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HJ 355-2019: Technical specification for operation of wastewater on-line monitoring system (CODCr, NH3-N et al.)
HJ 355-2019
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing HJ/T 355-2007
Technical specification for operation of wastewater
on-line monitoring system (CODCr, NH3-N et al.)
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: MARCH 24, 2020
Issued by: Ministry of Ecology and Environment
Table of Contents
Foreword ... 4 
1 Scope of application ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Operating organization and personnel ... 8 
5 Management and setting of instrument operating parameters ... 9 
6 Requirements for sampling methods and data reporting ... 10 
7 Requirements for inspection and maintenance ... 11 
8 Operational technical and quality control requirements ... 14 
9 Maintenance and troubleshooting requirements ... 20 
10 Operational comparison monitoring requirements ... 21 
11 Operating archives and records... 22 
Annex A (informative) Basic situation of wastewater on-line monitoring system
... 24 
Annex B (informative) Routine inspection and maintenance record form ... 25 
Annex C (informative) Parameter setting record table of wastewater on-line
monitoring equipment ... 28 
Annex D (informative) Record table of standard verification and calibration
results ... 30 
Annex E (informative) Inspection and maintenance record form ... 31 
Annex F (informative) Consumable replacement record form ... 33 
Annex G (informative) Standard sample replacement record form ... 34 
Annex H (informative) Record table of actual water-sample comparison test
results ... 35 
Annex I (informative) Operation comparison monitoring report of wastewater
on-line monitoring system ... 36 
Annex J (informative) Operation checklist ... 41 
Technical specification for operation of wastewater
on-line monitoring system (CODCr, NH3-N et al.)
1 Scope of application
This Standard specifies the requirements for the operating organization and
personnel, parameter management and setting, sampling methods and data
reporting, inspection and maintenance, operation technical and quality control,
system maintenance and troubleshooting, archive records that the operating
organization shall meet, so as to ensure the stable operation of on-line
monitoring equipment for wastewater. It also specifies the specific content of
operation comparison monitoring.
This Standard is applicable to the operation of wastewater on-line monitoring
equipment such as various components of the wastewater on-line monitoring
system that has been accepted by HJ 354 and the flow meter, automatic water-
quality sampler, chemical oxygen demand (CODCr) water automatic analyzer,
total organic carbon (TOC) water automatic analyzer, ammonia nitrogen (NH3-
N) water automatic analyzer, total phosphorus (TP) water automatic analyzer,
total nitrogen (TN) water automatic analyzer, thermometer, pH water automatic
analyzer. This Standard is applicable to the daily operation and management of
operating organization of wastewater on-line monitoring system.
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/T 6920, Water-quality - Determination of pH Value - Glass Electrode
Method
GB/T 11893, Water-quality - Determination of total phosphorus - Ammonium
molybdate spectrophotometric method
GB/T 13195, Water-quality. Determination of water temperature.
Thermometer or reversing thermometer method
GB 18597, Standard for pollution control on hazardous waste storage
HJ 15, Technical specifications and test procedures for ultrasonic open
emissions.
3.3 instantaneous sample
The water-sample that is collected at one time at a sampling point.
3.4 composite sample
A mixture of water-samples that are collected at a same sampling point
continuously or at different times.
3.5 automatic water sampling system
A system in wastewater on-line monitoring system that is used to collect the
instantaneous sample and the composite sample, for over-standard sample
retention, to parallelly monitor sample retention, to compare monitoring sample
retention. It is used for the wastewater on-line monitoring equipment to analyze
and test.
3.6 on-line monitoring equipment operating parameters
Relative parameters that are set on the wastewater on-line monitoring
equipment installed on site, that can characterize the measurement process
and have influence on the measurement results.
3.7 data availability
In a certain period, the ratio of the number of valid data actually obtained by the
instrument to the number of valid data that shall be obtained in the period.
3.8 maintenance state
The state of wastewater on-line monitoring system when it is performing
maintenance operation during abnormal sampling monitoring period, including
instrument maintenance, overhaul, calibration, and maintenance of automatic
water sampling system.
3.9 auto-check with standard solution
The accuracy of wastewater on-line monitoring equipment to automatically
measure standard solution and automatically determine the measurement
results.
4 Operating organization and personnel
4.1 Requirements for operating organization
enabled.
6 Requirements for sampling methods and data
reporting
6.1 Sampling methods
6.1.1 Instantaneous sampling
Use pH water automatic analyzer, thermometer and flow meter to monitor the
instantaneous sample. During continuous discharging, obtain a monitored data
per 10min for pH value, temperature and flow. During intermittent discharge,
the amount of data is not less than 6 times the cumulative discharge hours of
sewage.
6.1.2 Composite sampling
Use CODCr, TOC, NH3-N, TP, TN water automatic analyzer to monitor the
composite sample.
During continuous discharging, start timing from 0’s clock every day. Every 1h
shall be a time period. The automatic water sampling system performs time
proportional or flow proportional sampling during this time period (for example,
conduct sampling every 15min and collect 4 times of water-samples within 1h
to ensure that the number of samples collected during this period meets the
requirements). Use water automatic analyzer to test the composite sample of
this time period. The test result shall be calculated as the average continuous
discharge concentration of wastewater of this time period.
During intermittent discharging, every 1h shall be a time period. The automatic
water sampling system performs time proportional or flow proportional sampling
during this time period (set according to the actual discharge amount on site to
ensure that water-samples can be collected during discharge). After sampling
ends, the water automatic analyzer shall test the composite sample of this time
period. The test result shall be calculated as the average discharge
concentration of wastewater of this time period. If the number of samples
collected during a sampling period cannot meet the needs of instrument
analysis, no data is processed for this period.
6.2 Data reporting
6.2.1 It shall ensure that the data acquisition and transmission instrument and
online monitoring equipment are consistent with the time of monitoring center
platform.
electrode filling solution is normal. Clean the electrode probe if necessary.
7.2.5 Check whether the standard solutions and reage...