Chinese medicine extraction wastewater treatment - new technology for pharmaceutical wastewater treatment technology

New process for pharmaceutical wastewater treatment

Iron carbon filler + IC anaerobic reactor: wastewater treatment in pharmaceutical plants

Pharmaceutical industry wastewater mainly includes four categories: antibiotic production wastewater, synthetic drug production wastewater, Chinese patent medicine production wastewater, and washing water and washing wastewater in various preparation processes. The wastewater is characterized by complex composition, high organic content, high toxicity, deep chroma and high salt content, especially poor biochemical properties, and intermittent discharge, which is an industrial wastewater that is difficult to treat. With the development of China's pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important sources of pollution. How to treat this type of wastewater is a difficult problem in environmental protection today. The iron-carbon micro-electrolysis + high-efficiency anaerobic IC treatment unit technology independently developed by Jinan Guangbo Environmental Protection Technology Co., Ltd. has become an important method for treating pharmaceutical wastewater.

Principle of wastewater treatment by micro-electrolytic filler

General principle: Iron-carbon microelectrolysis is based on the galvanic cell reaction in electrochemistry. When iron and carbon are immersed in the electrolyte solution, since there is a 1.2V electrode potential difference between Fe and C, a myriad of microbattery systems are formed, forming an electric field in the working space. The new ecological divalent iron ions produced by the anodic reaction have strong reducing ability, can reduce certain organic substances, and can also make certain unsaturated groups (such as carboxyl-COOH, azo-N=N-) The key is opened to decompose part of the refractory cyclic and long-chain organic matter into biodegradable small molecular organic substances to improve biodegradability. In addition, divalent and trivalent iron ions are good flocculants, especially the new divalent iron ions have higher adsorption-flocculation activity, and adjusting the pH of the wastewater can make the iron ions become flocculent precipitates of hydroxides. Adsorption of suspended or colloidal fine particles and organic polymers in the sewage can further reduce the chromaticity of the wastewater, and at the same time remove some organic pollutants to purify the wastewater. The cathodic reaction produces a large number of new ecological [H] and [O]. Under acidic conditions, these active components can undergo redox reactions with many components in the wastewater, causing the organic macromolecules to undergo chain-breaking degradation, thereby eliminating The color of organic wastewater improves the biodegradability of wastewater. The pre-treated wastewater then enters the high-efficiency anaerobic GBIC processing unit independently developed by Jinan Guangbo Environmental Protection Technology Co., Ltd., which has a good effluent effect and lays a good foundation for deepening the aerobic stage.

Pharmaceutical wastewater treatment technology:

The pharmaceutical wastewater treatment technology can be summarized into the following: physical and chemical treatment, chemical treatment, biochemical treatment and combination treatment of various methods, and various treatment methods have their own advantages and disadvantages. Most of the pharmaceutical wastewater has the characteristics of high organic matter concentration, high chroma, refractory and toxic to microorganisms, complex water quality and poor biodegradability. With the development of China's pharmaceutical industry, pharmaceutical wastewater has gradually become one of the important sources of pollution. How to treat this type of wastewater is a difficult problem in environmental protection today.

First, materialized treatment

According to the water quality characteristics of pharmaceutical wastewater, physicochemical treatment is required as a pretreatment or post-treatment process for biochemical treatment. The currently applied physical and chemical treatment methods mainly include coagulation, air flotation, adsorption, ammonia stripping, electrolysis, ion exchange and membrane separation. Pharmaceutical wastewater treatment technology 1. Air floatation air flotation method usually includes various forms such as inflatable air floatation, dissolved air flotation, chemical air floatation and electrolysis air floatation. The pharmaceutical wastewater was pretreated by CAF vortex air flotation device. The average removal rate of COD was about 25% with the appropriate agent.

