Treatment of Synthetic Olefin Plant Wastewater at Various Salt Concentrations in a Membrane Bioreactor

Abstract

The objective of this study was to investigate the effect of salt concentration on performance of a membrane bioreactor (MBR) for treating an olefin plant wastewater. For this purpose, a lab‐scale submerged MBR with a flat‐sheet ultrafiltration membrane was used for treatment of synthetic wastewater according to oxidation and neutralization unit of olefin plant. The synthetic wastewater was adjusted to have 500 mg/L chemical oxygen demand (COD). Trials on different concentrations of sodium sulfate (Na2SO4) (0–20 000 ppm) in the feed were conducted under aerobic conditions in the MBR. The results showed that increasing the salt concentrations causes an increase in the effluent COD, phenol, and oil concentrations. These results are due to reduction of the membrane filtration efficiency and also decline in the microbial activity that it is indicated by decreasing the sOUR in MBR. But in all the trials, the effluent COD and oil concentration was well within the local discharge limit of 100 and 10 mg/L, respectively. These results indicate that the MBR system is highly efficient for treating the olefin plant wastewater, and although high salt concentrations decreased organic contaminant removal rates in the MBR, the effluent still met the discharge limits for treating the olefin plant wastewater.

Analysis of Key Technologies for Industrialized Treatment of Fatty Acid High-Salinity Organic Wastewater

“…[45][46][47] Thus, the load and treatment efficiency of the reactor are Due to the unique structure, the IC reactor also has excellent performance under high load. 50) IC reactors can often handle At present, the research hotspots of high-efficiency anaerobic reaction process of high-salt organic wastewater mainly include high-efficiency reactors [53][54][55][56][57][58][59][60][61][62][63][64][65] , bio-enhancement [66][67][68][69][70][71][72][73] , etc.…”

Επίλυση Προβλήματος Σε Θέματα Ρύπανσης Των Υδάτων Και Λειψυδρίας

“…Η ποσότητα του κοκ που παράγεται καίγεται για επανενεργοποίηση του καταλύτη και αύξηση της θερμότητάς του (Μπόλλας, 2006: 30-42• Ψαρράς, 2009). Τα απόβλητα από τη διύλιση του πετρελαίου είναι από αυτά με την υψηλότερη αλατότητα και περιεκτικότητα σε οργανικό υλικό, συγκρινόμενα με την παραγωγή πυρηνικής ενέργειας και τις χημικές βιομηχανίες (Lefebvre & Molleta, 2006• Rasheed et al, 2011, γεγονός που επηρεάζει την απόδοση στα συστήματα απορρύπανσης που χρησιμοποιούνται (Sadeghi et al, 2012). Σε αυτά εντοπίζονται αλειφατικοί, αλεικυκλικοί και αρωματικοί υδρογονάνθρακες.…”