丝绸厂汰头废水除磷试验研究
Experimental study on phosphorus removal of silk factory cocoon wastewater
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摘要: 针对丝绸厂汰头废水高有机物浓度高氮磷的特点，对该废水的化学除磷工艺及生物化学组合除磷工艺的除磷效能进行了对比研究，考察了有机负荷、运行工况、工艺组合、药剂种类和投加量等对除磷效能的影响。试验结果表明：对汰头废水采用厌氧-生物除磷-生物脱氮-化学除磷组合工艺除磷经济高效，当生物除磷SBBR工艺单元有机负荷为3 kg BOD5/m3·d， 运行工况为进水0.5 h厌氧2 h-曝气4 h-沉淀1 h-排水0.5 h，化学除磷工艺单元投加60 mg/L聚合氯化铝（PAC）时，可使COD及PO3-4分别为10 000 mg/L和114 mg/L的进水，出水COD及PO3-4分别为93 mg/L和0.23 mg/L；总ηCOD为91.5%，ηPO3-4为99.8%。其中生物除磷工艺单元承担的ηPO3-4为75%；化学除磷工艺单元承担的ηPO3-4为24.8%。Abstract: For the characteristics of silk factory cocoon wastewater of high organics, nitrogen and phosphorus concentrations, the efficiency of chemical and biochemical phosphorus removal technology was compared by inspecting the influences of organic loading, operating mode, technical combination, chemicals and dosing, etc. Experimental results showed that the anaerobic-bio-phosphorus removal-bio-denitrification-chemical phosphorus removal combination process applied in cocoon wastewater treatment was economic and highly efficient. When organic load rate (OLR) was 3 kg COD/m3·d in the bio-phosphorus removal-SBBR unit, operating mode was influent 0.5 h-anaerobic 2 h-aerobic 4 h-deposit 1 h-effluent 0.5 h, and 133 mg/L poly-aluminum chloride was added in chemical phosphorus removal unit. As a result, the COD concentration had been degraded from 10 000 mg/L to 93 mg/L and the PO3-4 concentration from 114 mg/L to 0.23 mg/L, the total ηCOD was 91.5%,ηPO3-4 was 99.8%. For phosphate removal, the ηPO3-4 of bio-phosphorus removal unit and chemical-phosphorus removal unit was 75% and 24.8% respectively.
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