Sewage treatment method for industrial enterprise

Abstract

The invention discloses a sewage treatment method of an industrial enterprise. The treatment method and process of a whole treatment system from front to back are as follows: incoming water, an interception grate, a coarse screen, a fine screen, a pre-sedimentation tank, a sedimentation tank, a filter and reclaimed water reuse; wherein sludge water of the preliminary sedimentation tank and sludge water of the sedimentation tank are conveyed to the concentration tank and the plate-and-frame filter, and sludge cakes are conveyed outwards. The invention aims to provide the sewage treatment method for the industrial enterprise, and the treated sewage is industrial and domestic mixed wastewater, so that the sewage can be reused, the pressure of water resource shortage is relieved, and sustainable utilization of water resources is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment method for an industrial enterprise. Background Art

[0002] In today's society, with the acceleration of industrialization and urbanization, water pollution is becoming increasingly serious. A large amount of industrial wastewater and domestic sewage are directly discharged without effective treatment, posing a huge threat to the ecological environment and human health.

[0003] Traditional sewage treatment methods have gradually revealed their limitations in response to increasingly complex sewage compositions and strict discharge standards. For example, some simple physical and chemical treatment methods may not be able to effectively remove pollutants such as dissolved organic matter, nitrogen, and phosphorus in sewage; biological treatment methods may be affected by factors such as water quality fluctuations and temperature changes, and the treatment effect is unstable.

[0004] In addition, with the increasing awareness of environmental protection, people's requirements for sewage treatment are not only to meet the discharge standards, but also to pay more attention to resource recycling and energy conservation. Therefore, it is imperative to develop more efficient, energy-saving and environmentally friendly sewage treatment systems and methods to achieve the goals of sustainable use of water resources and environmental protection.

[0005] Compared with the existing patent CN 115072939 A, the present invention introduces a method for smoothly operating a conventional sewage treatment system, wherein the water treatment equipment and facilities of the system include: a coarse screen, a fine screen, a pre-sedimentation tank, a sedimentation tank, a filter, a concentration tank, a plate and frame filter, etc.; whereas the existing patent CN 115072939 A mainly introduces another sewage treatment system, which includes a primary treatment system for solid-liquid separation treatment of sewage and a secondary treatment system for removing organic matter in a colloidal and dissolved state in sewage. Although a small part of the sewage treatment equipment and facilities are the same as those of the present invention, the processes are quite different. Summary of the invention

[0006] The purpose of the present invention is to provide a sewage treatment method for industrial enterprises. The treated sewage is industrial and domestic mixed wastewater. After treatment, the sewage can be reused, the pressure of water shortage is alleviated, and the sustainable utilization of water resources is realized.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention provides a method for treating sewage in an industrial enterprise, comprising:

[0009] 1). The incoming water is first intercepted by the interception grate, coarse screen and fine screen;

[0010] 2). The water out of the fine screen is pumped into the pre-sedimentation tank through the lifting pump for the first sedimentation;

[0011] 3). The effluent from the pre-sedimentation tank flows into the sedimentation tank for secondary sedimentation, and bactericides are regularly added during the treatment of the sedimentation tank water to remove bacteria and microorganisms in the water. The dosage is dynamically adjusted according to the water quality and water volume of the incoming water;

[0012] 4). The effluent from the sedimentation tank enters the water storage tank and then enters the multi-media filter for filtration through a booster pump. The multi-media filter needs to be regularly added with surfactants to remove oil from the water. The dosage is dynamically adjusted according to the degree of pollution of the incoming water;

[0013] 5). The water produced by the multi-media filter is recycled through the booster pump and sent to the user;

[0014] 6). The concentration tank receives the muddy water from the pre-sedimentation tank and the sedimentation tank for concentration. The concentrated muddy water at the bottom of the tank is pumped into the plate and frame filter through the slurry pump. The plate and frame filter further squeezes the mud to form a mud cake for external transportation. The supernatant in the concentration tank flows back to the front of the coarse screen and enters the next cycle.

