Different levels of wastewater treatment plants have different construction qualifications, as follows:
I. First-class qualification standards:
1, the enterprise in the past five years has undertaken a single capacity of 200,000 kilowatts or more thermal power units coal-fired flue gas desulphurization project, or medium-sized nuclear industrial waste treatment works, or more than 4 out of the following 6 projects, the quality of the project is qualified.
(1) Biogas digester project for poultry and livestock manure with a single pool volume of more than 400 cubic meters;
(2) Anaerobic biochemical treatment pool project with a single pool volume of more than 500 cubic meters;
(3) Comprehensive treatment project for noise, hazardous gases, dust, sewage, and industrial wastes of industrial projects of medium-sized or above;
(4) Flue gas desulfurization project of industrial and Centralized heating coal-fired boiler flue gas desulphurization project;
(5) second class B grade hospital medical sewage treatment works;
(6) a single contract value of more than 10 million yuan of environmental protection projects.
2, the manager of the enterprise has more than 10 years of experience in engineering management or a senior title; chief engineer has more than 10 years of experience in construction technology management and has a senior title in this field; chief accountant has a senior accounting title.
Enterprises have the title of the engineering and technical personnel of not less than 40 people, of which not less than 16 people with intermediate titles or above, and not less than 8 people of related professional engineering and technical personnel. Enterprises have the first-class qualification project manager not less than 5 people.
3, the enterprise registered capital of more than 10 million yuan, the enterprise net assets of more than 12 million yuan.
4, the enterprise in the past three years the highest annual project settlement income of more than 20 million yuan.
5, the enterprise has with the scope of the contracted works of construction machinery and quality testing equipment.
Two, the second level of qualification standards:
1, the enterprise in the past five years has undertaken a single capacity of 125,000 kilowatts or more thermal power units coal-fired flue gas desulphurization project, or a small nuclear industry waste disposal project, or the following six of the four or more construction projects, the quality of the project is qualified.
(1) Biogas digester project for poultry and animal manure with a single pool volume of more than 200 cubic meters;
(2) Anaerobic biochemical treatment pool project with a single pool volume of more than 300 cubic meters;
(3) Comprehensive treatment project for noise, harmful gases, dust, sewage, and industrial wastes of industrial projects of more than small scale;
(4) Flue gas desulphurization project of more than 20 tons of industrial and Centralized heating coal-fired boiler flue gas desulphurization project;
(5) Class A or above grade hospital medical sewage treatment works;
(6) more than 5 million yuan of a single contract value of environmental protection projects.
2, the enterprise manager has more than 8 years of experience in engineering management or have intermediate or higher title; technical personnel with more than 8 years of experience in construction technology management and have the senior title of the specialty; financial responsible person with intermediate or higher accounting title. The enterprise has no less than five project managers above the second level of qualification.
3, the enterprise registered capital of more than 3 million yuan, the enterprise net assets of more than 3.6 million yuan.
4, the enterprise in the past three years the highest annual project settlement income of more than 10 million yuan.
5, the enterprise has with the scope of the contracted works of construction machinery and quality testing equipment.
Three, the third level of qualification standards:
1, the enterprise in the past five years has undertaken a stand-alone capacity of 50,000 kilowatts or more coal-fired flue gas desulphurization of coal-fired thermal power units, or more than four of the following six items of engineering construction, engineering quality is qualified.
(1) Biogas digester project for poultry and animal manure with a single pool volume of more than 100 cubic meters;
(2) Anaerobic biochemical treatment pool project with a single pool volume of more than 200 cubic meters;
(3) Comprehensive treatment project for noise, hazardous gases, dust, sewage, and industrial wastes in general industrial projects;
(4) Flue gas desulphurization project for more than 10 tons of industrial and Centralized heating coal-fired boiler flue gas desulphurization project;
(5) Class B grade hospital medical sewage treatment works;
(6) a single contract value of more than 3 million yuan of environmental protection projects.
2, the enterprise manager has more than 5 years of experience in engineering management; technical personnel with more than 5 years of experience in construction technology management and has the specialty of intermediate or higher title; financial personnel with more than junior accounting title. Enterprises have more than three qualification project manager not less than five people.
