Experimental Study Of High Concentration Organic Wastewater Reclamation By Using MBR

For the austere situation of lack of water resource and severity of water pollution currently, the trend of water reuses is necessity for the economy development. The wastewater treatment plant still troubled by bio-foam, include the Membrane Bioreactor (MBR). This thesis will focus on the reuse of high concentration organic wastewater and control of bio-foam; have studied the landfill leachate and dairy wastewater treatment and control of bio-foam with MBR as core treatment technology.In the treatment of landfill leachate with MBR-RO, which sludge loading were 0.35 kg COD_cr·kg^-1SS·d^-1, sludge concentration were 8～ 10g/L and retention time were 30d, the removal efficiency of COD_cr and ammonia nitrogen exceeded 92% and 81% respectively, the effluent can meet the national standard for wastewater discharge (GB 8978-1996), and comes up recycling water standard for greenbelt. In the experiment, the sludge yield coefficient(Y) was 0.41 kg VSS ? kg^-1COD_cr, the sludge microbial oxygenation ratio (K_d) were 0.13d^-1and three approach of metal ion transfer and transform were obtain.The experiment research in the treatment of dairy wastewater adopt hydrolyzeacidification-MBR and MBR, which F/M were 0.45kgCOD_cr·kg-1SS·d-1, MLSS were 8g/L and SRT were 35d, the removal efficiency of ammonia nitrogen and COD_cr over 85% , the effluent can meet the recycling water standard for wastewater discharge (CJ.25.1-89),and Y was 0.44 kg VSS ? kg^-1COD_cr,K_d, were 0.14d^-1. The conclusions are drawn through the contrast tests that the hydrolyzeacidification-MBR which energy consumption were 0.48 times of MBR was confirmed optimal technology. The nitrification and denitrification exist in MBR, the result show that the removal rate of ammonia nitrogen and total nitrogen were highest when DO were 1.5mg/L and 1.8mg/L respectively in hydrolyzeacidification-MBR and MBR.The theory of bio-foam forming can be explained by generalized Monod model through analysis of bio-foam influence factor and forming reason, and make a conclusion that the organosilicon defoaming reagent is most suitable for control of bio-foam in MBR.