CN101381134A - Stone processing sewage treatment process and system - Google Patents

Abstract

The invention provides a stone processing sewage treatment process and a sewage treatment system. The sewage treatment process is: sewage first flows into the sedimentation tank, and coagulants and coagulants are added to the sewage in the sedimentation tank. The suspended solids in the sewage form stone mud at the bottom of the sedimentation tank, and the upper layer of clear water is filtered for secondary settlement. Stone mud and clear water are formed, and the sedimentation tank and the stone mud after secondary sedimentation are extracted through pipelines and then press-filtered. The treatment system includes a sedimentation tank, a secondary sedimentation tank and a clean water tank. The lower ends of the sedimentation tank and the secondary sedimentation tank are only provided with slopes on one side, and the two slopes form a cone. The upper ends of the sedimentation tank and the secondary sedimentation tank are equipped There is an overflow port, and a filter screen is installed at the overflow port. The bottom of the sedimentation tank and the secondary sedimentation tank are equipped with agitators and mud pumping pipes. The mud pumping pipes are connected to the centrifugal pump, and the centrifugal pump is connected to the filter press. The invention integrates coagulation, clarification and filtration, has compact structure and simple process, and the sludge treatment after separation has little impact on the environment.

Description

Stone processing sewage treatment process and system

technical field

The invention relates to a system for sewage treatment in stone processing and its process flow, belonging to the technical field of sewage treatment in stone processing.

Background technique

A large amount of mud and muddy water are produced in the process of stone processing and production. At present, the commonly used muddy water treatment systems mainly include vertical sewage treatment systems and sedimentation tank sewage treatment systems. The vertical sewage treatment system has high sewage treatment efficiency, complete sludge separation, and high separated water quality. However, this method requires a large initial investment and relatively high operation and maintenance costs, which most small and medium-sized enterprises cannot afford. The sewage treatment system of the sedimentation tank has less initial investment and lower operation and maintenance costs, but the system has low operating efficiency, poor circulating water quality, large loss of tools and motors during processing, and the problem of difficult sludge treatment. The environment causes secondary pollution.

Contents of the invention

The invention aims at the problems of high operating cost, poor quality of circulating water and pollution to the environment existing in the sewage treatment system in the existing stone processing process, and provides a stone processing sewage that can improve the quality of circulating water, reduce operating cost and reduce environmental pollution A treatment process is provided, and a sewage treatment system for realizing the process is provided at the same time.

Stone processing sewage treatment process of the present invention is:

The sewage generated during stone processing first flows into the sedimentation tank, and coagulants and coagulants are added to the sewage in the sedimentation tank to accelerate the settlement of suspended solids in the stone sewage and increase the particle size of colloids and suspended solids in sewage. Suspended solids form stone mud at the bottom of the sedimentation tank, and the upper layer of clear water is filtered and overflows into the secondary sedimentation tank for secondary sedimentation. Stone mud continues to form at the bottom of the secondary sedimentation tank, and the upper layer is clear water. The upper layer of clear water overflows to the clear water tank after being filtered, and the clear water in the clear water tank is reused. The stone mud slurry at the bottom of the sedimentation tank and the secondary sedimentation tank is extracted through the pipeline and then treated by pressure filtration. The mud cake is transported abroad.

The present invention realizes the stone material processing sewage treatment system of above-mentioned process and adopts following technical scheme:

The treatment system includes a settling tank, a secondary settling tank and a clear water tank. The lower ends of the settling tank and the secondary settling tank are only provided with slopes on one side, and the two slopes form a cone. The upper ends of the settling tank and the secondary settling tank are both There is an overflow port, and a filter screen is installed at the overflow port. The bottom of the sedimentation tank and the secondary sedimentation tank are equipped with agitators and mud pumping pipes. The mud pumping pipes are connected to the centrifugal pump, and the centrifugal pump is connected to the filter press.

The invention integrates coagulation, clarification and filtration, has compact structure, simple process, low operating cost, high quality of circulating water, and little impact on the environment after separation of sludge treatment, and can solve the processing of various stone products such as marble and granite. The resulting sewage treatment problems.

Description of drawings

Fig. 1 is a structural schematic diagram of the stone processing sewage treatment system of the present invention.

Fig. 2 is a flow chart of the stone processing sewage treatment process of the present invention.

