The hot chemical washing method of the sludge treatment method is a preferred method for the US Environmental Protection Agency to treat oily sludge, and is mainly used for the treatment of oily sludge containing large sediment particles. Generally, it is repeatedly washed with a hot alkali aqueous solution, and then solid-liquid separation is achieved by air flotation. The washing temperature is controlled at about 70 °C, the liquid-solid ratio is 2:1, and the washing time is 20 min. The oil content is 30%, and the residual oil rate is less than 1%. The mixed base can be composed of inexpensive inorganic bases and inorganic salts. The method has low energy consumption and low cost, and is an oily sludge treatment method which is currently studied in China and is generally used.
The chemical hot-washing multi-stage separation process is used to treat the oil sludge on the oil field. The temperature of the water is washed, the time, the solid-liquid ratio, the single value of the pH value and the orthogonal experimental analysis to determine the hot wash temperature between 60-80 ° C. The mass ratio to water is 1:5~1:7, the hot wash time is 30min, and the PH value is between 9 and 11. Through the drug screening experiment, it is considered that DL-100 has a better demulsification effect on suspended sludge, and the sodium silicate alkali solution has a good cleaning effect on the tank bottom mud. Under the optimum process conditions, the oil removal rate of the ground sludge was measured to be 96%.
Thermochemical cleaning of oily sludge is a complex dynamic multiphase flow process. Process parameters and chemical agents are two major and difficult points. The screening of cleaning chemicals involves factors such as material migration and separation.
The chemical agents in the sludge cleaning process were studied. Under the optimal process conditions, eleven chemical agents were selected for drug screening and compounding experiments. The results showed that the anionic surfactants AEO-9, NP-10 and dispersant sodium silicate had better cleaning effect, and the residual oil rate after washing was below 2%. The above three agents were also subjected to a compounding experiment to determine the formula of the best cleaning agent: 13 (AEO-9): 1 (NP-10): 6 (Na2SiO3); 21 (AEO-9): 3 (NP- 10): 6 (Na2SiO3), the above two formulations can reduce the residual oil residue rate to less than 4%, and the sodium silicate in the mixed agent has a great influence on the cleaning effect of the agent.
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