Supply of sewage treatment equipment for Runchuang Environmental Protection Water Washing Plant in Tianshui City

The company's main business includes medical sewage treatment equipment, domestic sewage treatment equipment, industrial wastewater, washing, breeding, slaughtering, food, printing and dyeing, tourism areas, urban and rural sewage transformation and treatment, and other water treatment equipment processes. It has a small footprint, low investment, and stable effluent standards. Welcome new and old customers to visit and purchase at the factory.

Business principles:

Regardless of the size of the project, every detail must be personally experienced. To provide customers with excellent pre-sales, in sales, and after-sales services, and to develop suitable water treatment equipment and equipment plans based on the user's water usage conditions, achieving economic practicality, high quality, and efficiency.

The design scope of Tianshui Water Washing Plant includes the entire treatment process design of the sewage treatment project, including direct engineering such as equipment selection and installation, as well as indirect engineering such as design, commissioning, and training of this project; But it does not include auxiliary projects such as civil engineering construction, external power supply, water diversion, drainage and greening, roads, etc., nor does it temporarily consider auxiliary projects such as communication, transportation, power supply and distribution, heating, etc. for sewage treatment stations.

Design inlet water quality

The wastewater from this project belongs to high concentration organic wastewater. The raw water quality indicators are as follows, as shown in Table 1.

Table 1 Inlet water quality table

emission standard

According to the requirements of the local environmental protection department, the effluent quality indicators must meet the Class A standard requirements of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), and the relevant water quality indicators are shown in Table 2.

Table 2 Wastewater Discharge Standards

a/o process

The A/O process uses activated sludge as a biological carrier and achieves oxygenation of wastewater through the action of fan oxygen supply and aeration. Mechanical agitation is installed in tank A, and the reflux liquid from tank O flows back to tank A. Denitrification reaction is carried out in tank A, reducing most of the nitrate nitrogen to nitrogen gas, and the nitrogen gas overflows from the wastewater through agitation, achieving the goal of removing ammonia nitrogen; The effluent from tank A flows to tank O, which is equipped with blast aeration to remove most organic pollutants and convert most of the ammonia nitrogen in the influent into nitrate nitrogen; The concentration of activated sludge in the O-stage tank can be adjusted according to the needs of the wastewater, and the organic matter in the wastewater can be adsorbed, oxidized, and decomposed through the microbial flocs in the activated sludge; High removal rate of organic matter and ammonia nitrogen. However, due to the lack of an independent sludge return system, it is not possible to cultivate sludge with * function, and the degradation rate of difficult to degrade substances is relatively low; At the same time, in order to improve denitrification efficiency, it is necessary to increase the internal circulation ratio, which increases operating costs. In addition, the internal circulation liquid comes from the aeration tank and contains a certain amount of DO, which makes it difficult to maintain the ideal anoxic state in section A, affecting the denitrification effect and making it difficult to achieve a denitrification rate of 90%.

3. SBR method

SBR method is a relatively advanced activated sludge treatment method developed in recent years. This treatment process integrates an aeration tank and a sedimentation tank, with continuous water inflow, intermittent aeration, and sewage sedimentation and removal of supernatant when the gas is stopped, forming a cycle that repeats itself. The SBR method does not have sedimentation tanks or sludge return equipment, but it operates intermittently and requires multiple treatment units. The inflow and aeration are switched between each other, making the control more complex. In order to ensure the overflow rate, the SBR method requires high manufacturing standards for the decanter equipment, and must strive for excellence during production, otherwise it is easy to cause the final effluent water quality to not meet the standards. At present, there are no high-quality decanting equipment in China, and the procurement of imported equipment is troublesome and expensive. At the same time, the maintenance costs will also be high in the future. The sludge concentration in the SBR process tank is measured by a concentration meter to control the amount of excess sludge discharged. Currently, the immaturity of concentration meter technology in China can lead to difficulties in controlling SBR sludge discharge.

