臭氧高级氧化协同下的造纸废水深度处理小试研究

采用"臭氧高级氧化+固定化微生物反应器"工艺对造纸废水进行深度处理小型试验,处理能力为2.4m3/d。结果表明,在系统进水COD为280～350mg/L的情况下,出水COD在50 mg/L以下,最低为42 mg/L,去除率保持在80%以上,最高达85%,色度去除率为70%～80%。出水COD满足GB 3544—2008《制浆造纸工业水污染物排放标准》要求。

On a improved treatment of papermaking sewage cooperated with ozone advanced oxidation

The paper aims to introduce a renovated treatment method of papermaking sewage coordinated with ozone advanced oxidation.The pilot experiment designated for treating the papermaking sewage is to apply an "ozone pre-oxidation+ immobilized microbial reactor" with a capacity of 2.4 m3/d. The said experiment consists of two stages.At the first stage,sewage can be directly led into an immobilized bioreactor without ozone pre-oxidation while,in the second stage,the effluent from the first stage can be conducted into an ozone reactor and let to stay there for 3.5 hours,and consequently led to the immobilized bioreactor.The results of the first stage experiment indicate that when COD in the influent remains below or equal to 250 mg/L,proving the system well-working and highly stable in manipulation.The system is working at a high-load state when COD in influent.Meanwhile,COD in the effluent tends to be lower than 200 mg/L and the maximal removing rate can reach 81%.The results of the second experiment stage prove that when the COD in the influent reaches 280350 mg/L,the COD in the effluent can be lower than 50 mg/L with the lowest degree being 42 mg/L.If the COD removing rate can be kept at a rate of about 80% with the highest removing rate reaching 85%,it would be possible to make the chroma removing rate up to 70%-80%.Comparing the above two stages,we can surely predict that the preprocessing of strong oxidation with ozone will be able to help us to create a favourable condition for later biochemical reactions and in turn to promote the operation efficiency of biochemical reactor with the stable effluent quality.So the whole system is expected to maintain a high fluctuation impact resistanlogce and high removing efficiency.In so doing,the integration of ozone advanced oxidation technology and biotechnology is expected to improve the advanced treatment efficiency of papermaking sewage and decrease the energy consumption with single usage of ozone technology.Therefore,it would be possible for the COD in the effluent can not only be made to meet the "special water pollutanlogts emission limit value" of the Pulp and Paper Industry Discharge Stanlogdard(GB 3544—2008),but also promote the sewage-removing rate up to the advanced level at least for the current domestic technological state insitus.