[0015] Furthermore, PAM and PAC agents are added to the pre-sedimentation tank during the pre-sedimentation tank water treatment, and the dosage is dynamically adjusted according to the water quality and water volume of the incoming water. 3. The sewage treatment method of an industrial enterprise according to claim 1 or 2 is characterized in that the pre-sedimentation tank is regularly drained of mud, and the drained mud water flows from the bottom of the tank to the concentration tank, and the draining time is dynamically adjusted according to the water quality of the incoming water.

[0016] Furthermore, the sedimentation tank is regularly drained of sludge, and the sludge water flows from the bottom of the tank to the concentration tank by gravity, and the sludge discharge time is dynamically adjusted according to the quality of the incoming water.

[0017] Furthermore, the multi-media filter is backwashed regularly, and the backwashing period is dynamically adjusted according to the total water inlet pressure of the filter and the water output of the multi-media filter.

[0018] Furthermore, the backwash water comes from the produced water of the multi-media filter.

[0019] Furthermore, the backwashed water flows by gravity to the front of the coarse screen and enters the next cycle.

[0020] Furthermore, the multi-media filter is regularly cleaned by adding a surfactant to remove oil according to the operating conditions.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are:

[0022] The water treatment equipment such as coarse screens, fine screens, pre-sedimentation tanks, sedimentation tanks, filters, concentration tanks, plate and frame filters operate smoothly, and the entire sewage treatment system operates stably. The qualified reuse of reclaimed water and the environmental protection indicators meet the standards, preventing sewage from being directly discharged into the natural environment, alleviating the pressure of water shortage, achieving sustainable use of water resources, ensuring that enterprises and social activities comply with relevant environmental protection laws and regulations, and avoiding penalties for illegal discharge. DETAILED DESCRIPTION

[0023] A method for treating sewage in an industrial enterprise, comprising:

[0024] 1. The incoming water is intercepted by the interception grate, coarse screen and fine screen, which can basically intercept some larger debris such as wood, beverage bottles, plastic bags, branches, plastic sticks, etc.

[0025] 2. The effluent from the fine screen is pumped into the pre-sedimentation tank for the first sedimentation. The pre-sedimentation tank water treatment method requires the addition of PAM and PAC agents, and the dosage is dynamically adjusted according to the water quality and water volume of the incoming water. The pre-sedimentation tank is regularly drained of mud, and the drained mud water flows from the bottom of the tank to the concentration tank. The draining time is dynamically adjusted according to the water quality of the incoming water.

[0026] 3. The effluent from the pre-sedimentation tank flows into the sedimentation tank for secondary sedimentation. The sedimentation tank water treatment method requires regular addition of bactericides to remove bacteria and microorganisms in the water. The dosage is dynamically adjusted according to the water quality and water volume of the incoming water. The sedimentation tank is regularly drained of mud, and the drained mud water flows from the bottom of the tank to the concentration tank. The draining time is dynamically adjusted according to the water quality of the incoming water.

[0027] 4. The effluent from the sedimentation tank enters the reservoir and enters the multi-media filter for filtration through the booster pump. The multi-media filter needs to be regularly added with surfactants to remove oil from the water. The dosage is dynamically adjusted according to the degree of pollution of the incoming water. In addition, the multi-media filter needs to be backwashed regularly. The backwashing cycle is dynamically adjusted according to the total water inlet pressure of the filter and the water output of the multi-media filter. The backwash water comes from the water produced by the multi-media filter. The backwashed water flows to the front of the coarse screen and enters the next cycle. The filter can be regularly added with surfactants for oil removal cleaning according to the operating conditions.

[0028] 5. The water produced by the multi-media filter is recycled through the booster pump and sent to the user.

