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Full scale two-stage activated sludge process (ASP) with fixed biological media was used to treat coal gasification wastewater. The ASP has operated for more than one year and COD, total phenol and NH4-N removal effects were illuminated. COD and total phenol removal rates were around 85% and 90% during long term operation. Effluent COD and total phenol of the first stage of the ASP had an abnormal...
This paper presented the operation results in the full-scale suspended carrier biofilm (SCB) process for the treatment of the low C/N ratio monosodium glutamate wastewater (MSGW). After the long-term operation of 185 days, the removal efficiencies of COD, total nitrogen (TN) and ammonia nitrogen (AN) achieved above 89.5%, 91% and 92.5% at the influent organic loading rate (OLR) of 1.25-1.8 kgCOD/(m...
In order to study phenoloxidase (PO) activity of the phenol-degrading bacteria, the carbon source of isolation culture medium adopts artificial phenol mixture. Stenotrophomonas maltophilia K279a is isolated from coal chemical industry wastewater. The optimum conditions for PO production are phenol 1000mg/L, temperature 30-34°C and PH 7-7.5. The strain resists 980mg/L COD and 805mg/L phenols. The degradation...
The treatment of coal chemical wastewater by the two-stage anaerobic process was studied in this paper. The results showed that the removal efficiency of chemical oxygen demand (COD), total phenols (TP), and volatile phenol (VP) could reach 53.9%, 52.6%, 84.9%, respectively, which was significantly better than the single-stage anaerobic unit. The division of each unit was different in the two-stage...
In order to get the predominant microorganism, the experiment adopted Sequencing Batch Reactor(SBR) method. The appropriate conditions for growth: COD400-1200mg/L, PH6-8, 30-45??C; the consecutive degradation results of 30d were measured in small-scale test: COD 85%, phenol mixture more than 98%,NH3-N35%-45%. To get this degradation level, the predominant microorganism used 2 4h, and the original...
Laboratory scale moving bed biofilm reactor (MBBR) was used to treat effluent from post-denitriflcation process in full-scale coal gasification wastewater treatment plant. Methanol was added into the effluent from post-denitriflcation to investigate the effect of surplus methanol on reactor performance. The average effluent COD, NH4-N and NO2-N concentrations were 145.14, 11.88 and 0.22 mg/L for blank...
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