scholarly journals Bioassay evaluation of toxicity reduction in common effluent treatment plant

2009 ◽  
Vol 1 (1) ◽  
pp. 8-12
Author(s):  
V. K. Tyagi ◽  
A. K. Chopra ◽  
N. C. Durgapal ◽  
A. A. Kazmi
Keyword(s):  
Settling Tank ◽  
Treatment Plant ◽  
Test Organism ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Tertiary Treatment ◽  
Treatment Unit ◽  
Entire Study ◽  
Effluent Treatment Plant ◽  
Domestic Effluent

This paper investigates the utility and validity of bioassay toxicity testing using Daphnia magna straus as test organism for monitoring the common effluent treatment plant (CETP) receiving both industrial as well as domestic effluent. The average daphnia toxicity (Gd) at inlet, after primary settling tank (PST), secondary settling tank (SST) and tertiary treatment unit were reported as Gd-16, Gd-12, Gd-4 and Gd-1 respectively. However, a cumulative percentage removal in toxicity after PST, SST and tertiary treatment units was observed as 25%, 75% and 100%, respectively, during entire study period. It showed that a complete removal in daphnia toxicity (Gd) i.e.100% had been achieved only after tertiary treatment unit involving Dual Media Filters followed by activated carbon filters. Further attempts have been made to establish the relationship between key wastewater constituents i.e. Chemical Oxygen Demand (COD) and Suspended Solids (SS) with respects to daphnia toxicity (Gd). It was observed that COD and SS show a statistically significant correlation (r2) with daphnia toxicity (Gd) i.e. 0.89 and 0.81, respectively. Thus COD and SS can serve as a regulatory tool in lieu of an explicit toxicity standard (to check and improve the operational status of wastewatertreatment plants in time).

scholarly journals Performance of slow sand filters in the after-treatment of effluent from Pernambuco state textile center

2020 ◽  
Vol 15 (6) ◽  
pp. 1
Author(s):  
Alanna Maria do Nascimento Bezerra ◽  
Marcos Henrique Gomes Ribeiro ◽  
Artur Paiva Coutinho ◽  
Ana Emília Carvalho de Gusmão da Cunha Rabelo ◽  
Elizabeth Amaral Pastich Gonçalves
Keyword(s):  
Organic Matter ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Organic Load ◽  
Sand Filters ◽  
Legal Limits ◽  
Effluent Treatment Plant ◽  
Experimental Apparatus ◽  
State Textile

Jean laundering generates significant effluent flows with a high organic load, color, and other pollutants, making it difficult to adjust effluent releases within legal limits. Slow Sand Filters (SSF) with downflow were tested for seven days (bench scale), to propose an after-treatment of effluents from an Effluent Treatment Plant of a jean laundry. The research evaluated the removal of the following parameters: color, turbidity, chemical and biochemical oxygen demand, conductivity, ammonia, total phosphorus and salinity of the textile effluent. The experimental apparatus had four SSF: the first filter was fed with distilled water, while the other three filters (triplicates) were fed with effluent. The filters had, on average, the following removal efficiencies: 91% for ammonia, 61.24% color, 89.43% turbidity, and 83.54% for phosphorus. Regarding the removal of organic matter, 98.11% for BOD and 81.17% for COD, demonstrating that SSFs were efficient in removing particulate, dissolved materials and organic matter.

scholarly journals Evaluation of the removal of total phosphorus from sanitary effluent by Chlorella vulgaris in a small batch photobioreactor

2018 ◽  
Vol 14 (6) ◽  
Author(s):  
Juliana Cabral Pereira ◽  
Amanda Isabelly Leite Figueiredo Nascimento ◽  
Yasmin Oliveira Carvalho ◽  
Cristina Ferraz Silva
Keyword(s):  
Chlorella Vulgaris ◽  
Environmental Sustainability ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Promising Alternative ◽  
Effluent Treatment Plant ◽  
The Government

