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Complete sets of equipment for rural sewage
1 Overview
1, name
Reclaimed water reuse project for domestic sewage treatment
2, the amount of water
Design according to owner's requirement
3, project profile
Requirements of sewage treatment by the indicators to achieve the "integrated wastewater discharge standard" GB8978-1996; two standards.
After the project is put into use, it can reduce the discharge of waste water, reduce the environmental pollution effectively, and make full use of the water resource.
4, program preparation unit
Shandong Mei Yang environmental protection technology Co., Ltd.
2 design principles
A to implement the state's basic national policies on environmental protection, the implementation of national and local policies, regulations, norms and standards;
B in the treatment of water to meet the requirements of the premise, so as to save investment, give full play to the social, economic and environmental benefits of sewage treatment projects;
C selection process is flexible, convenient operation and management, and stable and reliable processing technology;
D design as far as possible according to the functional division, in order to ensure the effectiveness of the treatment of compact.
In the e design to consider automatic operation, to reduce the labor intensity of operators;
F components into the sewage treatment system to consider the shock absorption, noise reduction, deodorant and other measures to eliminate the two pollution of the environment.
3 water quality and treatment targets
A, sewage water inlet water quality
Comprehensive analogy of similar projects and related manuals, water, the specific water quality indicators are as follows:
Serial number | project | numerical value |
1 | CODcr | 400mg/L |
2 | BOD5 | 200mg/L |
3 | ammonia nitrogen | 35mg/L |
4 | SS | 200mg/L |
5 | PH | 6～9 |
B, treatment of effluent water quality
According to the requirements of the views of the owners to determine designed effluent quality to achieve "urban miscellaneous water standard of GB / T18920-2002 greening water discharge standards and specific indicators listed in the following table.
Serial number | project | numerical value |
1 | CODcr | ≤120mg/L |
2 | BOD5 | ≤60mg/L |
3 | ammonia nitrogen | ≤20mg/L |
4 | SS | ≤60mg/L |
5 | PH | 6～9 |
4 principles of process selection
A process has been successfully applied to the engineering of similar raw water conditions, and more mature operation and operation management experience.
B process of low energy consumption, operating costs, the operation and management of ancillary equipment is simple and convenient, easy to achieve automatic control.
5 selection of treatment process
A, processing technology feasibility measures
Organic impurities in domestic sewage are more, CODcr and BOD5 are higher, and the value of BOD5/CODcr is more than 0.4, and the biochemical properties are better. Should adopt the process dominated by biochemical process, due to the sewage water is large, biochemical treatment by underground integrated sewage treatment equipment. Before entering the biochemical device, as far as possible in the pretreatment stage will be floating in the sewage and large particles suspended impurities removal, backward into the sewage conditioning tank, in order to prevent the adverse effects of sewage pump upgrade.
B, specific technological process
The sewage treatment process is shown as follows: (see the process flow chart)
Domestic wastewater treatment by septic tank, bathing wastewater after hair collector deals with the rest of the sewage mixed into the septic tank, the pump after the upgrade of the flows through grille, removal of large particles of suspended impurities into the sewage pool regulation, regulation pool in sewage by the lift pump ascending into integration of sewage treatment equipment, sewage in the device after hydrolysis acidification, biological contact oxidation and precipitation process, after the water enters into the filter, after filtration, disinfection, the effluent reached the row for afforestation. Integration equipment in sedimentation tank sludge by gas stripping modes of transport to the integrated equipment in the sludge tank, sludge in the sludge concentration, sedimentation and digestive and supernatant return to regulation pool with raw wastewater together to deal with. The concentrated sludge (about half of a regular) by pumping truck transport.
6 facility description
A, grille
The grille is fixed, the material is stainless steel mesh. Set the thickness of two road, for the removal of large particles suspended solids and floating impurities.
B, regulating pool, lifting pump
Because of the large fluctuation of water quality and water quantity, the water quality and quantity of the integrated sewage treatment equipment will be stable.
Regulating tank configuration submersible sewage pump will be upgraded to integrated wastewater treatment equipment.
C, hydrolytic acidification tank
Hydrolytic acidification tank assembly packing. In this pool, under the action of hydrolysis acidification microorganisms, the hydrolysis of macromolecular organic impurities into small molecular substances, which is conducive to the decomposition of aerobic bacteria in the contact oxidation pool.
D, biochemical treatment
According to the aforementioned sewage water quality and discharge requirements, combined with the characteristics of sewage. The biochemical system will contact oxidation pond, sedimentation pool, sludge tank, blower room, disinfected pool portion of the synthesis of various, each part has the corresponding function, parts are mutually connected, the final effluent standards, respectively, are described as follows:
Contact oxidation pool with filler. The lower part is provided with an aeration device, and the ABS engineering plastic pipe is used as an aeration system, and the air source of the aeration system is provided by a specially arranged fan.
The upper part of the sedimentation tank is provided with a water weir to adjust the water level of the water outlet; the lower part is provided with a conical sedimentation area and a sludge gas stripping device, and the air source is provided by the air blower.
The residence time of the sludge in the sludge pond was about 60 days. System settling sludge produced by the stripping method sludge is discharged into the pool, sludge in this concentration, sedimentation and storage, at the bottom of the pool is equipped with an aeration pipe to prevent sludge anaerobic digestion to produce biogas, and sludge oxidation to reduce the total amount of sludge; sludge concentration on a regular basis is transported by suction de la Villette. The upper part of the sludge pond is provided with a supernatant return device, which causes the supernatant to overflow to the acid hydrolysis tank.
F, disinfection: before the end of the water, with chlorine dioxide disinfection.
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