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HJ 355-2019 (HJ355-2019)

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HJ 355-2019: PDF in English

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 reagents of each wastewater
on-line monitoring equipment are within the valid use period, so as to guarantee
regular replacement of standard solutions and reagents in accordance with
relevant requirements.
7.2.6 Check the operation of the data acquisition and transmission instrument
and inspect whether the joints are damaged. Conduct sampling inspection of
data Compare whether the data received by the wastewater on-line monitoring
equipment, data acquisition and transmission instrument, and monitoring center
platform are consistent.
7.2.7 Check whether the automatic water sampling system pipeline is clean,
whether the sampling pump, sampling barrel and sample retention system are
working properly, and whether the temperature of the sample retention and
storage is normal.
7.2.8 If gas cylinders are used at some stations, check whether the carrier gas
system is sealed and whether the air pressure meets the requirements for use.
7.3 Monthly inspection and maintenance
7.3.1 The monthly on-site maintenance shall include the maintenance of the
wastewater on-line monitoring equipment and the instrument analysis system.
Check the working state of the data storage or control system. Check the
grounding of the monitoring equipment. Check the lightning protection
measures of the monitoring station-room.
7.3.2 Wastewater on-line monitoring equipment: According to the
corresponding instrument operation and maintenance instructions, check and
maintain consumable parts; replace if necessary. Check and clean the sampling
units, digestion units, detection units and metering units.
7.3.3 Automatic water sampling system: Replace the peristaltic pump tube and
clean the mixed sampling bottle according to the situation.
7.3.4 TOC water-quality analyzer: Check if TOC-CODCr conversion factor is
applicable. Correct if necessary. Check the temperature of the pump, tube, and
furnace of the TOC water automatic analyzer once. Check the remaining
reagent amount (add or replace if necessary). Check the halogen scrubber,
condenser water-sealed container, humidifier, and add distilled water if
necessary.
7.3.5 pH water automatic analyzer: Use acid liquor to clean the electrode once.
Check if pH electrode is passivated. Calibrate or replace if necessary.
x -- Measured value of analyzer, mg/L.
8.2.1.2 If the automatic calibration and verification time of the on-line monitoring
equipment exceeds 6h, it shall take manual monitoring method to report data
to corresponding environmental protection authority. Data reporting is not less
than 4 times per day. The interval must not exceed 6h.
8.2.1.3 The maximum interval of auto-check with standard solution cycle must
not exceed 24h. The maximum interval between calibration cycles must not
exceed 168h.
8.2.2 Comparison test of actual water-samples
8.2.2.1 For CODCr, TOC, NH3-N, TP, TN water automatic analyzer, it shall carry
out the comparison test of actual water-samples at least once per month. The
test results shall meet the requirements for performance indicators in Table 1.
When the results of comparison test of actual water-samples cannot meet the
requirements for performance indicators in Table 1, it shall calibrate the
instrument and verify the standard solution first before conducting the
comparison test of actual water-samples.
8.2.2.2 If the comparison test results of actual water-samples of the second
time still fail to comply with the provisions of Table 1, the instrument shall enter
the maintenance state. At the same time, during the period from this
comparison test of actual water-samples to the previous automatic instrument
calibration or auto-check with standard solution (automatic instrument
calibration specified in 8.2.1), all data shall be in accordance with the relevant
provisions of HJ 356.
8.2.2.3 When the instrument maintenance time exceeds 6h, it shall take manual
monitoring method to report data to corresponding environmental protection
authority. Data reporting is not less than 4 times per day. The interval must not
exceed 6h.
8.2.2.4 According to the water-sample collection port specified in HJ 353, collect
actual wastewater discharge samples. Use water automatic analyzer and
national environmental monitoring and analysis method standard (see Table 2)
to respectively analyze the same water-sample. Two measurement results form
a measurement data pair. Obtain at least three measurement data pairs.
According to formula (2) or formula (3), calculate the absolute error or relative
error of comparison test of actual water-samples. The results shall comply with
the provisions of Table 1 in this Standard.
it shall rush to the site to deal with it within a specified time and eliminate the
fault. Install a backup instrument if it cannot handle timely.
9.4 After the wastewater on-line monitoring equipment is repaired, before
normal use and operation, it shall ensure that all repairs are completed and
passed calibration and comparison tests. If the on-line monitoring equipment is
replaced, before normal use and operation, it shall ensure that all its
performance indicators shall meet the requirements of Table 1 of this Standard.
A comparison test report can be issued for repaired and replaced instruments
by a third party or operating organization.
9.5 If the data acquisition transmission instrument fails, it shall be repaired or
replaced within the time specified by the corresponding environmental
protection management department, and it can ensure that the collected data
shall not be lost.
9.6 The operating organization shall have sufficient spare parts and spare
equipment. Check its usage regularly and make additional purchases according
to actual needs.
9.7 When the wastewater on-line monitoring equipment cannot work as normal
due to failure or maintenance reasons, it shall report to corresponding
environmental protection management department timely. When necessary,
use manual monitoring. The interval of monitoring cycle is not more than 6h.
Data reporting is not less than 4 times per day. Refer to HJ 91.1 for the
monitoring technical requirements.
10 Operational comparison monitoring requirements
10.1 Operation management
The operation management shall be carried out from parameter setting and
management, inspection and maintenance, auto-check with standard solution,
automatic calibration, comparison test, maintenance and troubleshooting,
comparison monitoring, records and archives. See Annex J for the operation
checklist.
10.2 Comparison monitoring requirements
10.2.1 Comparison monitoring test device
According to the comparison analysis items and HJ 493 requirements, conduct
daily cleaning, maintenance and organization of sampling apparatus required
for comparison test.
10.2.2 Sample collection and storage
......
(Above excerpt was released on 2020-02-09, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/HJ355-2019