Novel oilfield sewage disposal coagulant

Abstract

The invention provides a novel oil field sewage disposal coagulant and relates to the oil field sewage disposal agent. The weight percentage of the coagulant is as follows: 10 to 20 percent of aluminum sulphate, 2 to 10 percent of zinc sulphate, 0.2 to 0.5 percent of PDMDAAC and the rest is water. The coagulant is used for purifying sewage containing hydrogen sulfide and oil, and high-temperature thick-oil sewage. The preparation method is comprises the following steps: 10 to 20 percent of aluminum sulphate and 2 to 10 percent of zinc sulphate are added into water and after the aluminum sulphate and zinc sulphate are completely dissolved, the 0.2 to 0.5 percent of PDMDAAC is added, and then the mixed solution is stirred evenly to adjust the pH value to 3 to 4 to so as to obtain the coagulant. With the same purified water quantity, the oil and suspended matter in the purified water are reduced dramatically with the coagulant, and the formed flocs is thicker and the settlement speed is quicker, and the impact on the purified water quality by the water quantity fluctuation can be reduced to a certain extent.

Description

technical field

[0001] The invention relates to an oilfield sewage treatment agent, in particular to a novel oilfield sewage treatment coagulant. Background technique

[0002] Compared with urban domestic sewage, oilfield sewage has higher requirements on the performance of water purification agents due to the complexity of its components.

[0003] CN200410021527.9 discloses a sulfuric acid type composite water purifying agent for sewage purification treatment, the formula is: 30-50% of aluminum sulfate, 35-65% of magnesium sulfate, and 15-35% of zinc sulfate.

[0004] CN200310110619 discloses a coagulant for swimming pools, which is composed of aluminum sulfate, polyferric sulfate, ferrous sulfate, polyacrylamide and the like.

[0005] Although the hydrolysis reaction of traditional aluminum and iron salt flocculants is extremely fast, when used to treat oilfield sewage with emulsification, the water purification effect is not ideal, and the long-term stability of water qu...

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