Zero-discharge treatment process of high-concentration alkaline water from recycled plastics
A technology of recycled plastics and processing technology, which is applied in natural water treatment, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve the problems of increasing the cost of cleaning water, not being able to discharge directly, and large water consumption. Save cleaning water, improve recovery rate, and easy operation
Active Publication Date: 2019-05-14
ANHUI HUANJIA TIANYI RENEWABLE RESOURCES
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Problems solved by technology
Alkaline water is often used for cleaning, but since the cleaned sewage contains alkaline substances, it will seriously pollute the environment, so it cannot be discharged directly
And because the water consumption of plastic granules is large when cleaning, if the sewage that has been cleaned once plastic granules is directly discharged, the water cost for cleaning will increase.
At present, the simplest sewage treatment method is to use natural sedimentation method, but the sludge settled at the bottom is easy to be pumped out due to serious backlog, which makes sludge treatment more difficult
Method used
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Embodiment Construction
[0024] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elaborated below in conjunction with specific illustrations and examples.
[0025] (1) Pump the alkaline sewage after cleaning the plastic particles into the settling tank 1, and add an agglomerating agent, and after fully stirring, let it stand for stratification, so as to form a three-layer structure of suspended plastic particles in the upper layer, clear water in the middle layer and sludge in the lower layer, The suspended plastic particles in the upper layer are removed through the filter screen 10, and the sludge in the lower layer together with the clear water in the middle layer is discharged into the sludge conveying pipeline 2 through the mud outlet 8 at the bottom of the settling tank;
[0026] (2) The sludge water in the sludge conveying pipeline is sent into the filter press 4 through the slud...
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The invention discloses a zero-discharge treatment process of recycled plastic high-concentration alkaline water and relates to the field of recycled plastic processing technology. After settling separation of a sedimentation tank, filter-pressing is carried out by a filter press to obtain clear water; and the clear water is used for backwashing sludge deposited on the bottom of the sedimentation tank so as to pump out the sludge. The sludge treatment method is suitable for treatment of sewage from washing of recycled plastic particles, and is simple to operate. After separation of suspended plastic particles and sludge, clear water obtained is used for cleaning the next batch of particles so as to save cleaning water amount. By the use of an agglomeration solution, recovery rate of the suspended plastic particles is enhanced, and secondary pollution to sewage will not be caused. In addition, through backwashing with the clear water, the sludge can be prevented from being hard to pump out due to severe deposition.
Description
Technical field: [0001] The invention relates to the technical field of recycled plastic processing, in particular to a process for treating recycled plastic with high-concentration alkaline water and zero discharge. Background technique: [0002] Recycled plastic granules belong to the category of plastic granules. Recycled plastics are plastics produced by recycling used new materials or waste plastics through a screw machine, and then cut into granules by a pelletizer. particles. Since recycled materials contain dust, oil, etc., plastic particles need to be cleaned. Alkaline water is often used for cleaning, but the sewage after cleaning can not be discharged directly because it contains alkaline substances and seriously pollutes the environment. And because the water consumption is relatively large when cleaning plastic granules, if the sewage that has been cleaned once is directly discharged, the water cost for cleaning will be increased. At present, the simplest sew...
Claims
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IPC IPC(8): C02F1/52C02F1/54C02F1/56C02F11/122C02F103/38
CPCC02F1/5263C02F1/5272C02F1/54C02F1/56C02F11/122C02F2103/38
Inventor 杨传荣宋现涛姜永俊
Owner ANHUI HUANJIA TIANYI RENEWABLE RESOURCES