Document Details

Document Type : Thesis 
Document Title :
Study on recycling of Chromium from tanning wastewater "Case Study"
دراسة عن تدوير الكروم من مخلفات الدباغة السائلة "دراسة حالة"
 
Subject : Faculty of Meteorology, Environment and Arid Land Agriculture > Department of Environmental Sciences 
Document Language : Arabic 
Abstract : Tannery waste contains high concentrations of chromium salts. Chromium is a harmful heavy element, which can cause a lot of damage when discharged in an unsafe manner. The aim of the present study is to study the possibility of applying one of the treatment methods that depend on precipitation and extraction to recycle chrome from tanning wastewater in one of the leather tanning factories in Jeddah. It was found from the results of analysis of grab samples collected from the tanning wastewater collection basin the exceedings of the concentrations of pH (3.2 to 2.3), Cr (7574-9256 mg/l) and Chemical Oxygen Demand (COD) (1106-1741 mg/l) the allowable limits for direct discharge or in to the central treatment facilities mentioned in the executive regulations of the general environmental law in the KSA. It was also found that the Total Dissolved Solids (TDS) results (51,657 to 78,341 mg/l) exceeded the allowable limits for discharge in to the central treatment utilities. The results of sedimentation experiment using three chemical precipitators, Sodium Hydroxide, Calcium Oxide and Magnesium Oxide, showed that the removal of Total Suspended Solids (TSS), COD, and Cr increase with increasing pH for the three precipitators where the removal percentage was the minimum at pH 7 and the maximum at pH 9. It was found that the removal percentages of TSS, COD, and Cr with Magnesium Oxide precipitant at all pH levels were higher than those with the other precipitators. In spite of the little difference in the Cr removal percentages of all the precipitators, the remaining Cr concentrations in the fluid after precipitation were the lowest in case of Magnesium Oxide (1.084 mg/l) followed by Calcium Oxide (1.973 mg/l), and finally with Sodium Hydroxide (2.23 mg/l). The TDS for all the treated samples by the three prec. 
Supervisor : prof.dr.Muhammed Hassan Ramadan 
Thesis Type : Master Thesis 
Publishing Year : 1437 AH
2016 AD 
Added Date : Wednesday, March 2, 2016 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
حسين عبد الله عسيريAsseri, Hussain Abdullah SulimanResearcherMaster 

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