Research On Wastewater Treatment Technology And Recycling Of Concrete Mixing Plant

Concrete will be the main building material in the field of infrastructure and civil construction for a long time,but the amount of waste water discharged by the concrete mixing station is very large every year.In order to realize the green production of concrete,it is necessary to find a reasonable way for the disposal and utilization of waste water.There are some shortcomings in the traditional wastewater treatment process of the mixing plant,and the components of the wastewater from the treatment are quite different,so many experts and scholars have different conclusions on the recycling of wastewater,and the actual recycling rate of the wastewater from the mixing plant has a certain space to improve.Combined with the requirements of green development of the industry and the actual needs of Sichuan Xing Cheng Gang Rui building materials Co.,Ltd.,the subject first analyzes the main sources and characteristics of the wastewater from the mixing plant.In order to make the physical and chemical properties of the wastewater more stable,the design idea of "divide and rule" is determined,and the reasonable treatment processes are designed according to the nature of the wastewater.Then,it analyzes that the core work of waste treatment is the disposal of waste slurry water of wash concrete,because it produces the largest amount and its physical and chemical properties may change greatly with the passage of time,such as improper disposal will have a huge impact on environmental protection.Finally,the physical and chemical properties of the slurry are analyzed,and the influence of the recycled slurry on the performance of concrete is studied.It is found that with the increase of the amount of slurry water,the performance of C30 and C50 concrete becomes worse,the initial slump and expansion become smaller,and the loss rate of slump and expansion becomes larger and larger.When the amount of slurry water is the same,with the extension of storage time,the working performance of C30 and C50 concrete will become worse,the initial slump and expansion will become smaller,and the slump and expansion time loss rate will become larger and larger.In C30 and C50 concrete,in order to ensure the working performance of concrete.The proportion of fresh pulp water can reach 80%,the longer the storage time of slurry water is,the less the mixing proportion should be.The compressive strength of C30 and C50 concrete increases with the increase of curing time,and when the same age of slurry is used,the compressive strength of concrete increases with the increase of the amount of slurry.The mixture of slurry makes the C30 concrete reach 50.2 MPa,and the C50 concrete reach 77.4 MPa.Under the same amount of slurry,the compressive strength of C30 concrete decreases with the increase of slurry storage time,and the storage time has a greater impact on its early compressive strength,and the effect of storage time on its early compressive strength is more obvious under the high amount of slurry.The compressive strength of C50 concrete decreases with the increase of storage time,and the storage time has a great influence on its 28 day compressive strength.The shorter the storage time of slurry is,the better the strength of concrete will be;the mixing amount of slurry should be adjusted with the change of storage time,and the mixing amount of slurry with long storage time should be reduced.With the increase of the amount of slurry,the carbonation resistance,frost resistance and sulfate resistance of concrete will be improved in varying degrees.Using waste slurry water from mixing plant in concrete not only achieves the effect of energy conservation and environmental protection,but also achieves the purpose of cost reduction and efficiency increase.