scholarly journals Recovery of Water from Secondary Effluent through Pilot Scale Ultrafiltration Membranes: Implementation at Patras’ Wastewater Treatment Plant

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 663
Author(s):  
Dimitris Zagklis ◽  
Fotios K. Katrivesis ◽  
Varvara Sygouni ◽  
Lamprini Tsarouchi ◽  
Konstantina Tsigkou ◽  
...  
Keyword(s):  
Produced Water ◽  
Sewage Treatment ◽  
Settling Tank ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Physicochemical Characteristics ◽  
Pilot Scale ◽  
Sewage Water ◽  
Secondary Effluent ◽  
Ultrafiltration Membranes

Fresh water shortages affect larger areas each year due to the increased human population combined with climate change. Reuse of treated sewage water (mostly for nonpotable uses) can have a significant impact on reducing water scarcity. Ultrafiltration membranes are widely considered as a very good candidate for the remediation of this type of water. The case of Patras’ sewage treatment plant was examined for the treatment of its secondary settling tank effluent using a pilot ultrafiltration unit to produce permeate water suitable for reuse according to Greek legislation. The physicochemical characteristics of the membrane permeate stream showed significant improvements in the quality of the produced water. Turbidity was reduced by 99%, total suspended solids were decreased by more than 94%, while COD was reduced by 37%. E. coli and Enterococcus were detected at high concentrations in the feed stream but were eliminated in the membrane permeate. The results presented herein indicate that the installed equipment is capable of producing improved quality water suitable for reuse even with the strictest limits imposed by Greek legislation.

Toxicity assays and their evaluation on organic polymer flocculants used for municipal sludge dewatering

1998 ◽  
Vol 38 (7) ◽  
pp. 207-215 ◽  
Author(s):  
H. Takigami ◽  
N. Taniguchi ◽  
Y. Shimizu ◽  
S. Matsui
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Algal Growth ◽  
Pilot Scale ◽  
Organic Polymer ◽  
Municipal Sludge ◽  
Sludge Dewatering ◽  
Algal Toxicity ◽  
Reproduction Tests

The toxicity of organic polymer flocculants used for the dewatering of municipal sludge was evaluated by using two different toxicity assays: the Closterium ehrenbergii algal toxicity test and the Bacillus subtilis rec-assay. The algal toxicity of the effluents from a pilot-scale sewage treatment plant was investigated with and without the addition of a flocculant (0, 0.05, 0.10 and 0.20 mg/L). No clear evidence on the toxicity caused by the flocculant was observed on both asexual and sexual reproduction tests of C. ehrenbergii. It was also found that the algal growth inhibition of various types of flocculants (i.e., cationic, anionic, amphoionic and non-ionic) was in the order of 1 to 20 mg/L, which was mainly due to a molecular weight (MW) fraction of greater than 100,000. The results of the B. subtilis rec-assay for these flocculants indicated that eight out of ten cationic flocculants caused the direct DNA damage with LC50 =0.1 to 10 mg/L. One of the genotoxic flocculants was also fractionated into their components by MW. The experimental results showed that the lethal effects were mainly contributed by the polymer fraction of MW greater than 100,000, although the genotoxicity was not detected in that fraction. Therefore, the detected genotoxicity of the flocculants could be caused by the combined effects of various components, such as polymers, oligomers, monomers and additives.

The Project Design of Seasonal Reclaimed Water Utilization System for Liaobin Water Town

2011 ◽  
Vol 243-249 ◽  
pp. 4766-4770
Author(s):  
Ji Ku Zhang ◽  
Yang Jiang ◽  
Lin Zou
Keyword(s):  
Sewage Treatment ◽  
Reclaimed Water ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewage Water ◽  
Project Design ◽  
Water Utilization ◽  
Reuse System ◽  
Sewage Reuse ◽  
Research Analysis

Conbined with the Eco-residential Island, the project of reclaimed water utilization for Liaobin water town in Panjin is mainly introduced. The reclaimed water resource contains rainwater and domestic sewage water, which is collected mainly in the range of urban (regional).After the second-level processing by sewage treatment plant, it is mainly served as flushing water ,which is called “full-sewage” reuse system; in dry season, it is reused directly after corresponding treatment; and in rainy season, the excessive water is pumpinged into the surrounding waterbodies. The research analysis indicates that the plan of “full-sewage” reuse system and the seasonal reclaimed water utilization system used in this area are reasonable and feasible, which can make full use of the reclaimed water and save the water resources effectively, meeting the demand of sustainable development .

Experimental Studies of CS Type UV Sterilizer for the Urban Sewage Treatment

2013 ◽  
Vol 361-363 ◽  
pp. 601-605
Author(s):  
Ji Ku Zhang ◽  
Yang Yang Li ◽  
Chen Zhang ◽  
Yan Bin Yang
Keyword(s):  
Removal Rate ◽  
Sewage Treatment ◽  
Experimental Studies ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Uv Disinfection ◽  
Secondary Effluent ◽  
Urban Sewage ◽  
High Doses ◽  
Uv Dose

By treating the secondary effluent of Sanbaotun sewage treatment plant in Fushun with the CS type UV Sterilizer, the experiment researches the influence on the removal rate which includes the factors of turbidity, chromaticity, initial E.coli concentration of raw water, UV dose. The results show that the turbidity does not influence on UV disinfection efficiency with the turbidity from 1.5NTU to 3.8NTU. In the low-dose UV disinfection process, the influent sewage turbidity should under 4NTU to ensure the disinfection efficiency. Low chromaticity does not affect the UV disinfection efficiency, with the influent sewage chromaticity is under 15 degrees.The initial E. coli has a certain impact on little doses of UV disinfection with the concentration from 175 × 104 A/ L to 230 × 104 A/ L, no impact on high doses of UV disinfection。

scholarly journals Identification of Biogenic Sulphate Corrosion of Concrete in Sewage Treatment Plant Settling Tank Walls

2020 ◽  
Vol 30 (3) ◽  
pp. 253-264
Author(s):  
Łukasz Krysiak ◽  
Paweł Falaciński ◽  
Łukasz Szarek
Keyword(s):  
Sulphuric Acid ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Settling Tank ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cement Matrix ◽  
Wastewater Management ◽  
Municipal Wastewater Treatment ◽  
Biochemical Processes

Abstract One of the basic threats in terms of concrete used for tanks or ducts applied in wastewater management is the phenomenon of biogenic sulphate corrosion (BSC). BSC is a particular case of corrosion caused by the action of sulphuric acid (IV), which is formed as a result of a number of biochemical processes, which can take place, e.g. in an environment encountered within the aforementioned structures. Ions present in sulphuric acid react with cement hydration products, which leads to replacing the primary cement matrix components with compounds easily-soluble or highly-swelling during crystallization. The outcome of advanced corrosion is usually an observed formation of a white, amorphous, sponge-like mass, which is easily separated from the underlying concrete. The article discusses a case study of a BSC process in a newly constructed primary settling tank in a municipal wastewater treatment plant.

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