4. Contact oxidation method

The biological contact oxidation method is a traditional biochemical treatment method, in which the biological filler is a semi soft filler on a fixed bed. Using semi soft fillers as attachment carriers for microorganisms. The organisms are evenly distributed on the biological packing, which avoids the phenomenon of uneven distribution of microorganisms. At the same time, the organisms adhere to the surface of the packing and do not flow with water. Due to the strong agitation of the rising airflow, the biofilm is constantly renewed, thereby improving the purification effect. The contact oxidation method has the advantages of short treatment time, small volume, good purification effect, good and stable effluent quality, no need for sludge reflux or expansion, and low power consumption. Its main characteristics are:

High volumetric load and strong resistance to impact load;

Having the advantages of membrane method, with less residual sludge;

It has the advantages of activated sludge process, supplemented by mechanical equipment for oxygen supply, high biological activity, and short sludge age;

Can decompose substances that are difficult to decompose by other biological treatments;

Easy to manage, eliminating drawbacks such as sludge flotation and expansion.

In summary, the biological treatment of this project is planned to adopt the "hydrolysis acidification+contact oxidation method".

5. Air flotation equipment

Air flotation equipment is used to suspend suspended solidsA water treatment equipment that attaches bubbles and rises to the water surface, thereby separating water and suspended solids. It also makes waterSurfactantIt is attached to the bubble surface and floats to separate from water, which is called foamAir flotation methodThe equipment used in the air flotation method, including those used to complete the separation processfloatation tankAnd auxiliary equipment that generates bubbles. In water treatment, air flotation method can be usedPrecipitation methodIn situations where it is not suitable, it can be used to separate suspended solids with a specific gravity close to water and difficult to precipitate, such as oils, fibers, algae, etc. It can also be used for concentrationActivated sludge.

The operation of air flotation equipment mainly relies on the hydrophilic and hydrophobic surfaces of suspended solids. hydrophobicThe surface of particles is prone to attaching bubbles, so the air flotation method can be used.Hydrophilic particlesAfter being treated with appropriate chemicals, it can become hydrophobic. The air flotation method in water treatment commonly uses coagulants to agglomerate colloidal particles intoFloc bodyThe floc has a network structure, which makes it easy to trap bubbles, thereby improvingAir flotationEfficiency. Furthermore, if there is any in the waterSurfactants (such as detergents) can form foam and also attach suspended particles to rise together.

The sewage is collected and enters the grid channel, where the grid intercepts larger floating and suspended solids in the water and then enters the regulating tank (pre aeration is adopted in the regulating tank). After homogenizing the water quality, it is pumped into the air flotation tankSolid-liquid separationAfter sedimentation, the effluent enters the anaerobic tank for anaerobic treatment, which significantly reduces the BOD in the wastewater under the decomposition of anaerobic bacteria₅It flows into the hydrolysis and acidification tank of section A, where the sewage undergoes hydrolysis and acidification, decomposing difficult to biodegrade large molecular organic matter into easily biodegradable small molecular organic matter. The effluent from the acidification tank in section A flows into the contact oxidation tank in section O. Due to the previous hydrolysis and acidification of the sewage, the biodegradability of the sewage is greatly improved, and a large number of microorganisms are used to remove organic matter from the sewage. At the same time, aerobic microorganisms are used to carry out nitrification reactions in the wastewater, converting ammonia nitrogen (NH3-N) into nitrite (NO2-) and nitrate (NO3-). The effluent flows into the MBR tank for membrane filtration and separation before meeting the discharge standards.

Process Selection

This process adopts a treatment process with biochemical treatment as the core, designed asGrille+regulating tank+air flotation equipment+flocculation sedimentation+A/O+Quartz sand filter tank+disinfection processThe process is mature and reliable, with simple operation and low investment and maintenance costs.

Process Flow Diagram

other expenses

There is no need to increase the labor quota for this project, so there are no additional personnel salary and welfare expenses.

The electricity operation cost required for the operation of this project is due to the intermittent operation of the equipment

The total time is calculated based on 8 hours, with a running power of 4kw and an equipment operating power of tons for water treatment

The cost is approximately 0.38 yuan.

The PAC/PAM chemicals required for the operation of this project have a water treatment cost of approximately 0.13 yuan per ton.

