Research On Integrated Treatment Technology Of Penicillin Wastewater

Penicillin wastewater is a pharmaceutical industry wastewater which contains various pollutants with high concentrations. It places a lot of pressure on environmental protectors. Amounts of sulfate and ammonia result in a decline in the reduction of the COD, so many new techniques for desulphurization and denitrification have appeared. This cannot easily be achieved with the current techniques of desulfurization and denitrification alone. It is difficult to be treated by traditional biotreatment technology because of its refractory and high concentration of sulfate salt and ammonia, so a highly effective treatment technology of this wastewater is becoming the focus of a hot domain in this environmental field. In this paper, in order to achieve effective pollution removal from penicillin wastewater a pilot scale and land scale of simultaneous desulphurization and denitrification techniques were established and studied on the basis of quality analysis for wastewater biodegradability. The results are the following:(1) The results of the wastewater quality analysis indicated that the COD concentration and sulfate salt concentration of penicillin wastewater were about 30000mg/L and 5000-7000mg/L, respectively. Although high concentration of BOD5 and suspended solids were found these are more easily reduced than the COD and sulfate. The concentration of sulfate salt and the demulsifiers were the important factor for the COD removal.(2) The pilot scale of simultaneous desulfurization and denitrification technique was carried out in a UASB reactor. The results showed that the pretreatment is good at improving the biodegradability of the penicillin wastewater and the optimized conditions for the experiment were the SO₄^2-load of 4.5kg/m³Â·d, C/S of 3.5:1, the S/N ratio of 5:3. In this condition, the COD removal was up to 95%.(3) The results in the land scale for the simultaneous desulfurization and denitrification technique showed that the pretreatment - simultaneous desulfurization and denitrification—aerobic process has perfect effect in the removal of organic pollutants. During the operation over 90 days, the amount of influent increased from 0 to 500m³. The COD concentration of influent and effluent, removal for this system were 10000mg/L, less than 300mg/L, up to 93%, respectively. The ammonia concentration of influent and effluent, removal were 200mg/L, less than 10mg/L, up to 95%, respectively. The sulfate concentration of influent and effluent, removal were 6000mg/L, less than 400mg/L, up to 90%, respectively. The result gave a reference for engineering practice.