scholarly journals Investigating the effects of different cationic charge flocculation polymers on municipal wastewater sludge dewatering

2021 ◽  
Author(s):  
Megan Abrahams ◽  
Mujahid Aziz ◽  
Godwill Kasongo
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Operating Cost ◽  
Wastewater Sludge ◽  
Municipal Wastewater Treatment ◽  
Bench Scale ◽  
Treated Effluent ◽  
Solids Concentration ◽  
Municipal Wastewater Treatment Plants ◽  
Polymer Flocculant

Abstract The minimization of sludge produced by municipal wastewater treatment plants (MWWTPs) is critical as its handling accounts for approximately 50% of the total operating cost. The challenges in predicting dewatering performance can be overcome by optimizing the sludge treatment process, especially conditioning and dewatering. This study aimed to investigate sludge dewaterability at four different MWWTPs, using a gravity drainage test unit and a bench-scale press. The effect of differently treated effluent used as a solvent to mix the flocculation polymers was observed during dewatering. The membrane bioreactor (MBR) treated effluent yielded the highest filtrate volume in the lowest amount of time, with the least polymer flocculant dosage. The Box Behnken Design model fitted the data and proved a relationship between polymer dosage, cake solids concentration, and cake height during the bench-scale press tests.

Experimental Determination of Thermal Characteristics of Wastewater Sludge for Design of Incineration Plants

2017 ◽  
Vol 21 (3) ◽  
pp. 32-35
Author(s):  
P.V. Khoreva ◽  
I.M. Bernadiner
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Experimental Studies ◽  
Thermal Characteristics ◽  
Wastewater Sludge ◽  
Municipal Wastewater Treatment ◽  
Water Problem ◽  
Discharge Regulation ◽  
Regulation Mechanisms ◽  
Municipal Wastewater Treatment Plants

Current trends of improving of wastewater discharge regulation mechanisms in centralized municipal systems of sewage disposal and in water bodies, the tightening of the requirements for the quality of wastewater, stimulate the development of technologies for their treatment. While improving the quality characteristics of the treated water, problem of formation and subsequent disposal of large source of waste – wastewater sludge (WS) – remains unresolved to date. There were presented information confirming the increase in the volumes of WS produced at municipal wastewater treatment plants. There were presented results of experimental studies on the effect of the thermal characteristics of sludge on the process of their incineration.

scholarly journals Experience of using sewage sludge in soil for green building

2022 ◽  
Vol 42 ◽  
pp. 03001
Author(s):  
Irina Elshaeva ◽  
Vera Titova ◽  
Alexander Vetchinnikov ◽  
Anna Pinaeva ◽  
Oksana Vetchinnikova
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Green Building ◽  
Wastewater Sludge ◽  
Organic Soils ◽  
Municipal Wastewater Treatment ◽  
Soil Components ◽  
Municipal Wastewater Treatment Plants ◽  
Lawn Maintenance

Wastewater sludge from municipal wastewater treatment plants in Nizhny Novgorod and soils based on them, prepared with different ratios of sludge, sawdust and peat, have been investigated. Sewage sludge-based soils contain plant nutrients and are suitable for use as fertilizing materials in green building. Under the conditions of a three-year lysimetric experiment on cereal lawn grasses, a significant efficiency of organic soils was noted in comparison with traditional soils. The lawn maintenance regime revealed differences in the mixtures of fertilizing materials in terms of the effect on the productivity of the phytocenosis. Use of sewage sludge containing large amounts of heavy metals as one of the soil components undoubtedly leads to increase in the amount of these toxic elements in the soil as a whole.

Unexpected declines in stream phosphorus concentrations across southern Ontario

2014 ◽  
Vol 71 (3) ◽  
pp. 337-342 ◽  
Author(s):  
Shanel M. Raney ◽  
M. Catherine Eimers
Keyword(s):  
Municipal Wastewater ◽  
Agricultural Land ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Southern Ontario ◽  
Treated Effluent ◽  
Time Period ◽  
Long Term Trends ◽  
Municipal Wastewater Treatment Plants ◽  
Almost All

Long-term trends (1975–2010) in total phosphorus (TP) concentrations were evaluated at 113 stream stations across southern Ontario. Declines in TP were evident at the majority of sites (68%), including those both with (n = 49) and without (n = 64) upstream municipal wastewater treatment plants (MWWTP). Although declines in TP at stream stations downstream of MWWTPs may be attributed to improvements in P removal from treated effluent, declines at the remaining streams must be attributed to other causes. During the same time period, increases in chloride (Cl−) were observed at almost all (95%) of the 64 MWWTP-free stations. Over the past 35 years, urban land cover has increased at the expense of agricultural land area in Ontario, with the majority of these changes occurring in southern Ontario. The coincidence of declines in TP and increases in Cl− at the 64 MWWTP-free streams suggests that the two may be related, with P-rich agricultural fields being replaced with impervious surfaces and therefore increased road salt applications.