The chlorine dioxide agent required for the operation of this project has a water treatment cost of approximately 0.025 yuan per ton.

The total cost required for the operation of this project, including the cost of treating one ton of water, is approximately 0.535 yuan.

Engineering investment estimation

The civil engineering part shall be provided with design drawings by the design party, and the construction party shall carry out construction according to the drawings. The cost of civil engineering is not included in this investment quotation.

Electrical and Automatic Control

1. Because the total installed load of the sewage treatment equipment is not high, there is no need to set up a separate substation. It can be directly connected from the substation in the project area. The electrical part of this plan only considers electrical control from the distribution room.

2. The programmable controller used centrally controls the entire process flow, and the start and stop of the water pump are controlled by the water level controller. At the same time, the switching between the water pump and the fan can be automatically completed. At the same time, the system is equipped with overload protection and power-off protection functions.

Environmental protection, occupational safety and health

The sewage treatment project itself is an environmental and energy-saving project, which has important practical significance for resource recovery, comprehensive utilization, water conservation, pollution reduction, and protection of nearby groundwater and river water quality. However, the project itself also has certain sources of pollution, and measures must be taken to eliminate them.

Safety protection, energy conservation, fire protection

safety protection

In response to the safety issues of the project itself, the following measures are taken in the design of the sewage station to ensure the safety of production:

(1) Each device is equipped with necessary protective measures to ensure safe operation.

(2) All electrical equipment shall be properly grounded and connected according to relevant national standards.

(3) The layout of electrical equipment and all transmission machinery and transmission machinery equipment should pay attention to leaving sufficient safe operating distance and setting up safety protective covers.

(4) The sewage treatment system is equipped with overflow and overflow pipelines to prevent equipment failure and accidents.

(5) Before the operation of the sewage treatment system, corresponding safety regulations should be formulated, and operators should receive necessary professional technical training before taking up their posts to ensure the normal operation of the sewage treatment plant.

Energy saving

(1) The selected control system and instruments are adjusted reasonably to ensure efficient operation.

(2) Reasonably select the inlet pump and fan, so that the working efficiency of the pump and fan is always in the high efficiency zone.

(3) The system control equipment adopts independent control. According to the operating conditions, the operation of the equipment can be adjusted reasonably to achieve the goal of energy conservation and consumption reduction.

fire fighting

According to the "Code for Fire Protection Design of Buildings" (GB116-87) and relevant national regulations and documents:

All buildings in the sewage station are designed with a second level fire resistance rating, and their walls, columns, beams, floors, stairs, ceilings, etc. are made of non combustible refractory materials.

The sewage station does not require outdoor fire hydrants, only a sufficient number of dry powder fire extinguishers need to be installed in the equipment room.

Our company guarantees that the goods it provides are brand new, unused, using Jia materials and Yiliu technology, and meet the quality, specifications, and performance requirements specified in the contract in all aspects. And ensure that the goods are correctly installed, operated and maintained, and operate well during the service life of the goods. During the specified quality assurance period, we are responsible for any defects or malfunctions caused by design, process, or material defects, and the costs shall be borne by us. Unless otherwise specified in the contract, in the event of the above situation, if we fail to remedy the defect within thirty days after receiving notice from the buyer, the user may take necessary remedial measures, but the risks and costs will be borne by us. The user reserves the right to claim compensation for any losses caused.

Transportation

Notify the owner by phone or fax one day before the shipment of each batch of equipment for automobile transportation.

The notice specifies: consignee, shipper, equipment number, shipment date, destination, name of goods and purchase order number, total volume of goods, total number of packages, and other information.

Installation service

After receiving the buyer's request for our company to send technical personnel to the site for installation, testing, and debugging, our technical personnel will arrive within one day. During equipment installation, we will follow the detailed construction drawings approved by the user and complete them on our behalf. We are responsible for the specific installation work, and the next debugging stage can only be carried out after we confirm that the installation is correct.

Supply of sewage treatment equipment for Runchuang Environmental Protection Water Washing Plant in Tianshui City