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HJ 353-2019

Chinese Standard: 'HJ 353-2019'
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BASIC DATA
Standard ID HJ 353-2019 (HJ353-2019)
Description (Translated English) Technical specification for installation of wastewater on-line monitoring system (CODCr, NH3-N et al.)
Sector / Industry Environmental Protection Industry Standard
Word Count Estimation 36,336
Date of Issue 12/24/2019
Date of Implementation 3/24/2020
Older Standard (superseded by this standard) HJ/T 353-2007
Drafting Organization China National Environmental Monitoring Station
Administrative Organization Ministry of Ecology and Environment

HJ 353-2019
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 353-2007
Technical specification for installation of wastewater
on-line monitoring system (CODCr, NH3-N et al.)
水污染源在线监测系统(CODCr, NH3-N等)安装技术规范
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: MARCH 24, 2020
Issued by: Ministry of Ecology and Environment
Table of Contents
Foreword ... 3 
1 Scope of application ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 7 
4 Composition of wastewater on-line monitoring system ... 8 
5 Construction requirements ... 9 
6 Installation requirements for wastewater on-line monitoring equipment ... 13 
7 Debugging requirements ... 16 
8 Requirements for trial operation ... 19 
Annex A (normative) Determination of TOC and CODCr conversion coefficients
... 22 
Annex B (informative) Monitoring station room layout ... 27 
Annex C (informative) Statistics of wastewater on-line monitoring system ... 29 
Annex D (informative) Installation specifications on standard metering weir
(flume) ... 32 
Annex E (informative) Enterprise sewage and wastewater on-line monitoring
equipment situation ... 45 
Annex F (informative) Debugging report of wastewater on-line monitoring
equipment ... 47 
Annex G (informative) Trail operation report of wastewater on-line monitoring
system ... 51 
Technical specification for installation of wastewater
on-line monitoring system (CODCr, NH3-N et al.)
1 Scope of application
This Standard specifies the composition of wastewater on-line monitoring
system, construction requirements for wastewater discharge outlets, flow
monitoring units, monitoring stations, automatic water quality sampling units
and data control units, installation requirements for flow meter, automatic water
quality sampler and automatic water quality analyzer, as well as technical
requirements for debugging and trial operation of wastewater on-line monitoring
system.
This Standard is applicable to the construction of components of wastewater
on-line monitoring system (CODCr, NH3-N et al.), as well as the installation,
debugging and trial operation of wastewater on-line monitoring equipment such
as used flow meter, water quality automatic sampler, chemical oxygen demand
(CODCr) automatic water quality analyzer, total organic carbon (TOC) automatic
water quality analyzer, ammonia nitrogen (NH3-N) automatic water quality
analyzer, total phosphorus (TP) water quality automatic analysis Meter, total
nitrogen (TN) automatic water quality analyzer, thermometer, pH automatic
water quality analyzer.
The wastewater on-line monitoring system (CODCr, NH3-N et al.) standardized
in this Standard is applicable to the on-line monitoring of chemical oxygen
demand (CODCr), ammonia nitrogen (NH3-N), total phosphorus (TP), total
nitrogen (TN), pH, temperature and flow monitoring factors.
2 Normative references
The following documents contain the provisions which, through reference in this
Standard, become the provisions of this Standard. For undated reference
documents, the latest versions apply to this Standard.
GB 15562.1, Graphical signs for environmental protection - Discharge outlet
(source)
GB 50057, Design Code for Protection of Structures against Lightning
GB 50093, Code for construction and quality acceptance of automation
instrumentation engineering
GB 50168, Standard for construction and acceptance of cable line electric
equipment installation engineering
GB 50169, Code for construction and acceptance of grounding connection
electric equipment installation engineering
GB/T 17214, Industrial-process measurement and control equipment -
Operating conditions
HJ 15, Technical specifications and test procedures for ultrasonic open
channel sewage flowmeter
HJ 91.1, Technical specifications for wastewater monitoring
HJ 101, Technical specifications and test procedures for water quality on-line
automatic monitoring equipment of ammonia
HJ 212, Data transmission standard for on-line monitoring systems of
pollutant
HJ 354-2019, Technical specification for check and acceptance of
wastewater on-line monitoring system (CODCr, NH3-N et al.)
HJ 355-2019, Technical specification for operation of wastewater on-line
monitoring system (CODCr, NH3-N et al.)
HJ 377, Technical specifications and test procedures for water quality on-line
automatic monitoring equipment of chemical oxygen demand (CODCr)
HJ 477, The Technical Requirement for Data Acquisition and Transmission
Equipment of Pollution Emission Auto Monitoring System
HJ 828, Water quality - Determination of the chemical oxygen demand-
Dichromate method
HJ/T 70, High-chlorine wastewater - Determination of chemical oxygen
demand - Chlorine emendation method
HJ/T 96, The technical requirement for automatic water quality analyzer of
PH
HJ/T 102, The technical requirement for automatic water quality analyzer of
total nitrogen
HJ/T 103, The technical requirement for automatic water quality analyzer of
total phosphorous
HJ/T 104, The technical requirement for automatic water quality analyzer of
total organic carbon
5.1.2 The discharge outlet shall be equipped with environmental protection
graphic signs in accordance with the requirements of GB 15562.1.
5.1.3 The discharge outlet shall be able to meet the construction requirements
of the flow monitoring unit.
5.1.4 The discharge outlet shall be able to meet the construction requirements
for automatic water sampling unit.
5.1.5 If it uses concealed pipes or underdrains for discharge, it shall need to set
up a shaft or build an open channel that can meet the manual sampling
conditions. If the sewage surface is above 1m below the ground level, it shall
be equipped with sampling steps or ladder frames. The pressure pipeline type
discharge port shall be equipped with a sampling valve that meets the
conditions of manual sampling.
5.2 Flow monitoring unit
