List of Articles کیفیت پساب

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Investigation of the Quality and Pollution Level of Waste Water Obtained from Recycling of MDF Wastes
  bita moeizi Mohamad Ahmadi Aida Moezzipour Ali Abdolkhani
  10.22034/jest.2020.30522.3893
  Background and Objectives: The cellulose industry is one of the most important and influential industries in developed and developing countries. Waste recycling is one of the activities that have recently been considered in this industry. Despite the enormous economic a More

  Background and Objectives: The cellulose industry is one of the most important and influential industries in developed and developing countries. Waste recycling is one of the activities that have recently been considered in this industry. Despite the enormous economic and environmental benefits of recycling, this process results in the generation of effluent which is important for the study of its pollution. Method: For recycling of MDF wastes two different method including hydrothermal and ohmic heating were utilized. Hydrothermal method was done at 105˚C for 150 min and ohmic heating method was carried at 100 ˚C for 2 different time duration (2 and 4 min).The chemicals contained in waste waters obtained from recycling of MDF wastes were determined using of chromatography and mass spectroscopy (GC/MS) test.  Additionally, pH value, BOD, COD, TDS and TSS for all kinds of waste waters were measured. Finding: The results showed that the nitrogenous compounds had the most concentration in waste water obtained from hydrothermal method, and in the wastewater produced by ohmic method, both the 2 and 4 mins. Discussion and Conclusion: The most active materials were the acids. The obtained waste waters included chloride phenol compounds, tannins and lignin derivatives and their BOD, COD and suspended compounds were higher than the requirements defined in standard. Filtration method can be used for decreasing the amount of suspended solids.     Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - Evaluation of Performance and Quality of Effluent in Birjand Wastewater Treatment Plant for Agricultural Purposes
  Mohammad Hosein Fathabadi Mohammad Hosein Ahmadi Shadmehri Seyed Masoud Faiz Sayyid Ali Banihashemi
  Basis and Goal: Today, the most basic action to control pollution from wastewater and their reuse is the construction of a wastewater treatment plant and strict monitoring of their operation. Disposal of non-standard effluents and their use in agriculture or surface wat More

  Basis and Goal: Today, the most basic action to control pollution from wastewater and their reuse is the construction of a wastewater treatment plant and strict monitoring of their operation. Disposal of non-standard effluents and their use in agriculture or surface water discharge will lead to many health and environmental risks. Therefore, the present study was conducted with the aim of auditing the environmental performance and quality of Birjand wastewater treatment plant for agricultural use. Method of Studing: This study was conducted in 1399 using a cross-sectional study method from 1396 to 1398 on the wastewater treatment plant of Birjand. Finding: The findings showed that the COD index with an average of 225 had the highest non-compliance with the standard in 1396. TSS index with an average of 153 is in the second place, total coliform with an average of 1300 in the third place and gastrointestinal coliform with an average of 502.5 are in the fourth place. In 1398, these indicators are in a standard and optimal condition. Results: Comparison of the results of the current study with the effluent standards showed that the use of the effluent of this treatment plant for agricultural purposes is recommended due to compliance with the effluent standards. This trend has shown a favorable situation during the years 1396 to 1398. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  3 - Investigation of Sewage Treatment Conditions in Guilan Province Hospitals
  Abdolreza Karimi Zahra Rahimi Rashtabadi
  Hospital wastewater contains a variety of pollutants, a large amount of pathogenic microorganisms, viruses, radioactive materials, etc., which unless treated and disposed properly, can cause serious damage to human beings and the environment. The purposes of this study More

  Hospital wastewater contains a variety of pollutants, a large amount of pathogenic microorganisms, viruses, radioactive materials, etc., which unless treated and disposed properly, can cause serious damage to human beings and the environment. The purposes of this study are to investigate the wastewater treatment and disposal conditions and the effluent quality in Guilan hospitals.In this study, besides the investigation of wastewater management conditions in Guilan hospitals with wastewater treatment plants, the sewage treatment performance was assessed in one of the hospitals. Qualitative indicators including total coliform, fecal coliform, pH, DO, BOD5, COD, TSS, total phosphate, ammonia, nitrate and silver in the effluent were assessed and the lab results were compared to the standards of Iran Department of Environment.According to statistical results, 10 out of the 34 studied Guilan hospitals have active wastewater treatment systems. Furthermore, the qualitative assessment showed that pH, COD, BOD5, DO, phosphate, nitrate, silver, total coliform and fecal coliform levels in the hospital conform to the standards of Iran Department of Environment. However, reduction of ammonia and TSS levels should be considered. A number of hospitals in Guilan do not have wastewater treatment plant and their wastewater is discharged into municipal wastewater collection systems or drains. On the other hand, a number of hospitals with wastewater treatment plants do not work properly. Therefore, it is important to consider executive decisions regarding new wastewater treatment technologies and upgrading treatment process in existing wastewater treatment plants. Keywords: Hospital Wastewater, Effluent Quality, Wastewater Treatment, Ammonia Manuscript profile