scholarly journals AMORPHOUS SILICA OBTAINED FROM NEPHELINE RAW MATERIALS IN THE DEPHOSPHORIZATION OF MUNICIPAL WASTEWATER

2021 ◽  
Vol 26 (2) ◽  
pp. 22-29
Author(s):  
N. V. Fokina ◽  
◽  
D. V. Mayorov ◽  
T. T. Gorbacheva ◽  
◽  
...  
Keyword(s):  
Sorption Capacity ◽  
Amorphous Silica ◽  
Phosphorus Removal ◽  
Acid Treatment ◽  
Municipal Wastewater ◽  
Pore Diameter ◽  
Raw Materials ◽  
Sewage Treatment ◽  
Sewage Treatment Plants ◽  
Fertilizing Effect

Introduction. The paper addresses the importance of extracting the labile form of phosphorus from wastewater with the possibility of its further use. The advantages of sorption methods and the prospects of using amorphous silica as an ameliorant with a prolonged fertilizing effect are considered. Methods. We performed experimental modeling of phosphates extraction from model solutions and a sludge mixture from regional sewage treatment plants. Amorphous silica obtained from local nepheline raw materials in acid treatment using a patented technology was used as sorbents. Results. A sorbent based on amorphous silica with a pore diameter of 8.41 nm was obtained. Its sorption capacity exceeds 29 mgP/g in the phosphate form, which corresponds to the average level of phosphorus removal, noted for a number of sorbents used in the international practice of wastewater dephosphorization when producing unconventional ameliorants. Conclusion. For effective phosphorus removal from municipal wastewater to obtain an unconventional ameliorant with a fertilizing effect in terms of Si and P, sorbent consumption of 1 g/l is sufficient.

Operation Experiences with Biological Phosphorus Removal at the Sewage Treatment Plants of Berlin (West)

1991 ◽  
Vol 24 (7) ◽  
pp. 133-148 ◽  
Author(s):  
A. Peter ◽  
F. Sarfert
Keyword(s):  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Chemical Precipitation ◽  
Biological Phosphorus Removal ◽  
Treatment Results ◽  
Sewage Treatment Plants ◽  
Research Activities ◽  
Two Stages ◽  
The Given ◽  
Biological Phosphorus

In investigations concerning sludge bulking in Berlin enhanced biological phosphorus removal was first observed unexpectedly. Because since 1986 an officially preset limit of 2 mg TP/l must be kept in all Berlin wastewater discharges it was decided to explore the capabilities of the observed mechanism under the specific circumstances of the exciting two large treatment plants in Ruhleben (240,000 m3/d) and Marienfelde (100,000 m3/d). For this purpose some of the existing units at both plants were equipped with anaerobic zones which were generated mainly by process modifications. Additionally stage one of the Ruhleben plant was altered completely in order to investigate the combination of biological phosphorus and nitrogen removal as a special pilot study in three parallel trains. The research activities and treatment results gained in each of the two stages of the Ruhleben and in the Marienfelde plant are reported in detail. For example BOD-related phosphorus removal rates were obtained ranging from 2.3-4.5 mg TP per 100 mg BOD removed. It must be stressed that all examinations were performed on full-scale conditions. At present the given limit of 2 mg TP/l in the Ruhleben plant is met without any chemical precipitation at least on average. From the beginning biological phosphorus removal will be integrated into further projected extensions.

scholarly journals Regulatory and technological prerequisites of the use of sewage sludge for the production of organic fertilizers

2020 ◽  
pp. 162-170
Author(s):  
R. Edgecock ◽  
V. V. Bratishko ◽  
I. V. Zinchenko ◽  
S. H. Karpus ◽  
D. O. Milko ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Raw Materials ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Raw Material ◽  
Organic Fertilizers ◽  
Mineral Fertilizers