The search of the scientific community for efficient and cheap technologies for the treatment of wastewater in Brazil continues being a challenge, mainly in the effort to encourage the government, responsible for the application and proliferation of these technologies. The release of contaminated effluent without treatment in the aquatic bodies leads to the degradation of these environments, what requires the reuse of these waters, facing environmental sustainability. In this context, microalgae establish a promising alternative, once the main attribute of algae culture in wastewater is its ability to efficiently assimilate organic carbon and inorganic nutrients from wastewater to achieve a clean effluent with efficient nutrient removal, besides a biomass production, accumulation of lipids, which can be converted into biodiesel. Assuming the important role of photosynthetic CO2 fixation, which helps to mitigate the alarming effects of the release of greenhouse gases into the atmosphere. The main objective of this work was to evaluate the capacity of the microalga Chlorela vulgaris in the removal of phosphorus from the sanitary sewage collected at the effluent treatment plant at Federal University of Sergipe using a small batch reactor. The results showed that the species Chlorella vulgaris were able to assimilate phosphorus and to remove organic matter (Chemical Oxygen Demand, COD) from the effluent. The results showed that photobioreactors using microalgae for the treatment of effluents is a promising technique and motivate additional studies, mainly due to their capability of adding value to the biomass generated during the treatment.

scholarly journals Performance Study of CETP (Common Effluent Treatment Plant)-ACase Study of Pandesara, Surat

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Anjali M. Tandel ◽  
Mitali A. Shah
Keyword(s):  
Coming Out ◽  
Industrial Development ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Effluent Treatment ◽  
Performance Study ◽  
Dissolved Solids ◽  
Treated Effluent ◽  
Effluent Treatment Plant

Water is life sustaining element subjected to pollution by human being in the name of industrial development. Global trends such as urbanization and industrialization have increased the demand for fresh water. The developing human societies are heavily dependent upon the availability of water with suitable quality and in adequate quantity for variety of uses. Rapid industrialization is adversely impacting the environment globally. Inappropriate management of industrial wastewater is one of the major environmental problems in India. Many small and medium scale industries cannot afford to have their own effluent treatment facilities which emphasizes on having a common effluent treatment plant to treat the heterogeneous effluent coming out of various sectors. Common Effluent Treatment Plants (CETP) for Textile industry is considered as one of the viable solution for small to medium enterprises for effective wastewater treatment. An effluent treatment plant operating on physical, chemical and biological treatment method with average waste water in flow of 100MLD has been considered for case study. The wastewater was analyzed for the major water quality parameters, such as pH, Chemical Oxygen Demand (COD), Total suspended solid (TSS) and Total Dissolved Solids (TDS). The COD of the treated effluent was reduced significantly, whereas very small reduction was observed in dissolved solids. Most of all the parameters were within the permissible limits of CETP, Pandesara Surat.

scholarly journals Performance Evaluation of Textile Effluent Treatment Plant: Bangladesh Perspective

2022 ◽  
Vol 7 (1) ◽  
pp. 25-34
Author(s):  
Md. Najmul Hasan ◽  
Samsul Islam ◽  
Mohammad Zoynal Abedin
Keyword(s):  
Removal Efficiency ◽  
Textile Industry ◽  
Ph Value ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Effluent Treatment ◽  
Discharge Water ◽  
Effluent Treatment Plant ◽  
Multiple Unit ◽  
Percentage Removal

The present study was undertaken to evaluate the performance efficiency of an Effluent Treatment Plant (ETP) of a Textile industry located at Tongi, Bangladesh with biological treatment (BT) and Membrane Bio-Reactor (MBR) with an average inflow of 300 m3/hr. The effluent samples were collected from the inlet and outlet of the ETP on a weekly basis for a 4 weeks’ period and were analysed for key parameters such as colour, temperature, total suspended solids (TSS), Total Dissolved Solids (TDS), pH, Dissolved Oxygen (DO), Biological Oxygen Demand (BOD), and Chemical Oxygen Demand (COD). In this study, it was observed that the colour of the effluent in the inlet was dark blue and after multiple unit treatments of the colour’s final outlet the discharge, water colour was very light purple. The temperature was varied from 32.2⁰C to 34.33⁰C. The TDS was varied from 1252.5 mg/l to 1087.5 mg/l and the percentage removal efficiency of TDS was varied from 21.47% to 42.7%. The TSS was varied from 4 mg/l to 4.5 mg/l and the percentage removal efficiency of TSS was varied from 98.48% to 98.21%. The pH value was varied from 6.48 to 7.63. The DO value in the inlet was varied from 6.47 mg/l to 6.775 mg/l. The BOD was recorded from 12.75 mg/l to 17.75 mg/l and the percentage removal efficiency of BOD was varied from 89.92% to 87.24%. The COD was varied from 33.75 mg/l to 34.25 mg/l and the percentage removal efficiency of COD was varied from 91.11% to 90.5%. It is conjectured that the values of the measured parameters are seen to be within the permissible limit as per the standard of the Department of Environment (DoE) of Bangladesh.

