Treatment process for treating organic sewage by using ionizing radiation in cooperation with catalyst

Abstract

The invention discloses a treatment process for treating organic sewage by ionizing radiation cooperating with a catalyst, and relates to the field of water treatment. The organic sewage treatment process comprises the steps of rough filtration unit treatment, A / O biochemical treatment, ionizing radiation and synergistic catalyst treatment, biochemical advanced treatment, final physical separation and up-to-standard discharge of supernate. The ionizing radiation and synergistic catalyst comprises two parts: (A) carrying out ionizing radiation on the organic sewage; (B) contacting the organic sewage with a catalyst; wherein the step (A) and the step (B) are carried out at the same time or are carried out in sequence after interval time, and the interval time is less than or equal to 3 minutes. The catalyst comprises a specific metal element and an optional carrier, and the specific metal element is selected from at least one of magnesium, aluminum and transition metal and exists in an insoluble solid form. The process disclosed by the invention has the advantages that the cost is low, the organic pollutants can be efficiently degraded to reach the first-grade A standard environment-friendly emission standard, the economical efficiency is good, and the risk of newly adding hazardous wastes and salinity is avoided.

Description

technical field [0001] The invention relates to sewage treatment, in particular to a treatment process for treating organic sewage with ionizing radiation co-catalysts. Background technique [0002] There are high-concentration and refractory high-molecular organic substances in the sewage and landfill leachate of chemical industry parks. At present, the membrane filtration method commonly used in the industry separates the pollutants in the sewage through membranes. After membrane separation, 40% to 60% of the clear water is discharged up to the standard, while the concentrated water formed by the enrichment of the remaining pollutants is difficult to obtain effective treatment and discharge. For example, landfill leachate membrane treatment process: biochemical + ultrafiltration + nanofiltration + reverse osmosis (RO) treatment process is adopted, which requires large investment, high treatment cost and low treatment efficiency. In particular, the concentrated water produ...

AI Technical Summary

Problems solved by technology

At present, the membrane filtration method commonly used in the industry separates the pollutants in the sewage through membranes. After the membrane separation, 40% to 60% of the clear water is discharged up to the standard, and the concentrated water formed by the enrichment of the remaining pollutants is difficult to obtain effective treatment and discharge.

For example, landfill leachate membrane treatment process: using biochemical + ultrafiltration + nanofiltration + reverse osmosis (RO) treatment process, large investment, high treatment cost, and low treatment efficiency

In particular, the concentrated water produced in the sewage membrane treatment process is usually recharged to the landfill for secondary adsorption, and then used as landfill leachate to repeat the above-mentioned process; The loss of secondary adsorption capacity leads to higher and higher concentration of landfill leachate, making the treatment more and more difficult

However, the ultra-high influent concentration leads to frequent backwashing operations of the membrane system, reduces the service life of the membrane treatment system, gradually reduces the output of clean water, and continuously increases the operation and maintenance costs.

[0003] On the other hand, the traditional processes represented by Fenton, ozone catalytic oxidation and biochemical treatment have significant technical bottlenecks: 1. It is difficult for most long-chain polluting organic substances to achieve the degradation target through sewage biochemical process; 2. Long-chain organic pollutants It cannot be used as nutrients for microorganisms in the biochemical process of sewage, and a large amount of carbon source needs to be added to maintain the operation of the biochemical system; 3. Single-stage Fenton and ozone catalytic oxidation have low efficiency in treating most long-chain polluting organics. To achieve the treatment goal, it is necessary to build Multi-level treatment units lead to problems such as lengthy process, high treatment cost, complicated operation, and poor stability in the sewage treatment process; 4. The treatment process of Fenton and ozone catalytic oxidation requires the addition of a large amount of chemicals, which generates a large amount of hazardous waste during the treatment process Sludge, while increasing the treatment cost, also increases the risk of environmental hazards; 5. Fenton and ozone catalytic oxidation processes use a large number of dissolved oxidants, etc., which increase the salinity and other toxic and harmful components in the sewage, resulting in the process unit only It can be used as the terminal treatment unit, and the tail water discharge has obvious ecological damage to the receiving water body, and it is difficult to meet the discharge standard in the discharge environment with salinity requirements

[0004] In short, one of the main problems facing the field of sewage treatment is: when dealing with polymer compounds, there are difficulties such as difficult degradation, high cost, complicated procedures, and secondary pollution caused by the treatment process.

[0005] Degradation by ionizing radiation is a technology with great potential, but currently there are few technical applications of ionizing radiation sewage treatment in industry, and the additives added in the ionizing radiation process are all consumable reagents, including hydrogen peroxide, hypochlorite Acids and thiosulfates, etc., wherein the method of ionizing radiation combined with multi-metal catalysts for the degradation of high-molecular organic pollutants has not yet been seen.

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