Combined biological treatment method for pharmaceutical and chemical sewage and organic waste gas

Abstract

The invention discloses a combined biological treatment method for pharmaceutical and chemical sewage and organic waste gas. The method comprises the steps that waste gas is in countercurrent contactwith a mud-water mixture from an aerobic tank in virtue of a biological spray tower, so soluble organic matters in the waste gas are adsorbed; then the waste gas is subjected to Fenton treatment and aFenton reagent reaction, so degradation-resistant organic matters in the waste gas are oxidized and degraded; then the waste gas passes through a spray washing tower and is washed with clear water from a clear water tank; residual organic matters are removed from the washed waste gas through a biological filter, and then the waste gas is discharged through a chimney; after wastewater is treated by a Fenton reaction tank, an anoxic tank, an aerobic tank and a sedimentation tank, upper-layer clear water reaching a standard in the sedimentation tank enters the clear water tank; and washing liquid of a Fenton treatment tower is discharged into the Fenton reaction tank. The method integrates advanced oxidation, anaerobic and aerobic biological purification, a biological filter treatment process and other processes, and has the characteristics of high combined wastewater and waste gas treatment efficiency, low Fenton reagent consumption, low operating cost and the like.

Description

technical field [0001] The invention relates to a method for treating waste water and waste gas, in particular to a comprehensive treatment method for pharmaceutical and chemical waste water and waste gas. Background technique [0002] Pharmaceutical and chemical wastewater has the characteristics of strong odor, refractory degradation, and high concentration of pollutants. In the process of wastewater treatment, it is often necessary to pretreat the wastewater to destroy the structure of organic matter, reduce the molecular weight of organic matter, reduce the toxicity of organic matter, and improve the biodegradability of waste water. Finally, COD, ammonia nitrogen, total nitrogen and other pollutants are removed through anaerobic-aerobic. The pharmaceutical and chemical waste gas is mainly composed of VOCs produced in the chemical synthesis section, extraction / extraction section, raw material storage section and sewage treatment section of the pharmaceutical production pr...

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Problems solved by technology

[0006] Among the above mainstream VOCs treatment processes, the low-temperature plasma technology is immature and has poor safety, and has been stopped by some local authorities; the activated carbon adsorption method is difficult to regenerate activated carbon, and after the adsorption is saturated, it will be treated as hazardous waste, and the operating cost is extremely high. As a result, the equipment and facilities cannot be operated normally; the photocatalytic oxidation method has a low service life of the catalyst, a short service life of the ultraviolet lamp, and will be affected by dust in the exhaust gas. The treatment efficiency is low, most of the equipment cannot operate normally, and there is a risk of deflagration; Although the combustion method has high treatment efficiency, it has high requirements for daily maintenance. There are many cases of casualties caused by improper maintenance every year, and the combustion chamber explodes; Its safety stands out among several mainstream treatment processes and has become the main choice for more and more pharmaceutical and chemical companies to control VOCs

[0007] However, the traditional biological deodorization process has its own shortcomings: 1. In order to ensure the normal growth of microorganisms, it is necessary to provide nutrient solution for microorganisms, which increases operating costs

2. For refractory organic substances such as benzene series, halogenated hydrocarbons, aromatic compounds and insoluble or insoluble organic substances, the effect of biological deodorization treatment is limited, and in the case of high concentrations, the discharge cannot be guaranteed to meet the standards

3. The microbial community is unstable, and it may degenerate after long-term operation

4. The discharge of eluent is large, resulting in excess waste water

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