[0029] 6. The concentration tank receives the muddy water from the pre-sedimentation tank and the sedimentation tank for concentration. The concentrated muddy water at the bottom of the tank is pumped into the plate and frame filter through the slurry pump. The plate and frame filter further squeezes the mud to form a mud cake for external transportation. The supernatant in the concentration tank flows back to the front of the coarse screen and enters the next cycle.

[0030] The method of the present invention mainly has the following advantages:

[0031] 1. Environmental protection: Prevent sewage from being discharged directly into the natural environment, avoid pollution of water, soil and air, and protect ecological balance and biodiversity.

[0032] 2. Water resource protection: Through treatment, sewage can be reused to alleviate the pressure of water shortage and achieve sustainable use of water resources.

[0033] 3. Ecosystem maintenance: protect the stability and function of water ecosystems such as rivers, lakes, and oceans, and promote the self-repair and normal operation of ecosystems.

[0034] 4. Promote economic development: A good sewage treatment system helps improve the environmental quality of the region, attract investment, and promote the sustainable development of industry and agriculture.

[0035] 5. Comply with regulatory requirements: Ensure that corporate and social activities comply with relevant environmental protection laws and regulations to avoid penalties for illegal emissions.

[0036] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for treating wastewater in an industrial enterprise, characterized in that: include: 1). The incoming water is first intercepted by the interception grate, coarse screen and fine screen; 2). The water out of the fine screen is pumped into the pre-sedimentation tank through the lifting pump for the first sedimentation; 3). The effluent from the pre-sedimentation tank flows into the sedimentation tank for secondary sedimentation, and bactericides are regularly added during the treatment of the sedimentation tank water to remove bacteria and microorganisms in the water. The dosage is dynamically adjusted according to the water quality and water volume of the incoming water; 4). The effluent from the sedimentation tank enters the water storage tank and then enters the multi-media filter for filtration through a booster pump. The multi-media filter needs to be regularly added with surfactants to remove oil from the water. The dosage is dynamically adjusted according to the degree of pollution of the incoming water; 5). The water produced by the multi-media filter is recycled through the booster pump and sent to the user; 6). The concentration tank receives the muddy water from the pre-sedimentation tank and the sedimentation tank for concentration. The concentrated muddy water at the bottom of the tank is pumped into the plate and frame filter through the slurry pump. The plate and frame filter further squeezes the mud to form a mud cake for external transportation. The supernatant in the concentration tank flows back to the front of the coarse screen and enters the next cycle.

2. The method for treating wastewater of an industrial enterprise according to claim 1, characterized in that: PAM and PAC agents are added during the treatment of the pre-sedimentation tank water in the pre-sedimentation tank, and the dosage of the agents is dynamically adjusted according to the water quality and water volume of the incoming water.

3. The method for treating wastewater of an industrial enterprise according to claim 1 or 2, characterized in that: The pre-sedimentation tank is regularly drained of sludge, and the drained sludge water flows from the bottom of the tank to the concentration tank by gravity. The draining time is dynamically adjusted according to the quality of the incoming water.

4. The method for treating wastewater of an industrial enterprise according to claim 1, characterized in that: The sedimentation tank is regularly drained of sludge, and the drained sludge water flows from the bottom of the tank to the concentration tank. The draining time is dynamically adjusted according to the quality of the incoming water.

5. The method for treating wastewater of an industrial enterprise according to claim 1, characterized in that: The multi-media filter is backwashed regularly, and the backwashing cycle is dynamically adjusted according to the total water inlet pressure of the filter and the water output of the multi-media filter.

6. The method for treating wastewater of an industrial enterprise according to claim 5, characterized in that: The backwash water comes from the produced water of the multi-media filter.

7. The method for treating wastewater of an industrial enterprise according to claim 1 or 5, characterized in that: The backwashed water flows to the front of the coarse screen and enters the next cycle.

8. The method for treating wastewater of an industrial enterprise according to claim 1 or 5, characterized in that: The multi-media filter is regularly cleaned by adding a surfactant to remove oil according to the operating conditions.