In the figure, 1. Clean water tank, 2. Centrifugal pump, 3. Filter press, 4. Return pipe, 5. Dry rock mud storage and transportation equipment, 6. Overflow port, 7. Secondary sedimentation tank, 8. Filter screen , 9, agitator, 10, sedimentation tank, 11, mud pumping pipeline.

Detailed ways

As shown in Figure 1, the stone material processing sewage treatment system of the present invention comprises the settling tank 10, the secondary settling tank 7 and the clear water tank 1 that are arranged and connected in sequence, and the lower ends of the settling tank 10 and the secondary settling tank 7 are only on one side There are slopes, and the two slopes form a cone to increase the settlement area and facilitate the centralized extraction of sludge settled at the bottom of the tank. The top of the partition wall between the sedimentation tank 10 and the secondary sedimentation tank 7 and the top of the partition wall between the secondary sedimentation tank 7 and the clean water tank 1 are all provided with an overflow port 6, and a filter screen 8 is installed at the overflow port. The bottoms of the sedimentation tank 10 and the secondary sedimentation tank 7 are equipped with an agitator 9 and a mud pumping pipeline 11, and the two mud pumping pipelines are connected together and the centrifugal pump 2 is connected, and the centrifugal pump 2 is connected with the filter press 3. The clean water formed by the filter press 3 flows back to the clean water pool 1 through the return pipe 4 for reuse, and the mud cake formed after treatment falls into the dry mud cake storage and transportation equipment 5, or directly falls into the loading truck for outbound treatment .

Fig. 2 shows the flow chart of the stone processing wastewater treatment process of the present invention. The stone processing sewage treatment process will be described in detail below in combination with the treatment system shown in Figure 2 and Figure 1 .

The sewage produced by stone processing flows into the sedimentation tank 10 through the trench. In order to accelerate the settlement of suspended solids in stone sewage and to increase the particle size of colloids and suspended solids in stone sewage, coagulants and coagulants are added to the sewage in the sedimentation tank. The suspended matter in the stone sewage undergoes physical and chemical reactions, the particle size and weight gradually increase, and the sedimentation speed accelerates, gradually forming stone mud at the bottom of the sedimentation tank 10, and the upper layer is clear water. As the amount of sewage increases, the upper clear water is filtered through the filter screen 8 at the overflow port 6 and overflows to the secondary sedimentation tank 7 for secondary settlement. Similarly, stone mud is formed at the bottom of the secondary sedimentation tank, and the upper layer is clear water. The upper layer of clear water in the secondary sedimentation tank 7 overflows into the clear water tank 1, and the clear water in the clear water tank 1 flows back to the production workshop for utilization. After the bottom of the sedimentation tank 10 and the secondary sedimentation tank 7 is stirred by the agitator 9, it is pumped into the filter press 3 by the centrifugal pump 2 for treatment, and the clean water formed by the press filter flows back to the clean water tank 1 for reuse through the return pipe 4. The formed rock mud cake falls into the dry rock mud storage and transportation equipment 5, or directly falls into the loading truck for external transportation.

Claims (2)

1. A stone processing wastewater treatment process, characterized in that: the sewage produced in the stone processing process first flows into the sedimentation tank, and coagulants and coagulants are added to the sewage in the sedimentation tank to accelerate the sedimentation of suspended matter in the stone wastewater And increase the particle size of colloids and suspended solids in the sewage. The suspended solids in the sewage form stone mud at the bottom of the sedimentation tank. The upper layer of clear water is filtered and overflows into the secondary sedimentation tank for secondary sedimentation. Stone mud is formed, and the upper layer is clear water. The upper clear water in the secondary sedimentation tank overflows to the clear water tank after being filtered. The clear water in the clear water tank is reused. Filtration treatment, the filter formed into the clear water tank, the mud cake formed after treatment is transported outside for treatment. 2. A stone processing sewage treatment system that realizes the process described in claim, the treatment system includes a sedimentation tank, a secondary sedimentation tank and a clean water tank, and it is characterized in that: the lower ends of the sedimentation tank and the secondary sedimentation tank are only on one side There is a slope, the two slopes form a cone, the upper end of the sedimentation tank and the secondary sedimentation tank are equipped with an overflow port, the filter is installed at the overflow port, and the bottom of the sedimentation tank and the secondary sedimentation tank is equipped with agitator and the mud pumping pipe, the mud pumping pipe is connected with the centrifugal pump, and the centrifugal pump is connected with the filter press.

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