处理后的难降解废水可以达到《污水综合排放标准》（GB18918-2002）一级B标准，即：COD≤60mg/L，BOD5≤20mg/L，SS≤20mg/L，NH3-N≤15，色度≤30，PH=6~9。

对难降解废水采用合理工艺，进行综合处理，减少了其对于环境的危害，并且将废水处理再生运用，有利于人类的长足发展，同时响应国家的可持续发展号召，符合我国国情现状。

关键词： 调节池；UASB; A/O；MBR；

Treatment process design of refractory organic wastewater

Abstract：Since pharmaceutical wastewater is a category of wastewater that is difficult to degrade in wastewater treatment, the relevant indicators for pharmaceutical wastewater are used. Perhaps because of its industrial specificity, the organic content of wastewater is high, the toxicity is large, the color depth is also high, and the salinity is high. , The biochemical characteristics are relatively low [1]. The characteristics of hard-to-degrade organic wastewater are complex water quality, including polycyclic aromatic compounds, phenols, benzenes, and heterocyclic compounds containing nitrogen, oxygen, and sulfur, oil, and ammonia and other toxic and hazardous substances.

Without carrying out multiple processes on these refractory wastewaters in advance, when it is discharged into underground waterways or rivers and lakes, it will cause unimaginable damage to the biological environment. Therefore, designing a rational and economical treatment process flow is an imminent event. .

This paper mainly designs waste water treatment plants and adopts the "Comprehensive Emission Standard for Wastewater" (GB8978-2002) as the discharge standard. The completed enterprise tutor teacher gave me a lot of help in selecting reference indicators. In the end, I referred to the case of treating wastewater from Jiangxi Pharmaceutical Wastewater Treatment Plant on the Internet, and took a relatively reasonable figure with reference to the pollutant index of the waste water it entered. According to the completion task book, the design of water inflow will be designed to discharge the refractory organic wastewater with a maximum water volume of 1000 m3 per day.

With the rapid development of industry and agriculture, people are synthesizing more and more organic materials, of which hard-degradable organics account for a large proportion. Therefore, research on the treatment of refractory organics has attracted the attention of experts at home and abroad. It is the current research on water pollution control. Hot spots and difficulties. Its high toxicity can cause the body to lack oxygen and even anaerobic, and even cause aquatic life to die, and deteriorate its surrounding water environment. There are many organic substances in organic waste water, which can be enriched in water bodies and soil environment, and eventually enter the human body and endanger human health. For this type of wastewater, there are many industrial wastewaters such as coking wastewater, pharmaceutical wastewater (including Chinese medicine wastewater), petrochemical/oil wastewater, textile/printing/dyeing wastewater, chemical wastewater, and paint wastewater.

The so-called "high concentration" means that the organic matter concentration of such wastewater (in terms of COD) is higher, generally above 2,000 mg/L, and some even up to tens of thousands to tens of thousands of milligrams; the so-called "difficult to degrade" means this The biodegradability of the wastewater is low (BOD5/COD values are generally below 0.3 or even lower) and it is difficult to biodegrade. Therefore, organic wastewater with a COD concentration of more than 2000 mg/L and a BOD5/COD value of less than 0.3 is generally referred to as refractory organic wastewater. "High concentration" and "difficult to degrade" make it difficult to effectively treat such waste water in a "conventional" method such as biological method or physicochemical method alone. Therefore, the combination of other methods such as biological methods and materialization methods is studied in an attempt to minimize the processing cost.