糖精钠生产废水的综合处理技术

STUDY ON COMPREHENSIVE TREATMENT TECHNOLOGY OF SACCHARIN SODIUM PRODUCED WASTEWATER

针对糖精钠废水的特点 ,本研究从物化法与生化法两种途径进行了系统的预处理研究。物化预处理中 ,采用铁氧体法 ,可使铜去除率≥ 98% ,CODCr去除率≥ 40 % ,色度去除率≥ 80 % ;混凝法可去除 CODCr≥ 60 % ,色度去除率 80 %左右 ;Fenton试剂氧化可使 BOD5/CODCr由原水的 0 .1 5提高到 0 .5 ,同时去除 CODCr40 %左右 ,色度 80 %以上。生化预处理采用厌氧膨胀床工艺 ,当进水CODCr浓度 <35 0 0 mg/L时 ,CODCr去除率≥ 80 % ,当进水 CODCr浓度 >35 0 0 mg/L时 ,BOD5/CODCr比值由进水的 0 .2提高到 0 .3以上。依据上述研究 ,经过适当的工艺组合 ,可使废水处理后达到排放标准 。

Saccharin Sodium Wastewater is typical strong concentration industrial organic wastewater. Its organic ingredients are authranilate, phthalandione, ortho-chlorotolu'ene, xylenol etc. It contains heavy metals, such as CU 2+ , Fe 2+ , Fe 3+ , Cd 2+ and so on. COD Cr concentration is 35000mg/L. The value of BOD 5/COD Cr is about 0.15. So it is difficult to biogradate. pH value is how at 1.0 and colour is above 400 times. In view of the characterstics of this wastewater, physico-chemical processes and biochemical treatment were abopted in preliminary treatment. The removal rate of copper ion, COD Cr and colour were above 98%, 40%, 80% respectively after Ferrite Method Treatment. The removal rate of COD Cr and colour were above 60% and 80% respectively after coagulation treatment. In Fenton Agent oxidation, the value of BOD 5/COD Cr was raised from 0.15 to 0.5. Simultaneously the removal rate of COD Cr and colour were 40% and 80% respectively. Anaerobic Expanded Bed Process was adopted in biochemical treatment. When influent COD Cr concentration was low at 3500mg/L, the removal rate of COD Cr was above 80%. When that was above 3500mg/L, the value of BOD 5/COD Cr was raised from 0.2 tp 0.3. On the basis of this research, effluent reached discharge standard after suitable process had been combined. Practical treatment engineering design and operation of this wastewater were provided basis.