Effects of ozone treatment on the biodegradability of sludge from municipal wastewater treatment plants

2002 ◽  
Vol 46 (4-5) ◽  
pp. 421-425 ◽  
Author(s):  
I.T. Yeom ◽  
K.R. Lee ◽  
Y.H. Lee ◽  
K.H. Ahn ◽  
S.H. Lee
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Aerobic Condition ◽  
Experimental Period ◽  
Wastewater Sludge ◽  
Aerobic Biodegradation ◽  
Ozone Treatment ◽  
Municipal Wastewater Treatment ◽  
Ozone Pretreatment ◽  
Municipal Wastewater Treatment Plants

The effects of ozone pretreatment on the biodegradability of municipal wastewater sludge were determined. Three types of experiments were conducted: anaerobic digestion, aerobic biodegradation, and denitrification using ozone-treated sludge as a carbon source. For 5 days, ozonated sludge at 0.1 gO3/g-SS showed about 2-3 times greater biodegradation compared to the raw sludge in both aerobic and anaerobic conditions. In anaerobic experiments, biodegradation increased with ozone dosage up to 0.2 gO3/g-SS. Further increase of ozone dosage did not improve the biodegradation. In aerobic condition, about 77% of the ozonated sludge at 0.1 gO3/g-SS could be biodegraded after 15 days and is compared with 36% degradation of the untreated sludge. Most of the biodegradation of the ozonated sludge occurred within 5 days while the raw sludge was biodegraded steadily throughout the experimental period. The biodegradation enhancement of ozonated sludge was confirmed in batch denitrification experiments.

scholarly journals Heavy metal content of Swedish municipal wastewater sludge – status and goals

2017 ◽  
Vol 76 (4) ◽  
pp. 869-876 ◽  
Author(s):  
A. Mattsson ◽  
A. Finnson ◽  
D. I'Ons
Keyword(s):  
Heavy Metal ◽  
Municipal Wastewater ◽  
Agricultural Land ◽  
Wastewater Treatment Plants ◽  
Arable Land ◽  
Wastewater Sludge ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plants ◽  
Source Management

In 2014, 25% of the sludge produced at Swedish municipal wastewater treatment plants was applied to agricultural land. Even though the Swedish heavy metal limits for sludge to be used in agriculture are amongst the most stringent in the EU, more stringent heavy metal limits are proposed. Most sludge applied to agricultural land is recycled within a certification system, Revaq. Revaq has targets for control at source management and improvement of sludge quality. Statistics based on data collected within the Revaq system was used to differentiate between local and general sources of heavy metals and assess the need to improve sludge quality. The analysis indicates that proposed future national limits on the quality of the sludge can be met by most of the sludge. The improvement needed for about 20% of the sludge is feasible through local control at source management. The levels of cadmium, copper and mercury need to be reduced if these metals are not to limit the amount of sludge that may be applied per unit area of arable land. Finally, the long term Revaq targets for cadmium and silver will be difficult to meet.

The rheology of sewage sludge at different steps of treatment

1997 ◽  
Vol 36 (11) ◽  
pp. 79-85 ◽  
Author(s):  
V. Lotito ◽  
L. Spinosa ◽  
G. Mininni ◽  
R. Antonacci
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Rheological Behaviour ◽  
Rheological Parameters ◽  
Municipal Wastewater Treatment ◽  
Rotational Viscometer ◽  
Bingham Plastic ◽  
Solids Concentration ◽  
Municipal Wastewater Treatment Plants

Rheological parameters are very important in sewage sludge management, not only as designing parameters in transporting, storing, landfilling and spreading operations, but also as controlling ones in many treatments, such as stabilisation and dewatering. To study how different treatments affect sludge rheological behaviour, research has been undertaken at CNR-Istituto di Ricerca Sulle Acque (CNR-IRSA), and the preliminary results are discussed in this paper. Sludge samples taken from three municipal wastewater treatment plants at different steps of treatment have been tested by a rotational viscometer and data interpreted through both Bingham plastic and Ostwald pseudoplastic models. Coefficients of those models have been then correlated to solids concentration. Results confirmed that solids concentration is the main parameter affecting sludge rheology and evidenced that a single parameter is not sufficient to represent the rheological behaviour, thus indicating that other parameters should be introduced and characteristics considered for a better understanding of the phenomenon.

APPLICATION OF ORGANIC FLOCCULANTS FOR THE TREATMENT OF SLUDGE FROM MUNICIPAL WASTEWATER TREATMENT PLANTS

2013 ◽  
Vol 12 (1) ◽  
pp. 163-166 ◽  
Author(s):  
Mariana Turcu ◽  
Valentin Nedeff ◽  
Narcis Barsan ◽  
Emilian Florin Mosnegutu ◽  
Mirela Panainte
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plants

A study about the use of chemicals in conventional tertiary treatment. Performances comparison of three municipal wastewater treatment plants and pilot plant experiences

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
A. Iborra-Clar ◽  
J.A. Mendoza-Roca ◽  
A. Bes-Pií ◽  
J.J. Morenilla-Martínez ◽  
I. Bernácer-Bonora ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Pilot Plant ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Wastewater Reclamation ◽  
Valencian Region ◽  
Municipal Wastewater Treatment Plants

Rainfall diminution in the last years has entailed water scarcity in plenty of European regions, especially in Mediterranean areas. As a consequence, regional water authorities have enhanced wastewater reclamation and reuse. Thus, the implementation of tertiary treatments has become of paramount importance in the municipal wastewater treatment plants (WWTP) of Valencian Region (Spain). Conventional tertiary treatments consist of a physico-chemical treatment of the secondary effluent followed by sand filtration and UV radiation. However, the addition of coagulants and flocculants sometimes does not contribute significantly in the final water quality. In this work, results of 20-months operation of three WWTP in Valencian Region with different tertiary treatments (two without chemicals addition and another with chemicals addition) are discussed. Besides, experiments with a 2 m3/h pilot plant located in the WWTP Quart-Benager in Valencia were performed in order to evaluate with the same secondary effluent the effect of the chemicals addition on the final water quality. Results showed that the addition of chemicals did not improve the final water quality significantly. These results were observed both comparing the three full scale plants and in the pilot plant operation.

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