Pharmaceutical wastewater treatment technology 2. Coagulation method This technology is a water treatment method commonly used at home and abroad. It is widely used in the pretreatment and post-treatment of pharmaceutical wastewater, such as aluminum sulfate and polyferric sulfate for traditional Chinese medicine. Waste water, etc. The key to efficient coagulation treatment is to properly select and add coagulants with excellent performance. In recent years, the development direction of coagulants has evolved from low molecular to polymeric polymers, from a single functional component to a composite. Liu Minghua and others used a high-efficiency composite flocculant F-1 to treat the wastewater of acute syrup production. When the pH was 6.5 and the flocculant dosage was 300mg/L, the COD, SS and chromaticity removal rates of the waste liquid were respectively It has 69.7%, 96.4% and 87.5%, and its performance is obviously better than single flocculant such as PAC (powdered activated carbon) and polyacrylamide (PAM).


Pharmaceutical wastewater treatment technology 3, membrane separation membrane technology includes reverse osmosis, nanofiltration membrane and fiber membrane, which can recover useful substances and reduce the total amount of organic emissions. The main features of this technology are simple equipment, easy operation, no phase change and chemical change, high processing efficiency and energy saving. Juanna and others used a nanofiltration membrane to separate the cinnamycin wastewater. It was found that both the inhibitory effect of lincomycin on the microorganisms in the wastewater was reduced, and the cinnamycin was recovered.


Pharmaceutical wastewater treatment technology 4. Adsorbents commonly used in adsorption methods include activated carbon, activated coal, humic acid, and adsorption resins. Wuhan Jianmin Pharmaceutical Factory uses coal ash adsorption-two-stage aerobic biological treatment process to treat its wastewater. The results showed that the COD removal rate of the wastewater by adsorption pretreatment was 41.1%, and the BOD5/COD value was increased. Pharmaceutical wastewater treatment technology 5, electrolysis method This method has the advantages of high efficiency and easy operation, and has received great attention. At the same time, the electrolysis method has a good decolorization effect. The iron-carbon electrolysis + high-efficiency anaerobic GBIC treatment unit independently developed by Jinan Guangbo Environmental Protection Technology Co., Ltd. has good effluent effect. The riboflavin supernatant was pretreated by electrolysis, and the removal rates of COD, SS and chromaticity were 71%, respectively. 83% and 67%.

Second, chemical treatment

When chemical methods are applied, the excessive use of certain reagents may easily lead to secondary pollution of water bodies. Therefore, relevant experimental research work should be done before design. Chemical methods include iron-carbon method, chemical redox method (fenton reagent, H2O2, O3), deep oxidation technology, and the like. Pharmaceutical wastewater treatment technology 1. The industrial operation of iron-carbon method shows that the biodegradability of effluent can be greatly improved by using Fe-C as a pretreatment step of pharmaceutical wastewater. Treatment of pharmaceutical intermediates such as erythromycin and ciprofloxacin with iron-carbon-micro-electrolysis-anaerobic-aerobic-air-floating combined treatment. The COD removal rate after treatment with iron and carbon method is 20%. The effluent meets the first-class standard of the National Integrated Wastewater Discharge Standard (GB8978-1996).

Pharmaceutical wastewater treatment technology 2, Fenton reagent treatment method The combination of ferrous salt and H2O2 is called Fenton reagent, which can effectively remove the refractory organic matter that cannot be removed by traditional wastewater treatment technology. With the deepening of the research, ultraviolet light (UV), oxalate (C2O42-) and the like are introduced into the Fenton reagent, so that the oxidation capacity is greatly enhanced. Cheng Hao et al. used TiO2 as a catalyst and a 9W low-pressure mercury lamp as the light source. The Fenton reagent was used to treat the pharmaceutical wastewater, and the decolorization rate was 100%, the COD removal rate was 92.3%, and the nitrobenzene compound was lowered from 8.05 mg/L. To 0.41 mg / L. Pharmaceutical wastewater treatment technology 3. Oxidation method can improve the biodegradability of wastewater and have a good removal rate of COD. For example, Balcioglu and other three antibiotic wastewaters were subjected to ozone oxidation treatment. The results showed that the ozone oxidation wastewater not only increased the ratio of BOD5/COD, but also the COD removal rate was above 75%.

