Aerobic biological fluidized bed technology treatment of sulfur and high ammonia-nitrogen waste water in a petroleum refinery.

Alistair Borthwick, Zhengfang Ye, Lili Wen, Jinren Ni

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Wastewaters from petrochemical p lants are of two types: high sulphur wastewater with high levels of sulfur, oil, chemical oxygen demand ( COD ) and
phenol; and high ammonia2nitrogen wastewater emanating from catalyst workshop s, which contains large concentrations of ammonia2nitrogen, salinity, suspended solids (SS) and lower organic pollutants. Conventional biological treatments are expensive and not very effective at handling both kinds of wastewater stream. In this paper, a new aerobic biological fluidized bed technology (ABFT) process is proposed, whereby a mixture of the two kinds of wastewater is treated. A pilot experiment has been conducted to examine the feasibility of treating the mixed wastewater stream. In the experiment, the initial mean concentrations of contaminants in the mixed wastewater are: COD = 2090mg·L - 1 , NH+ 4 2N = 600mg·L - 1 , volatile phenol = 27mg·L- 1 ,
and sulfide = 154mg ·L- 1 1 After treatment by the ABFT process, the mean
concentrations are as follows: COD = 95mg·L- 1 , NH+2N = 410mg·L - 1 , volatile phenol 0130mg·L - 1 and sulfide 010067mg·L - 1 1 The results meet the demands of China’s National First2grade Standard for Integrated Wastewater Discharge. In the ABFT p rocess, methods of dynamic oxidation, mixing and sedimentation are app lied to wastewater p retreatment, with the use of immobilized microorganisms on a patented synthesized polymer carrier p roviding the core technology. The carrier emp loyed as fluidized media in the ABFT reactor has a porous reticular structure, and it exhibits excellent mechanical strength and chemical characteristics. Highly efficient B350 microorganisms have been selected that can be immobilized on the carrier by chemical bonds. The Kjeldahl2Gunning test for nitrogen determination indicates that the mean average immobilized biomass on the carrier is 32g ·L- 1 ( H2O ). Experimental investigations show that the proposed ABFT process has overwhelming advantages over the conventional sequencing biological reactor (SBR) process, particularly with regard to treatment of high ammonia2nitrogen wastewater. Meanwhile, the treatment efficiency and the resistance capacity against sudden changes in loading are both significantly increased.

Original languageEnglish
Pages (from-to)345-357
Number of pages13
JournalJournal of Basic Science and Engineering
Volume13
Issue number4
Publication statusPublished - 2005

Keywords / Materials (for Non-textual outputs)

  • aerobic biological fluidized bed technology ( ABFT ) ; immobilized microorganisms; sulfur2containing wastewater; high ammonia2nitrogen wastewater; dynamic oxidation

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