5.2.1 It needs to measure the sewage unit of flow. According to the terrain and
drainage method as well as the amount of drainage, it shall, at the position
where the upstream of its discharge outlet can contain all sewage beams,
construct a flow measurement section of special channel (pipe), so as to meet
the requirements of measuring flow and velocity.
5.2.2 Generally, it can install standardized measuring weirs (flumes) such as
triangular thin-wall weirs, rectangular thin-wall weirs, and Parshall flume.
5.2.3 The construction of standardized metering weirs (flumes) shall be able to
remove deposits near the weir plate and compare open channel flowmeters.
5.2.4 The construction of pipe flowmeter shall make that: there shall be
sufficient length and space around the pipeline to meet the metering verification
and manual comparison of pipeline flowmeters.
5.3 Monitoring station room
5.3.1 There shall be a dedicated monitoring station room. The area of the newly-
built monitoring station room shall meet the functional needs of different
monitoring station room and ensure the placement, operation and maintenance
of the wastewater on-line monitoring system. The use area shall not be less
than 15m2, and the height of the station building shall not be less than 2.8m.
See Annex B for the recommended scheme.
5.3.2 The monitoring station room shall be as close as possible to the sampling
point. The distance from the sampling point shall be less than 50m.
5.3.3 It shall install air-conditioning and winter heating equipment. The air
conditioner has self-starting function of incoming power. It shall have a thermo-
5.4.5 The automatic water sampling unit shall set manual comparison sampling
port for composite sample.
5.4.6 The pipeline of automatic water sampling unit shall be set as open pipeline
and mark the direction of water flow.
5.4.7 The automatic water sampling unit shall use high-quality polyvinyl chloride
(PVC), tripropylene polypropylene (PPR) and other rigid pipes that do not affect
the analysis result.
5.4.8 When using an open channel flow meter to measure the flow, the water
inlet of automatic water sampling unit shall be set in front of the weir, and the
place where it shall be fully mixed after confluence. Try to be located in the
center of the flow path at the head of the water inlet of the standardized
metering weir (flume) of the flow monitoring unit. The direction of the water inlet
is consistent with the direction of the water flow to reduce the front-end clogging
of water inlet. The water sampling device shall be arranged in a form that can
move up and down with the fluctuation of the water surface.
5.4.9 The sampling pump shall be reasonably selected according to the
sampling flow rate, the head loss of the automatic water sampling unit and the
water level difference. It shall use the sampling pumps that have a long service
life, are easy to maintain and have no effect on water quality parameters. The
installation location shall facilitate the maintenance of the sampling pump.
5.5 Data control unit
5.5.1 The data control unit can coordinate and operate the wastewater on-line
monitoring system. Collect, store and display monitoring data and running
record, and upload pollution source monitoring data to the monitoring center
platform. The specific schematic is shown in Figure 2.
5.5.2 The data control unit can control the sampling, sending and retaining of
the automatic water sampling unit.
5.5.3 The data control unit triggers wastewater on-line monitoring equipment to
perform operations such as measurement, standard solution verification and
calibration.
5.5.4 The data control unit reads the measurement data of each wastewater
on-line monitoring equipment, realizes the query and display of real-time data,
hourly average and daily average values and uploads to the monitoring center
platform through the data acquisition and transmission instrument.
5.5.5 The data control unit records and uploads the monitoring data of
wastewater. The reported data shall be marked with time and data state
identifiers. Refer to sub-clause 6.2 in HJ 355-2019 for details.
suitable on-site working range of automatic water quality analyzer. See sub-
clause 5.1 in HJ 355-2019 for specific setting method.
6.5.2 The automatic water quality analyzer that is equipped with high-
temperature heating device shall avoid combustibles and places where
fireworks are strictly prohibited.
6.5.3 The cable connection between the automatic water quality analyzer and
the data control system shall be reliable and stable. Try to minimize signal
transmission distance and reduce signal loss.
6.5.4 The high-pressure gas cylinders necessary for the operation of automatic
water quality analyzer shall be firmly fixed to prevent the cylinders from falling.
If conditions permit, it can set up cylinder rooms.
6.5.5 The CODCr, TOC, NH3-N, TP, TN automatic water quality analyzer can
automatically adjust the zero point and calibration range value. The interval
between two calibrations is not less than 24h.
6.5.6 According to the actual situation of wastewater discharged by enterprises,
the automatic water quality analyzer can be installed with pretreatment devices
such as filtration device. The pre-treatment equipment such as filtration device
installed in the pre-treatment equipment shall prevent excessive filtration. The
comparison results of the actual water samples after filtering meet the
requirements of Table 3.
7 Debugging requirements
7.1 Basic requirements
7.1.1 After the construction of wastewater on-line monitoring system, it needs
to debug flowmeter, automatic water quality sampler, automatic water quality
analyzer, and report data in parallel on the Internet.
7.1.2 The display result of the data control unit shall be consistent with the
measuring instrument, so as to make easy access to various reports specified
in this Standard.
7.1.3 The open channel flowmeter adopts the method specified in 6.3 of HJ
354-2019 to conduct the flow comparison error test and the level comparison
error test.
7.1.4 The automatic water quality sampler adopts the method specified in 6.3
of HJ 354-2019 to conduct the sampling volume error test and the temperature
control error test.
Annex A
(normative)
Determination of TOC and CODCr conversion coefficients
A.1 Reagents
A.1.1 Experimental water
Obtain CO2-free distilled water according to HJ 104.
A.1.2 TOC standard stock solution
Ρ=2000.0mg/L
Related standard:   HJ 471-2020  HJ 519-2020
   
 
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