Annotation Purpose. Summarize the regulatory and technological requirements for the production of organic (organo-mineral) fertilizers on the base of sewage sludge. Methods. Analysis and generalization of the requirements of regulatory documents on the management of organic waste and their use as raw materials for the production of organic fertilizers and soil improvers. Results. The current legislative, departmental and regulatory documentary base in Ukraine concerning the treatment of sediment resulting from biological sewage treatment at municipal wastewater treatment plants for its further use in agriculture as fertilizers is analysed. Indicators are identified and analysed to determine the possibility, feasibility, efficiency and scope of organic fertilizers produced using sewage sludge. The analysis of changes in the content of organic matter and total nitrogen in the sewage sludge during its storage at the sewage treatment plant sites is presented. The technological feasibility of using sludge of different shelf life in composting production has been determined. Conclusions 1. The regulatory framework of Ukraine contains a sufficiently complete list of indicators that should be met by organic raw materials (sewage sludge) for further use as organic fertilizers. Some of these indicators – bio security and heavy metals content – can be improved in the composting process of fertilizers. 2. Fresh sediment, as well as sediment accumulated in the last late autumn and winter periods, is of main value for use as a raw material in the production of organic fertilizers. 3. The use in the production of compost sludge stored on sludge sites for a period of half a year or more requires special control of the process of decontamination. In this case, it is advisable to use additional means of wastewater decontamination. Keywords: heavy metals, manure, humus, decontamination, composting, organic fertilizers, sewage sludge.

scholarly journals Risk Assessment Analysis in a Municipal Wastewater Treatment Plant

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 18
Author(s):  
Magdalena Łój-Pilch ◽  
Anita Zakrzewska ◽  
Ewa Zielewicz
Keyword(s):  
Risk Assessment ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Municipal Sewage ◽  
Proper Function ◽  
Municipal Wastewater Treatment ◽  
Sewage Treatment Plants

Risk management, an aspect of which is risk assessment, is a process supporting the proper function of municipal sewage treatment plants. Many factors affect the quality of treated wastewater. Risk assessment, its analysis, and hierarchization permit the elimination of events with the most destructive impacts on the purification process.

Extension of the Sewage Treatment Plants in Stockholm: Some Technical and Economical Aspects

1993 ◽  
Vol 27 (5-6) ◽  
pp. 357-367 ◽  
Author(s):  
J. Hultgren ◽  
L. G. Reinius
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Good Chance ◽  
Sewage Treatment Plants ◽  
Treated Sewage ◽  
The Future ◽  
Future Extension ◽  
The City

The requirements for the sewage treatment plants in Sweden will be more stringent in the future. The three plants in Stockholm, Henriksdal, Bromma and Loudden have to be extended to meet requirements for nitrogen removal and increased phosphorus removal. Since 1989 the plants have the same recipient for the treated sewage and to save money during the future extension the city would like to regard the three effluents as one common. The authorities have not yet decided to admit this but there is a good chance for it. The paper describes the strategy for extension and how the plants have been designed.

scholarly journals Economic Evaluation on the Production of Poly-DADMAC and Sepiolite Nanocomposite

2021 ◽  
Vol 1 (1) ◽  
pp. 162-172
Author(s):  
Dita Ayu Rosmawati ◽  
◽  
Azzahra Annur Rizqia ◽  
Sifathul Jannah ◽  
Nissa Nur Azizah ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Raw Materials ◽  
Sewage Treatment ◽  
Sewage Treatment Plants ◽  
The Third ◽  
Coagulation And Flocculation ◽  
Total Profit ◽  
Pre Treatment ◽  
Economic Perspectives ◽  
One Year

Some agricultural wastes are not suitable for direct disposal to standard sewage treatment plants and pre-treatment is required to avoid clogging by colloidal materials. One of the pre-treatment stages is coagulation and flocculation. In several studies, the mixture of polymer and clay fulfills the properties of coagulant and flocculant materials. A mixture of poly-DADMAC polymer and sepiolite clay can be used as a coagoflocculant at the same time. This study aims to analyze whether a project to manufacture clay polymer nanocomposites is feasible or not. By taking into account various perspectives including engineering and economic perspectives, this project is considered prospective to be carried out. This is indicated by the increase in the Profitability Index (PI) value of 5.33658 in the third year from -0.00975 which was the PI value the previous year. In twenty-four hours, the project can produce approximately 8.25 tonnes of adsorbent. The total profit earned in one year reaches 719,738.04 USD when run under ideal conditions. Apart from the results of the economic analysis mentioned, this project is also very effective in terms of time because it is simple and the raw materials needed are abundant

