residence time and desired disinfection, or in respect of all costs for the process.

Sign in / Sign up

Export Citation Format

Share Document