Combined treatment process for non-biodegradable organic wastewater

Abstract

The invention discloses a combined treatment process for non-biodegradable organic wastewater. The combined treatment process includes: removing suspended substances in water via a coagulation precipitation process; performing efficient muddy water separation via a coarse filtering process; subjecting the wastewater to treatment on the basis of combined action of electrochemistry, oxidation-reduction, physical absorption and flocculent precipitation by the aid of the iron-copper and iron-carbon galvanic cell principle, degrading organic pollutants and improving biodegradability of the wastewater; finally degrading organics into carbon dioxide and water via the anaerobic-aerobic biochemical reaction process; further filtering the suspended substances via the fine filtration process to enable the produced water to reach the wastewater discharge standard. Double electrolytic reaction is applied, so that organics removal effect is higher, biodegradability of the wastewater is further improved, and the combined treatment process has the advantages of being good in treatment effect, low in operation cost, convenient to operate and maintain and the like.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a combined treatment process for refractory organic waste water. Background technique [0002] Refractory organic wastewater mainly refers to printing and dyeing wastewater, coking wastewater, pharmaceutical wastewater, etc. It is characterized by high concentration of organic pollutants, large chroma, high salinity, and contains harmful substances such as heavy metals and polycyclic aromatic hydrocarbons, and its biodegradability is poor. Generally, the pH of printing and dyeing wastewater is 6-13, the chroma is as high as 1000 times, and the COD is 400-4000mg / L. If biochemical or other individual technologies are used to treat such sewage, not only will the economic cost be high, but it will also be difficult to achieve a good treatment effect. [0003] According to the treatment technology research and engineering practice of refractory organic wastewater, the following prob...

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Problems solved by technology

If biochemical or other individual technologies are used to treat this kind of sewage, it will not only cost a lot of money, but also it is difficult to achieve a good treatment effect.

[0003] According to the treatment technology research and engineering practice of refractory organic wastewater, the following problems can be found: (1) The efficiency of conventional methods for treating wastewater is not high, some toxic compounds are difficult to remove, and the effluent cannot really meet the discharge standards; (2) ) Some special processes or equipment have a large investment, and the cost of wastewater treatment is high, so it is difficult to popularize and apply; (3) The system is relatively complex, with high requirements for operation and operation, and the stability needs to be improved

[0005] Traditionally, the micro-electrolysis materials used in the micro-electrolysis process are generally iron filings and charcoal, which need to be activated with acid and alkali before use. During the use, it is easy to passivate and harden, and because iron and charcoal are in physical contact, it is easy to form a bond between them. The isolation layer makes micro-electrolysis unable to continue and loses its function, which leads to frequent replacement of micro-electrolysis materials, which not only has a large workload and high cost, but also affects the treatment effect and efficiency of wastewater

In addition, the small surface area of ​​traditional micro-electrolysis materials also makes wastewater treatment take a long time, increasing the investment cost per ton of water, which seriously affects the utilization and promotion of micro-electrolysis processes

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