Toxicity Screening Tests for Wastewater Treatment Plants – I

2005 ◽  
pp. 559-568
Author(s):  
Jin Hwa Park ◽  
Yong Woo Yl
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Screening Tests ◽  
Toxicity Screening

Toxicity Screening Tests for Wastewater Treatment Plants – I

2005 ◽  
Vol 277-279 ◽  
pp. 559-568
Author(s):  
Jin Hwa Park ◽  
Yong Woo Yl
Keyword(s):  
Electron Transfer ◽  
Wastewater Treatment Plants ◽  
Domestic Wastewater ◽  
Strong Relationship ◽  
Domestic Sewage ◽  
Screening Tests ◽  
Toxicity Screening ◽  
Trickling Filter ◽  
Home Life ◽  
Wastewater Samples

Toxicity screening tests using the Reserve Electron Transfer (RET) and Electron Transfer (ETr) assays were performed with five wastewater samples amended with trickling filter (TF) or activated sludge (AS) biomass. In the case of untreated samples, Home Life domestic wastewater (HLD/W) showed the lowest inhibition, followed by domestic sewage (DS), hospital wastewater (H/W), East Straus wastewater (ES/W), and Mills wastewater (M/W) from both ETr and RET assays. After 12 hours of treatment at 20°C, DS with AS biomass had the lowest % inhibition from the RET assay, followed by DS with TF, HLD/W with TF, H/W with TF, M/W with TF, and M/W with AS. AS biomass reduced more toxicity from DS than TF biomass whereas acclimated TF biomass reduced significantly more toxicity than AS biomass, indicating the importance of acclimation. M/W was most toxic and resistant to biodegradation among six wastewater samples. No nitrification occurred with M/W and ES/W. While there was significant nitrification with DS treated by AS biomass, little nitrification by TF biomass occurred even with DS, HLD/W, and H/W. It appears that nitrification is significantly inhibited by M/W and ES/W even when mixed with domestic sewage. It appears that there is a strong relationship between the TIC/TC ratio and % inhibition.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

Sign in / Sign up

Export Citation Format

Share Document