| In the petrochemical industry,the sludge in the sewage treatment plant is mainly composed of “ three kinds sludge”,that is,sludge,scum and residual activated sludge,in addition to a small amount of sludge tank bottom mud and grit chamber mud sand.In recent years,China’s oil consumption has increased year by year.According to statistics,the apparent consumption of oil in 2017 has reached 576 million tons.Every year,refining and chemical enterprises will produce a large amount of “ three kinds sludge” in the process of treating industrial wastewater generated by enterprises themselves.The characteristics of the " three kinds sludge" determine that it is difficult to deal with,even if it is costly,affecting the efficiency of the enterprise.As “Three kinds sludge” enters the national catalogue of dangerous chemicals,and the state is increasingly strict with the management of hazardous chemicals,“Three Mu” has become a difficult problem for refining and chemical enterprises,especially for old enterprises such as Jingmen Petrochemical.The problem of " three kinds sludge" is even related to the survival of enterprises.The Diesel spiral sludge dewatering machine(referred to as the stacking screw machine)has been applied to the municipal sewage treatment plant to treat biochemical sludge.Therefore,it is considered to use the stacking screw machine to deal withthe “ three kinds sludge” to solve the problem of the refining and chemical enterprises.The " three kinds sludge" of the stacking screw machine is mainly studied through two experiments:1.The first-phase experiment mainly studies the dewatering effect of the scum treated by the stacking screw machine,and whether it has a good dewatering effect.Studying the effect of the medicament on the treatment of the stacking machine,determining the use category of the medicament and the concentration of the medicament by experiment,and obtaining the analysis data of each product after the dewatering of the stacker;2.The ability of the stacker to treat sludge and residual activated sludge was verified by the second phase experiment.Understand the impact of different oil content in the raw materials on the stacking machine,product forming ability and various analytical data.Further drying with quicklime,study the calorific value of the product,and judge whether it can dry the "three kinds sludge" by coal burning combustion treatment.The experimental research shows that the effect of “ three kinds sludge” in the treatment of the stacking screw is better,and the purpose of reducing the water content and meeting the water inflow index of the sewage field is realized.After the " three kinds sludge" treated by the stacking screw machine is dried by the quicklime,the moisture content ofthe product is further decreased.The burned test was carried out on the dried three kinds sludge,and it was also verified that it had a higher combustion heat value.The dried " three kinds sludge" can be incinerated by mixing with coal and have high economic value.On the basis of the experiment,the technical scheme,process flow and operating parameters of the “ three kinds sludge” treatment of the stacking screw machine were determined.The main process is as follows: “Three kinds sludge” is processed by a stacking screw machine and sent to a mixer for stirring and drying by a screw conveyor.The dried product is mixed with coal and mixed with coal.To achieve the " three kinds sludge" treatment purposes: reduction,harmless,and resource.The “ three kinds sludge” experiment was processed by a stacking screw machine,and the “ three kinds sludge” treatment by the stacking screw machine has the following advantages:1.The unique dynamic and static ring filter joint structure makes the equipment not easy to block,no need to clean the filter joints,and reduce the flushing water consumption,reduce the internal circulation burden,and solve the troubles caused by the traditional dewatering equipment blockage..2.The equipment is compact in design and the workshop area is small.It accounts for about 50% of the area used for plate and frame and belt filterpresses,reducing infrastructure investment.The electric control cabinet,the flocculation mixing tank and the dehydration main body are integrated to reduce the floor space and the installation is simple and convenient.3.It can realize full-automatic 24-hour continuous operation,reduce the labor intensity of the operators,and the daily maintenance time is short,and the maintenance work is simple.The screw shaft runs at a low speed of2-3 rpm,and there is basically no vibration or noise on the scene.4.Compared with other dewatering facilities,the dewatering effect has obvious advantages.The moisture content of the mud cake after dehydration is <75%;the water quality of the filtrate is clear and transparent,and the petroleum content of the filtrate is <100mg/L,COD <800mg/L,SS≤200mg/L,all achieved good results.5.The stacking machine has low processing cost.The operation of the stacking screw is very low,because it has a filter structure that is not easy to cause clogging of the mesh.Compared with the filter-type dewatering machine,it can save water and save water and protect the environment.The dosage of the medicament can be adjusted according to the dehydration effect to control the cost of the medicament.Through the exploration,adaptation and improvement of the " three kinds sludge" experiment of the stacking screw machine,the industrialization goal of the experimental device was finally realized,anditwas the first enterprise of Sinopec to use this technology to industrially process the " three kinds sludge".The technology also passed the EIA and obtained the qualification for handling hazardous chemicals.It can be seen that the stacking screw machine can handle the refining and chemical “ three kinds sludge” and solve the problem of long-term troubled “ three kinds sludge” treatment of refining and chemical enterprises.This technology is more advanced and efficient than traditional centrifugal separation technology,and has high operation.Reliability,ease of use,low energy consumption,and full automation.Its investment is low,and its economic and social benefits are high.Has the prospect of promotion to other refining companies. |
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