The Efficiency of a Biological Activated Sludge Effluent Treatment Plant with Extended Aeration

1988 ◽  
Vol 20 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Rurik Skogman ◽  
Reino Lammi
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Forest Products ◽  
Effluent Treatment ◽  
Chlorinated Phenols ◽  
Forest Products Industry ◽  
Effluent Treatment Plant ◽  
Closed Systems ◽  
Treating Effluent

The requirements imposed on the Finnish forest products industry by the water authorities have focused on the reduction of BOD and suspended solids in the wastewaters. The industry has tried to comply with these requirements, first through internal measures such as process changes and closed systems. When these have not been sufficient, external treatment has been resorted to. The Wilh. Schauman Company in Jakobstad has chosen activated sludge with extended aeration from among the available methods for treating effluent. The plant has operated since the beginning of 1986 with extremely good results. In addition to the reduction of BOD and suspended solids, there has been a marked decrease of chlorinated phenols. Chlorinated substances with higher molecular weight are also removed during the process.

Soft Drinks Industry Wastewater Treatment

1992 ◽  
Vol 25 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Larbi Tebai ◽  
Ioannis Hadjivassilis
Keyword(s):  
Biological Treatment ◽  
Industrial Effluent ◽  
Treatment Plant ◽  
Soft Drinks ◽  
Effluent Treatment ◽  
Production Lines ◽  
Effluent Treatment Plant ◽  
Industrial Effluent Treatment ◽  
Effluent Characteristics ◽  
Industry Wastewater

Soft drinks industry wastewater from various production lines is discharged into the Industrial Effluent Treatment Plant. The traditional coagulation/flocculation method as first step, followed by biological treatment as second step, has been adopted for treating the soft drinks industry wastewaters. The performance of the plant has been evaluated. It has been found that the effluent characteristics are in most cases in correspondence with the requested standards for discharging the effluent into the Nicosia central sewerage system.

LCA of a Representative Municipal Effluent Treatment Plant

2019 ◽  
pp. 235-248
Author(s):  
Saurabh N. Joglekar ◽  
Pratik D. Solankey ◽  
Sachin A. Mandavgane ◽  
Bhaskar D. Kulkarni
Keyword(s):  
Treatment Plant ◽  
Effluent Treatment ◽  
Municipal Effluent ◽  
Effluent Treatment Plant

scholarly journals Occupational inhalation injury by Hydrogen Sulfide causing multi organ failure –A case study

2019 ◽  
Vol 7 (2) ◽  
pp. 113-115 ◽  
Author(s):  
Karishma Shamarukh ◽  
- Mohammad Omar Faruq ◽  
Nasrin Jahan ◽  
Amina Sultana ◽  
Ridwan Naim Faruq
Keyword(s):  
Hydrogen Sulfide ◽  
Troponin I ◽  
Treatment Plant ◽  
Inhalation Injury ◽  
Effluent Treatment ◽  
Effluent Treatment Plant ◽  
Chest X Ray ◽  
Brain Ct Scan ◽  
Serious Injuries

Hydrogen sulfide is a notorious agent known to cause serious injuries in the occupational field. We are going to discussa case of a 20 years old male working in a effluent treatment plant in Savar, Bangladesh who accidentally entered thefume room and was exposed to the toxic gas. He lost consciousness and was brought to our care from a local hospitalafter endotracheal intubation condition. He was found in state of unconsciousness grade III on admission to our ICU.His brain CT scan revealed diffuse cerebral edema. Chest X-ray revealed finding suggestive of diffuse pneumonitis.Cardiology evaluation suggested Toxic cardiomyopathy as his high sensitive Troponin I was very high on admission (2037ng/L). Supportive care was given in the form of mechanical ventilation, antibiotics, anticonvulsant andanti-ischemic medications. Patient regained consciousness on day 10 after admission and gradually improvedclinically. By the end of the month of stay in hospital he was significantly improved. Bangladesh Crit Care J September 2019; 7(2): 113-115

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