EMERGING TRENDS IN ELECTRICAL ENERGY USAGE AT CANADIAN (ONTARIO) MUNICIPAL WASTEWATER TREATMENT FACILITIES AND STRATEGIES FOR IMPROVING ENERGY EFFICIENCY

1994 ◽  
Vol 30 (4) ◽  
pp. 17-23 ◽  
Author(s):  
B. Evans ◽  
P. Laughton
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Energy Savings ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Target Area ◽  
Municipal Wastewater Treatment ◽  
Sewage Treatment Plants ◽  
The Impact ◽  
Ontario Hydro

The province of Ontario is Canada's most populous province with over 8 million residents out of a total population of 27 million. The Province is situated in the eastern portion of North America and stretches from 41°N to 50° N. All the Great Lakes fall within Ontario's boundaries and the Province is estimated to have over 280,000 lakes. The area along Lake Ontario is home to 5 million of the residents who are serviced by 11 large sewage treatment plants. The remaining 403 treatment plants are scattered throughout the province. with an average size of 20 000 m3/d. Ontario Hydro commissioned a study of the wastewater treatment plants to identify the main power users at the various types of sewage treatment plants, as well as potential areas within each plant where significant energy savings could be generated. By using this information, Ontario Hydro hoped to assess the potential to reduce the load and identify any electrical efficiency improvements, fuel switching and load shifting opportunities that may exist as well as the impact of environmental regulations on power saving initiatives. It was found that several major opportunities existed. These included:■ that up to 25% of power currently used can be reduced by introducing energy efficient measures■ of all the unit operations in wastewater treatment plants, aeration accounts for 42% of the power usage, influent and effluent pumping - 20%, and dewatering - 6%. Of this influent and effluent pumping, specifically influent represented the best target area as significant aeration system upgrade had already taken place.

The Depth of Phosphorus Removal by Three Coagulations

2011 ◽  
Vol 356-360 ◽  
pp. 1575-1580
Author(s):  
Kai Li ◽  
He Jie Xu ◽  
Chen Gu
Keyword(s):  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Settling Tank ◽  
Ferric Sulfate ◽  
Sewage Treatment Plants ◽  
Urban Sewage ◽  
Hydraulic Conditions ◽  
Removal Efficiencies ◽  
Secondary Settling ◽  
Polyaluminium Chloride

Using the secondary settling tank effluent, this paper is going to research the potentials of three coagulations (polyaluminium chloride, ferric sulfate, and self-polymeric aluminum ferric) in deep chemical phosphorus removal by the beaker experiment. The experiment focuses on the dosages, the hydraulic conditions of coagulation and effect of pH on the removal. The results show that three coagulants have good efficiencies in phosphorus removal. After coagulant treatments, phosphorus can be decreased below 0.5mg/L and achieve Grade A standards of urban sewage treatment plants (GB18918-2002). The removal efficiencies of polymer silicate are superior to those of poly aluminum chloride and polymeric ferric sulfate.

Process Requirement for Phosphorus Removal at Activated Sludge Sewage Treatment Plants

1974 ◽  
Vol 9 (1) ◽  
pp. 262-271
Author(s):  
T. A. Constantine ◽  
K. Yu ◽  
W. J. Shaffner
Keyword(s):  
Activated Sludge ◽  
Ferric Chloride ◽  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Solid Content ◽  
Sewage Treatment Plants ◽  
City Of London ◽  
The City ◽  
Final Effluent ◽  
Chemical Pump

Abstract The results of bench-scale and full-scale studies for nutrient removal at four activated sludge plants in the City of London were reported. The objective of 1 mg/l of phosphorus in final effluent was met by the addition of ferric chloride or lime. The choice of chemical, the required chemical dosages and the efficiency of phosphorus removal were found to be dependent on the location of the chemical addition point, the hydraulic loading of clarifier and the conditions of the sludge. Pacing of chemical pump by the plant flow signal was found to be satisfactory. Good sedimentation of the phosphate floc was obtained with overflow rate of 600 IGPD/ft2 using lime and over 1000 IGPD/ft2 using ferric chloride. Lime increased the solid content but decreased the volume of the sludge. Ferric chloride did not significantly alter the characteristic of the sludge other than the colour.

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