scholarly journals Drying system of sewage sludge - wastewater treatment plant in Gdansk

2019 ◽  
pp. 157-163
Author(s):  
Hanna Obarska-Pempkowiak
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Maximum Load ◽  
Chemical Precipitation ◽  
Total Production ◽  
Mechanical Removal ◽  
Treated Sewage ◽  
Sanitary Conditions

The 'Wschod' wastewater treatment plant, with average flow of sewage equal to 110 000 m3 /day, is the biggest plant in the voyevodship of Gdansk. The volume of treated sewage amounts to 60% of the total quantity of sewage in the community of Gdansk. Until 1993 treatment of sewage was carried out in the facilities that ensured only mechanical removal of contaminants. Poor sanitary conditions of the coastal water of the Gulf of Gdansk was the main reason for introducing primary chemical precipitation (dephosphatation), using coagulant called PIX. Chemical process of precipitation resulted first of all in effective elimination of phosphates, between 77.6 - 81.8% during the period 1993-95. The removal of organic matter also improved. Due to this the load of total suspended solids in 1995 decreased by 49.1% in comparison to 1992. The removal of organic matter expressed as BOD5 and CODcr equaled respactively 34.7% and 32,8%. However, after the introduction of chemical precipitation, the increase of the sludgefrom 600 m3 /d (before introducing of chemical precipitation) to 1100 m3 /d (after introducing of chemical precipitation) was observed. For this reason it was decided to provide support for the coagulation process with anionic polimer. The anionic polimer was introduced in 1995, which resulted in the decrease of the total production of sludge to the amount of 600 - 650 m3 /d. Modernization of the WWTP also caused the necessity of replacing the formerly used method of dewatering on drying beds (total area of 7.4 ha) by mechanical dewatering in centrifuges of capacity of 8-25 m3 /h and maximum load of sludge of 800 kg DS/h. As a result the operation of the treatment plant became easier, though the problems with utilization of the sludge are not completely solved yet.

scholarly journals Isolation and characterization of organic matter-degrading bacteria from coking wastewater treatment plant

2018 ◽  
Vol 78 (7) ◽  
pp. 1517-1524 ◽  
Author(s):  
Riqiang Li ◽  
Jianxing Wang ◽  
Hongjiao Li
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Removal Rate ◽  
Treatment Plant ◽  
Coking Wastewater ◽  
Naphthalene Degradation ◽  
Isolation And Characterization ◽  
Degrading Bacteria

Abstract As a step toward bioaugmentation of coking wastewater treatment 45 bacteria strains were isolated from the activated sludge of a coking wastewater treatment plant (WWTP). Three strains identified as Bacillus cereus, Pseudomonas synxantha, and Pseudomonas pseudoaligenes exhibited high dehydrogenase activity which indicates a strong ability to degrade organic matter. Subsequently all three strains showed high naphthalene degradation abilities. Naphthalene is a refractory compound often found in coking wastewater. For B. cereus and P. synxantha the maximum naphthalene removal rates were 60.4% and 79.8%, respectively, at an initial naphthalene concentration of 80 mg/L, temperature of 30 °C, pH of 7, a bacteria concentration of 15% (V/V), and shaking speed of 160 r/min. For P. pseudoaligenes, the maximum naphthalene removal rate was 77.4% under similar conditions but at 35 °C.

scholarly journals Energy Effectiveness of Direct UV and UV/H2O2Treatment of Estrogenic Chemicals in Biologically Treated Sewage

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kamilla M. S. Hansen ◽  
Henrik R. Andersen
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Effectiveness ◽  
Treatment Plant ◽  
High Sensitivity ◽  
Electrical Energy ◽  
Continuous Exposure ◽  
Aquatic Life ◽  
Treated Sewage ◽  
Estrogenic Chemicals

Continuous exposure of aquatic life to estrogenic chemicals via wastewater treatment plant effluents has in recent years received considerable attention due to the high sensitivity of oviparous animals to disturbances of estrogen-controlled physiology. The removal efficiency by direct UV and the UV/H2O2treatment was investigated in biologically treated sewage for most of the estrogenic compounds reported in wastewater. The investigated compounds included parabens, industrial phenols, sunscreen chemicals, and steroid estrogens. Treatment experiments were performed in a flow through setup. The effect of different concentrations of H2O2and different UV doses was investigated for all compounds in an effluent from a biological wastewater treatment plant. Removal effectiveness increased with H2O2concentration until 60 mg/L. The treatment effectiveness was reported as the electrical energy consumed per unit volume of water treated required for 90% removal of the investigated compound. It was found that the removal of all the compounds was dependent on the UV dose for both treatment methods. The required energy for 90% removal of the compounds was between 28 kWh/m3(butylparaben) and 1.2 kWh/m3(estrone) for the UV treatment. In comparison, the UV/H2O2treatment required between 8.7 kWh/m3for bisphenol A and benzophenone-7 and 1.8 kWh/m3for ethinylestradiol.

scholarly journals Variable dynamics of sewage supply to wastewater treatment plant depending on the amount of precipitation water inflowing to sewerage network

2017 ◽  
Vol 33 (1) ◽  
pp. 57-63 ◽  
Author(s):  
Piotr M. Bugajski ◽  
Grzegorz Kaczor ◽  
Krzysztof Chmielowski
Keyword(s):  
Wastewater Treatment ◽  
Water Supply ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Sewerage System ◽  
Sewage System ◽  
Treated Sewage ◽  
Precipitation Water ◽  
Sewerage Network ◽  
Maximum Design

AbstractThe paper analyzes the effect of precipitation water that inflowing to sanitary sewage system as accidental water on the changes in the total amount of treated sewage. The effects of accidental water supply on the total amount of sewage inflowing to treatment plant were analyzed based on mean daily amounts from the investigated periods and mean daily amounts from incidental supplies. The study was conducted in the years 2010–2015. Six characteristic research periods were identified (one per each calendar year), when the amount of sewage in the sanitary sewage system was greater than during dry weather. The analysis of changes in the amount of sewage supplied to the sewerage system in the six investigated periods revealed that the accidental water constituted from 26.8% to 48.4% of total sewage inflowing to the wastewater treatment plant (WWTP). In exceptional situations, during intense rains, the share of precipitation water in the sewerage system would increase up to 75%. Then, the rainwater inflowing the sewerage system caused hydraulic overloading of the WWTP by exceeding its maximum design supply.

Colloidal organic matter from wastewater treatment plant effluents: Characterization and role in metal distribution

2010 ◽  
Vol 44 (1) ◽  
pp. 340-350 ◽  
Author(s):  
Isabelle A.M. Worms ◽  
Zsofia Al-Gorani Szigeti ◽  
Stephane Dubascoux ◽  
Gaetane Lespes ◽  
Jacqueline Traber ◽  
...  
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Metal Distribution
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