1 General provisions
1.0.1 This code is developed with a view to making the design of wastewater treatment engineering in petrochemical industry meet the relevant laws and regulations of the nation, preventing water pollution, improving and protecting environment and guaranteeing the people's health and safety.
1.0.2 This code is applicable to the design of constructed, renovated and extended wastewater treatment engineering in petrochemical industry.
1.0.3 The design of wastewater treatment engineering in petrochemical industry shall embody the principle of water-saving and emission reduction, energy conservation and consumption reduction as well as environmental protection, and shall be reliable in operation, reasonable in economy and advanced in technique.
1.0.4 The design of wastewater treatment engineering in petrochemical industry shall meet those specified in both this code and the current relevant standards of the nation.
2 Terms
2.0.1
polluted process wastewater
industrial wastewater polluted in the production process
2.0.2
oily wastewater
polluted process wastewater containing floating oil, dispersed oil, emulsified oil and soluble oil discharged from petrochemical plant, unit, etc.
2.0.3
spent caustic
waste lye of gasoline, diesel, liquefied petroleum gas and ethylene cracking gas after caustic wash
2.0.4
sour wastewater
polluted process wastewater containing sulfide after the product undergoing separation, dewatering or desulfurization by washing
2.0.5
accidental drainage
material leaked and wastewater produced when accident occurs or in the process of accident handling
2.0.6
polluted rainwater
rainwater polluted by material and failing to meet the standard for discharge
2.0.7
reclaimed water
water derived from wastewater which, after being properly treated, reaches certain quality standard and meets certain requirements for use
2.0.8
sludge
general term of oily sludge, scum and excess activated sludge
2.0.9
oily sludge
bottom mud containing oil discharged by oil removal facilities, air floatation facilities, regulation facilities, etc.
2.0.10
scum
flotage discharged by air floatation facilities and biological treatment facilities, etc.
2.0.11
floating oil
oil with the oil droplet size larger than 100μm
2.0.12
dispersed oil
oil with the oil droplet size falling within the range of 10μm~100μm
2.0.13
emulsified oil
oil with the oil droplet size less than 10μm
2.0.14
pretreatment
treatment with regard to certain specific pollutants before discharging the wastewater into wastewater treatment plant for meeting the influent quality of wastewater treatment plant
2.0.15
local treatment
separately treating part of the wastewater locally without discharging it into wastewater treatment plant so that it may be reutilized, recycled or directly discharged
2.0.16
advanced treatment
purification process of further treating the pollutants in the biological treatment effluent
3 Wastewater quantity and quality for design
3.1 Wastewater quantity for design
3.1.1 Wastewater quantity for design shall include polluted process wastewater quantity, domestic wastewater quantity, polluted rainwater quantity and unforeseen wastewater quantity. Various wastewater quantities shall be determined according to the following requirements:
1 The polluted process wastewater quantity shall be comprehensively determined according to consecutive hourly water drainage quantity and intermittent hourly water drainage quantity from plants (units).
2 The domestic wastewater quantity shall comply with the relevant provisions of current national standard GB 50014 Code for design of outdoor wastewater engineering.
3 The volume of polluted rainwater storage facility should be the product of the polluted zone area and the rainfall depth and may be calculated using the following equation:
Foreword ii
1 General provisions
2 Terms
3 Wastewater quantity and quality for design
3.1 Wastewater quantity for design
3.2 Wastewater quality for design
3.3 Classification of wastewater treatment system
4 Wastewater pretreatment and local treatment
4.1 General requirement
4.2 Wastewater from refining plant
4.3 Wastewater from petrochemical plant
4.4 Wastewater from oil tank farm
5 Wastewater treatment facilities
5.1 Bar screen
5.2 Regulation and equalization
5.3 Neutralization
5.4 Oil separation
5.5 Mixing
5.6 Flocculation
5.7 Air floatation
5.8 Activated sludge process
5.9 Biovelum process
5.10 Anaerobic biological process
5.11 Sedimentation
5.12 Monitoring basin
5.13 Advanced treatment
5.14 Disinfection
5.15 Wastewater reuse
6 Sludge treatment and disposal
6.1 General requirement
6.2 Calculation of sludge quantity
6.3 Sludge transportation
6.4 Sludge thickening
6.5 Sludge dewatering
6.6 Sludge drying
6.7 Sludge incineration
6.8 Sludge storage and landfill
7 Slop oil recovery
7.1 General requirement
7.2 Slop oil dewatering
7.3 Slop oil transportation
8 Exhaust gas treatment
8.1 General requirement
8.2 Exhaust gas collection and transportation
8.3 Exhaust gas treatment process
9 Emergency wastewater treatment
10 Piping design
11 Site selection and general design
11.1 Site selection
11.2 General design
12 Monitoring and control
13 Laboratory analysis
14 Auxiliary facilitates
14.1 Chemical dosing house
14.2 Laboratory
14.3 Others
Explanation of wording in this code
List of quoted standards