3, the enterprise registered capital of more than 1 million yuan, the enterprise net assets of more than 1.2 million yuan.
4, the enterprise in the last three years the highest annual project settlement income of more than 3 million yuan.
5, the enterprise has with the scope of the contracted works of construction machinery and quality testing equipment.
Expanded Information:
One of the requirements related to the scope of the sewage treatment plant contracting project:
The first level of enterprises: can undertake the construction of various types of environmental protection projects.
Second-level enterprises: can undertake a single contract value does not exceed five times the registered capital of the construction of the following projects:
1, a single pool volume of 600 cubic meters and the following poultry, animal manure biogas project; a single pool volume of 800 cubic meters and the following anaerobic biochemical treatment pool project;
2, a single capacity of 300,000 kilowatts and the following coal-fired flue gas desulphurization of coal-fired thermal power generation unit project; 40 tons and the following industrial and central heating coal-fired boiler flue gas desulphurization project;
3, medium-sized industrial projects (including the nuclear industry), noise, hazardous gases, dust, sewage, industrial waste comprehensive treatment works;
4, the second grade and the following grade of hospitals, medical sewage treatment works.
Third-level enterprises: can undertake a single contract value does not exceed five times the registered capital of the construction of the following projects:
1, a single pool volume of 300 cubic meters and the following poultry, animal manure biogas project; a single pool volume of 400 cubic meters and the following anaerobic biochemical treatment pool project;
2, a single capacity of 200,000 kilowatts and the following coal-fired thermal power generation units, desulfurization of coal-fired flue gas project; 20 tons and the following industrial and central heating coal-fired boiler flue gas desulphurization project;
3, small industrial projects, noise, harmful gases, dust, sewage, industrial waste comprehensive treatment works;
4, first-class A and the following grade of hospitals, medical sewage treatment works.
Two, sewage treatment technology:
1, primary treatment: the main removal of sewage in a suspended state of solid pollutants, most of the physical treatment method can only complete the requirements of primary treatment. After primary treatment of sewage, BOD can generally remove about 30%, not up to discharge standards. Primary treatment belongs to the pretreatment of secondary treatment.
2, secondary treatment: the main removal of sewage in the colloidal and dissolved organic pollutants (BOD, COD substances), the removal rate of up to 90% or more, so that organic pollutants to meet the discharge standards, the removal rate of suspended solids up to 95% of the effluent effect is good.
3, tertiary treatment: further treatment of difficult to degrade organic matter, nitrogen and phosphorus can lead to eutrophication of the water body, such as soluble inorganic substances. The main methods are biological denitrification and phosphorus removal method, coagulation and precipitation method, sand filtration, activated carbon adsorption method, ion exchange method and electrodialysis method.
The whole process is through the coarse grating of raw sewage through the sewage lifting pump, after lifting, through the grating or sieve rate, and then into the sand sedimentation tank, after the sand and water separation of sewage into the initial sedimentation tank, the above is the first level of treatment (i.e., physical treatment), the effluent of the initial sedimentation tank into the biological treatment equipment;
There are activated sludge and biofilm methods, (which activated sludge method reactor has) Aeration tank, oxidation ditch, etc., biofilm method, including biofilter, biological rotor, biological contact oxidation and biofluidized bed), the effluent of the biological treatment equipment into the secondary sedimentation tank;
The effluent of the secondary sedimentation tank after disinfection and discharge or into the tertiary treatment, the end of the first level of treatment to the end of the second level of treatment, the third level of treatment, including biological denitrification and removal of phosphorus, coagulation and precipitation, sand filtration, activated carbon adsorption, ion exchange method and electrodialysis method, and the third level of treatment. Ion exchange and electrodialysis.
Sludge from the secondary sedimentation tank is partly returned to the primary sedimentation tank or biological treatment equipment, partly goes into the sludge thickening tank, and then goes into the sludge digestion tank, and after dewatering and drying equipment, the sludge is finally utilized.
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