Alkaline residue processing method

Abstract

The invention provides an alkali dreg treatment method which includes the following steps: first, an alkali pretreatment system; second, a biological treatment system; and Third, a waste gas biological treatment system. Through the biological degradation, the organism in the waste gasis decomposed so as to eliminate the odor in the waste gas. The invention has the advantage that the highly efficient biological treatment process adopted by the comprehensive alkali treatment of the method has the characteristics of a little investment, low energy consumption, cheap treatment, safe and reliable performance, convenient operation and management, no pollution, friendliness to the environment, etc. The application of the method greatly reduces the attack to the sewage treatment field during the alkali dreg treatment and reduces the possible great amount of entrustment cost. On the one hand, the invention prevents the pollution of the alkali dreg to the environment, thereby protecting the environment, on the other hand, the invention makes full use of the potential value of the alkali dreg, thereby creating a new mode of benefit making through the circular economy. The invention conforms to the clean development of the enterprise, protects the natural environment and achieves the saving and sustainable development.

Description

technical field [0001] The invention relates to a method for treating alkali slag. Background technique [0002] In the process of petroleum refining and processing, alkali washing process is usually used to remove sulfide in oil products. In the process of alkali washing, various alkali residue wastewater containing high concentration of sulfide and refractory organic matter will be produced. Its COD, The emissions of sulfides and phenols are as high as 40%-50% of the total pollutant emissions of refineries. With the increasing requirements of the whole society for environmental protection and strict control requirements for the migration and flow of pollutants, how to economically and effectively complete the harmless treatment of various alkali residues has become one of the environmental protection problems to be solved by various refining and chemical enterprises. [0003] Various alkali slags have different pollutant types and concentrations due to different sources, ...

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Problems solved by technology

[0005] Practice has proved that the above methods have their own disadvantages: 1) The high temperature and high pressure wet oxidation process usually has a low treatment capacity of only 1-2t / h, and the one-time investment and operation costs are huge. According to the treatment fee of 350 yuan per ton, Dagang Petrochemical Company 2 The amount of alkali slag is 10,000 tons / year, and the treatment cost alone is close to 7 million

Moreover, the method of completely oxidizing and removing all organic matter is not suitable for the recovery and utilization of naphthenic acid and phenol in diesel soda residue and catalytic gasoline soda residue.

2) Compared with the high temperature and high pressure wet oxidation process, the moderate wet oxidation + SBR process does not affect the recovery and utilization of naphthenic acid and phenol in diesel soda residue and catalytic gasoline soda residue, but the one-time investment and operating costs are higher , according to 250 yuan / ton processing fee, this alone is as high as 5 million / year

At the same time, due to the reduction of the severity of the moderate wet oxidation operation, only a high removal rate of sulfide is retained, and the oxidation removal rate of COD is only 20-30%. Even after passing through SBR, COD may still be as high as 5000-30000, increasing the Treatment load and potential for shocks to subsequent oily wastewater treatment systems

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