Third, biochemical treatment

Biochemical treatment technology is a widely used treatment technology for pharmaceutical wastewater, including aerobic biological method, anaerobic biological method, aerobic-anaerobic combination method.



Pharmaceutical wastewater treatment technology 1. Aerobic biological treatment Because pharmaceutical wastewater is mostly high-concentration organic wastewater, it is generally necessary to dilute the raw liquid when performing aerobic biological treatment, so the power consumption is large, and the wastewater is biodegradable, and it is difficult to directly biochemically. After treatment, the standard discharge is achieved, so there is not much aerobic treatment alone, and pretreatment is generally required. Commonly used aerobic biological treatment methods include activated sludge method, deep well aeration method, adsorption biodegradation method (AB method), contact oxidation method, sequencing batch intermittent activated sludge method (SBR method), and circulating activated sludge method. (CASS law) and so on.

Pharmaceutical wastewater treatment technology 2. Deep well aeration method Deep well aeration is a high-speed activated sludge system. This method has high oxygen utilization rate, small floor space, good treatment effect, low investment, low operating cost, and no sludge. The advantages of expansion and low mud production. In addition, its heat preservation effect is good, and the treatment is not affected by climatic conditions, which can ensure the effect of winter wastewater treatment in the northern region. After the high-concentration organic wastewater from the Northeast Pharmaceutical Plant was biochemically treated in the deep well aeration tank, the COD removal rate reached 92.7%. It can be seen that the treatment efficiency is very high, and it is extremely beneficial to the next step of treatment. Play a decisive role.

Pharmaceutical wastewater treatment technology 3, AB method AB method is an ultra-high load activated sludge method. The removal rate of BOD5, COD, SS, phosphorus and ammonia nitrogen by AB process is generally higher than that of conventional activated sludge process. Its outstanding advantages are high load in section A, strong impact load resistance, and large buffering effect on pH and toxic substances. It is especially suitable for treating sewage with high concentration and large changes in water quality and quantity. The hydrolytic acidification-AB biological process is used to treat antibiotic wastewater, the process is short, energy saving, and the treatment cost is lower than the chemical flocculation-biological treatment method of the same kind of wastewater.

Pharmaceutical Wastewater Treatment Technology 4. Biological Contact Oxidation Method This technology combines the advantages of activated sludge and biofilm method. It has the advantages of high volumetric load, low sludge production, strong impact resistance, stable process operation and convenient management. Many projects use a two-stage method, which aims to acclimate the dominant strains at different stages, give full play to the synergy between different microbial populations, and improve biochemical effects and impact resistance. In the engineering, anaerobic digestion and acidification are often used as pretreatment steps, and the contact oxidation process is used to treat pharmaceutical wastewater. The hydrolytic acidification-two-stage biological contact oxidation process was used to treat pharmaceutical wastewater. The operation results show that the treatment effect is stable and the process combination is reasonable. With the gradual maturity of the process technology, the application field is also more extensive. Pharmaceutical wastewater treatment technology 5, SBR method SBR method has strong impact load resistance, high sludge activity, simple structure, no reflow, flexible operation, less land occupation, low investment, stable operation, high matrix removal rate, nitrogen and phosphorus removal effect Good advantages, suitable for treating wastewater with large fluctuations in water quality. The SBR process for treating pharmaceutical wastewater shows that the aeration time has a great influence on the treatment effect of the process; setting the anoxic section, especially the repeated design of anoxic and aerobic, can significantly improve the treatment effect; PAC's SBR intensive treatment process can significantly improve the removal efficiency of the system. In recent years, the process has become more and more perfect, and it has been widely used in the treatment of pharmaceutical wastewater. Qiu Lijun and others used the hydrolysis acidification-SBR method to treat biopharmaceutical wastewater, and the effluent quality reached the first grade standard of GB8978-1996.