Treatment Of High Salt Wastewater By Microbial Augmentation Method

High salinity wastewater is one of the difficulties in the field of wastewater treatment,especially the high chlorine wastewater. Generally, biochemical treatment effect will begreatly reduced when the chlorine content reached5000~8000mg/L. High salinity notonly affect the microbial survival because of the high osmotic pressure but also has sometoxicity to microorganisms. As a new technology in the field of wastewater treatment,immobilized microorganism technique has many advantages. This paper had studied anew type of immobilized materials and its treatment effect for saline organic simulationwastewater. Variation of microbial communities was also studied. MNPs were also usedto treat the saline organic simulation wastewater.The results showed that GO was favourable for the growth and reproduction ofhalotolerant bacteria. The mechanical strength of GO/La(OH)3, GO/SA was poor. Boricacid cross-linked polyvinyl alcohol (PVA) showed high apparent viscosity. The GO/PVAprepared by freezing method showed high mechanical strength and small apparentviscosity, which made it appropriate microbial carrier to embed halotolerant bacteria.PLFAs were used to analyze changes in microbial biomass and microbial communitystructure. It showed that bacteria was far more than fungi, aerobic bacteria was far morethan anaerobic bacteria, gram-negative bacterium was far more than gram-positivebacterium.Acinetobacter, Pseudomonas, Thermohydrogenium, Arthrobacter existed in allthe four samples of different salinity. Pseudomonas and Acinetobacter wererelatively high with the content of44%and9%.In this paper, GO/PVA was used as microbial carrier. When applied in treatmentof glucose simulation wastewater of low concentration, the removal rate of CODCrandNH3-N could reach80%and90%with the concentration of Cl-were3000,5000,7000mg/L, respectively. When applied in treatment of glucose simulation wastewater ofhigh concentration, the removal rate of CODCrcould reach62.85%,44.24%,37.85%, respectively with the salinity were3%,4%,5%. When applied in treatment of CMCsimulation wastewater of high concentration, the removal rate of CODCrcould reach56.61%and36.95%respectively with the salinity were3%,4%, while removal rate ofNH3-N could reach40.48%and33.38%. Treatment effect of GO/PVA microbial carrierwas better than PVA microbial carrier.The sluge mixed with MNPs had better effect than the blank treating thesimulation wastewater. The MLSS growed fast and the supernate showed highertransparence. Besides, MNPs could recycle the free halotolerant bacteria efficiently.