Oily wastewater mainly refers to pollutants generated by petrochemical enterprises during the excavation process. If the oily sludge is not properly handled and directly discharged, it will not only directly affect the soil and groundwater resources, but also be a huge waste of our already scarce oil resources. First of all, when treating oilfield wastewater, oil removal must be carried out first, and then other treatments are carried out. The oil removal process is inclined tube oil removal (light oil floats up, scrapers are scraped off, heavy oil sinks, and pipelines are discharged), and the flotation machine removes emulsified oil. The flotation machine has a good effect on removing emulsified oil, but the demulsification experiment should be carried out on the oil in the water, and then polyaluminum chloride and other agents should be selected.
Polyaluminum chloride is an inorganic polymer coagulant, which is an inorganic polymer water treatment agent with a large molecular weight and a high charge produced by the bridging effect of hydroxide ions and the polymerization effect of multivalent anions. Because the oilfield wastewater treatment process is relatively complicated, at present, a specific polyaluminum chloride water treatment agent plus polyacrylamide is generally used in China for deep treatment, and the sulfide ions in the oilfield wastewater are oxidized to sulfur element by electrochemical methods, and then polyaluminum chloride is used as a flocculant for desulfurization. Henan New Huan Polyaluminium Chloride technical personnel studied the effects of flocculant dosage, mixing intensity and mixing time on the desulfurization effect of flocculants. The results showed that when the mass concentration of polyaluminium chloride was 0.8g/L, the mixing speed was 100r/min, and the mixing time was 4min, the flocculation effect was the best, the effluent turbidity value was the smallest, and the pH was close to neutral. Oilfield wastewater mainly includes crude oil dewatering water (also known as oilfield produced water), drilling wastewater and other types of oily wastewater polyaluminium chloride in the station. There are many ways to treat oilfield wastewater according to oilfield production, environment and other factors.
Detailed treatment method of polyaluminium chloride for oilfield wastewater:
Add polyaluminium chloride (solid) and normal temperature water at a ratio of 1:3 while stirring until completely dissolved, and then add water to dilute to the required concentration. When the raw water is turbid 100-500mg/L, the dosage is 3-6mg/L. When adding in detail, a small test should be carried out according to the water quality conditions, and the best dosage should be selected and then put into use.
When polyaluminium chloride is flocculated with oilfield sewage, there are many flocculated substances floating on the surface of the pool. These substances need to be removed by other methods, such as scraping away with a scraper or a special net bag. Sometimes there is still oil floating, which means that the dosage is not enough or it is not fully mixed with sewage.
The additives added in the process of crude oil mining and refining often have anionic surfactants, which can change the surface tension of water in oil and facilitate the removal of water from oil. In the process of oil processing, these additives are partially discharged as wastewater with water and residual oil. Because these additives remain in the wastewater, its surface tension is different from that of other water, and the residual oil and other pollutants exist in the wastewater in the form of emulsions. Due to the change in surface tension, the oil and some other impurities in the wastewater are not actually in direct contact with water molecules, and it is difficult for the emulsions to polymerize with each other to form suspended matter. Therefore, general physical and chemical coagulants are difficult to work or work very poorly.
Henan Xinhuan Polyaluminium Chloride Manufacturer is specialized in high-tech environmental protection technology for water pollution management and resource utilization. Our company's main business scope includes sewage, sludge and wastewater treatment. We have achieved many scientific research results and proprietary technologies, and have successfully applied them to environmental pollution management projects in various fields.
The main products of flocculant manufacturer Xinhuan Water Treatment are:
White polyaluminium chloride (food grade), drinking grade polyaluminium chloride, industrial grade polyaluminium chloride, anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polyferric aluminium chloride and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：+8619003830067 Email：joanna@xhwtm.com Contact:Joanna
