Analysis of the use of polyaluminium chloride to remove sulfur generated by the oxidation process Analysis of the use of polyaluminum chloride to remove the sulfur generated oxidation Process Electrochemical oxidation of sulfur ions as elemental sulfur, if not properly handled, occurs during discharge or injection process Pipeline plugging, pipeline corrosion, scaling, but also speed up microbial propagation, efflux will cause great pollution to the environment, so remove the elemental sulfur in aqueous solution is very necessary, the choice of PAC in this experiment as a flocculant. The effect of the amount of flocculant on the flocculation effect Take the simulated sewage after electrolysis as the experimental water sample, the turbidity value of which is 345 NTU and the pH value is 7.52. Divide the water sample into 5 parts according to the flocculation test method, add 0.2 parts of polyaluminum chloride , 0.5,0.8,1.1,1.4g / L, room temperature (20 positive and negative 2) degree of turbidity and pH value measured, when the amount of PAC addition is very small, the turbidity value and pH increase with the addition of Decrease, when the added amount of 0.8g / L, then increase the amount of PAC, the turbidity value increases with the amount of PAC increased, the reason may be as the amount of polyaluminum chloride increased, the formation of Of the alum is getting smaller and smaller, sinking slower and slower, and even floating phenomenon; pH is increased due to the larger alkalinity of polyaluminum chloride, adding excess aluminum chloride will make water samples Elevated pH, thus affecting the sulfur elemental settling flocculation effect. When adding polyaluminum chloride mass concentration of 0.8g / L, the turbidity minimum, at this time pH 7.03, close to neutral, the best precipitation. The effect of stirring intensity and mixing time on the flocculation effect During the flocculation process of water treatment, it is generally divided into six stages of hydrolysis-coordination-polymerization-gelation-precipitation-crystallization. The input of PAC together with the concentration of elemental sulfur Interaction, the various states of aluminum adsorption on the surface of the particles in the electric neutralization and bonding bridging effect, so that the fine particles can be gathered easily separated from the water. Agitation strength and time are two very important factors in wastewater flocculation treatment. Stirring is generally divided into two stages: the first stage contains the physical mixing of the flocculant and the initial aggregation process of the extrusive colloid. According to the experimental conditions, the stirring intensity and time at this stage are defined as the stirring speed of 300 r / min and the stirring time of 1 min ; Stage 2 is the stage of experiment selection. When the stirring rate is 100r / min and the stirring time is 4min, the turbidity value is the smallest, and the flocculation effect is the best. S2- has strong corrosiveness to the pipeline, and with the increase of S2- content, the corrosion rate increases, and the local severe corrosion occurred in the experiment. The phenomenon may be related to the autocatalysis of Cl-. Therefore, it is very necessary to remove S2 from the wastewater, and the development of wastewater treatment and anti-corrosion technologies will bring significant benefits to the development of the oilfield. Stirring rate and time have a great impact on the flocculant use effect, flocculation process to select the appropriate mixing rate and time is very important. In this experiment, the use of PAC as flocculant method has the advantages of short flocculation time, low cost, good safety, little impact on the pH of the effluent, good treatment effect and relatively mature technology. Experiments show that the use of PAC can achieve the desired effect .