determining the salt tolerance threshold for biological treatment of salty wastewater
نویسندگان
چکیده
background wastewaters with high salt content disturb the metabolic function of microorganisms causing plasmolysis or activity loss in microorganisms, so the efficiency of biological treatment of saline wastewater by conventional microorganisms will decrease. objectives this study aimed to find the outbreak of disorder in the biological wastewater treatment process and how much salt leads to low efficiency in the wastewater treatment plant. conclusions for wastewater with high tds content, modification such as dilution, collection system sanitation, application of halophytic organisms, the use of non-biological methods and so on is recommended. results removal efficiency of qualitative parameter including bod, cod, tss and turbidity showed a reduction of about 79.7, 73.9, 67.6 and 66%, respectively by addition of 8 gr/l of nacl to wastewater. by increasing tds by more than 4000 mg/l, biological treatment was done at a low efficiency and was disturbed with tds of about 8000 mg/l, with efficiency of the treatment system strongly decreasing. methods a study unit consisting of two aeration and sedimentation parts was used in this pilot research. initially, 2 to 10 gr of nacl was added to wastewater (ww) then aerated and settled for six and two hours, respectively. during a 10-weeks period, 10 samples were obtained and, the parameters of biological oxygen demand in 5 (bod5), chemical oxygen demand (cod), total suspended solids (tss), ph, turbidity, total dissolved solids (tds) and mixed liquor suspended solids (mlss), were measured. all experiments were done according to standard methods.
منابع مشابه
Thermophilic Biological Wastewater Treatment
Thermophilic treatment is one of the advanced treatment technologies used for the purification of high-strength wastewaters. Thermophilic systems are conventionally used for sludge treatment, but their ability to reduce COD to a great extent with sludge generation one-tenth when compared to the other wastewater treatment technologies, have favored its application for wastewater purification. Mo...
متن کاملGenomics of biological wastewater treatment
Cleaning up wastewater from domestic sewage and industrial processes is essential for safeguarding public health and the environment (for an overview of wastewater treatment processes see http://en.wikipedia.org/wiki/ Sewage_treatment). Biological wastewater treatment plants (WWTPs) employing sludge represent one of the most widely used biotechnological processes, with more than 120 billion lit...
متن کاملEvaluation and Determination of the Salt Tolerance Threshold of Some Fenugreek (Trigonella foenum-graecum) Ecotypes at Seedling emergence Stage
Extended Abstract Introduction: Fenugreek, is a medicinal plant that has been considered as a salt tolerant crop. This research was conducted to investigate the effects of salt stress on seedling emergence characteristics and determination of the salt tolerance threshold, declivity of emergence and salt tolerance index of some fenugreek ecotypes. Material and Methods: Seeds of five ...
متن کاملA review on the electrochemical treatment of the salty organic wastewater
Electrochemical technologies have proved to be useful for the treatment of wastewater, and recent years, there are growing interests in electrochemical treatment of the salty organic wastewater. The aim of this paper is to mainly present the source of the salty organic wastewater, the mechanism of direct and indirect oxidation process, and the research advances of electrochemical technologies i...
متن کاملBiological treatment of tannery wastewater by using salt-tolerant bacterial strains
BACKGROUND High salinity (1-10% w/v) of tannery wastewater makes it difficult to be treated by conventional biological treatment. Salt tolerant microbes can adapt to these saline conditions and degrade the organics in saline wastewater. RESULTS Four salt tolerant bacterial strains isolated from marine and tannery saline wastewater samples were identified as Pseudomonas aeruginosa, Bacillus fl...
متن کاملمنابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
health scopeجلد ۶، شماره ۱، صفحات ۰-۰
کلمات کلیدی
میزبانی شده توسط پلتفرم ابری doprax.com
copyright © 2015-2023