A petrochemical plant rainwater drainage treatment method and its device and system

Abstract

The invention provides a petrochemical plant rainwater treatment method, device and system thereof. The electrocoagulation reaction device (2) includes a reaction tank (201), and a partition (202) is arranged inside the reaction tank, and the partition divides the reaction tank into a first reaction tank (2011) and a second reaction tank (2011) separated from each other along the flow direction of the water flow. The second reaction pool (2012), the top of the dividing plate is lower than the four walls of the reaction pool to form an overflow channel (203), the second reaction pool is connected with the pH control system (205) through a pipeline; the first reaction pool is provided with a water inlet (206 ), the second reaction tank is provided with a water outlet (207); the electrocoagulation reaction device also includes a first aeration device (204), and the first aeration device gas outlet is set at the bottom of the first reaction tank and the second reaction tank (2041). The invention can realize resource utilization of rainwater drainage and reduce sewage discharge. The invention can realize the advanced treatment and reuse of rainwater drainage, improve the sewage discharge reduction capacity of petrochemical enterprises, and the product water can reach the water quality index of circulating water cooling water replenishment.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular, the invention relates to a petrochemical plant rainwater treatment method and its device and system. Background technique [0002] The refining and chemical industry is a major player in water and sewage discharge. Most of my country's petrochemical enterprises are located in water-scarce areas and water-sensitive areas of river basins. The continuous improvement has also restricted the sustainable and healthy development of the petroleum and petrochemical industries, and the water recycling rate must be improved. In-depth promotion of water conservation and emission reduction work to achieve the goal of "zero emissions" is not only a reliable guarantee for the healthy development of refining and chemical enterprises, but also an important technical support for the harmonious development of the ecological environment and the economy. [0003] At present, chemical rainwater drainage ...

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Problems solved by technology

[0007] Conventional hardness removal techniques include: 1) Precipitation softening method: such as lime / soda softening method, lime / soda / phosphoric acid softening method, etc. The addition of a large amount of chemicals leads to high treatment costs and a large amount of sludge; 2) Biodegradation Urea carbonate precipitation method: can effectively reduce calcium ions, but the disadvantage is that the reaction generates NH 4 + The concentration is high, which increases the cost of subsequent treatment; 3) Biological precipitation technology: such as UASB has the advantages of short water retention time and large organic load, but the disadvantage is that when the calcium ion in the water is too high, it is easy to form excessive calcium carbonate precipitation in the device, which is easy to block. Inhibition of methanogenic activity, and the poor impact resistance of biological methods is also a problem; 4) Adsorption and ion exchange methods: the development of low-cost, renewable organic materials to adsorb and remove metal ions has become a research hotspot in the field of water treatment; yin and yang The combined use of ion exchange resin, using anion resin to remove COD and cation resin to remove hardness to replace coagulation and lime softening technology, solves the problem of sludge production, but the problem of resin pollution and regeneration efficiency still exists, and the level of process operation is direct. Affects maintenance and operating costs

[0008] Electrocoagulation technology is widely used in water treatment. During the reaction process, the active metal ions dissolved from the electrode plate form a hydroxide complex with strong adsorption capacity, and are mostly used for removing suspended solids and oil in sewage. , there is no report on the use of electrocoagulation technology in the reuse of chemical rainwater

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