HJ 354-2019Technical specification for check and acceptance of wastewater on-line monitoring system (CODCr, NH3-N et al.) (English PDF)

4.1 Acceptance conditions

4.1.1 Provide relevant technical information on the type selection, engineering

design, construction, installation and commissioning, performance of the wastewater online monitoring system.

4.1.5 The automatic water sampling unit has been running stably for one month.

It can collect instantaneous samples and representative composite samples for the analysis of the wastewater online monitoring instruments. It may retain samples and alarm.

4.1.6 The power supply is uninterrupted during the acceptance process.

4.1.7 The data control unit has been operating stably for one month, sending data to the monitoring center platform in time, during which the equipment operation rate shall be greater than 90%; the data transmission rate shall be greater than 90%.

4.2 Acceptance contents

After the wastewater online monitoring system is installed, commissioned, and test run, and connected to the environmental protection authority, it shall undergo construction acceptance, instrument and equipment acceptance, network acceptance, operation and maintenance program acceptance.

5.1 Pollution source discharge outlet

5.1.1 The layout of pollution source discharge outlets meets the requirements

of HJ 91.1.

5.2 Flow monitoring unit

5.2.1 The dredging work platform is provided at the rear end of the triangular weir and the rectangular weir, which can facilitate the removal of deposits at the rear end of the weir trough.

5.2.2 There is a working platform for the inspection and comparison of ultrasonic probes at the installation place of the flowmeter, which can facilitate the maintenance and comparison of the flowmeter.

5.2.5 The installation of protective railings shall all meet the requirements.

5.3 Monitoring station building

5.3.1 The monitoring station building has its all rooms dedicated for special purposes.

5.4 Automatic water sampling unit

5.4.1 Realize the functions of collecting instantaneous samples and composite

samples, mixing and temporarily storing water samples, automatic washing and emptying of the mixing bucket.

5.4.2 Realize the function of retaining composite samples and instantaneous

samples.

5.4.3 Realize in-situ measurement of pH automatic water analyzer, thermometer or the measurement of instantaneous sample.

5.4.4 CODCr, TOC, NH3-N, TP, TN automatic water analyzer measures the

composite sample.

5.4.5 The necessary anti-freezing or anti-corrosion facilities shall be provided.

5.4.6 Set artificial comparison sampling port for composite samples.

5.4.7 The pipes of the automatic water sampling unit are open pipes, marked with water flow direction.

5.5 Data control unit

5.5.1 The data control unit can coordinate and operate the wastewater online monitoring system; collect, store, and display monitoring data and running daily records; upload the wastewater monitoring data to the monitoring center platform.

6.1 Basic acceptance requirements

6.1.1 The various cables and pipes of the wastewater online monitoring

instrument shall be protected by pipes laid in the ground or erected in the air.

The cables erected in the air shall be attached to a solid bridge frame; the cables, pipes, as well as both ends of the cables, pipes are clearly marked. The construction of cable lines shall meet the relevant requirements of GB/T 50168.

6.2 Functional acceptance requirements

6.2.1 It has time setting, proofreading and display functions.

6.2.4 It shall be possible to set a three-level system login password and corresponding operation authority.

6.2.7 It shall have limit alarm and alarm signal output functions.

6.2.8 It shall have the functions of receiving external trigger commands from remote control network and starting analysis.

6.3 Performance acceptance method

7.1 Communication stability

The communication between the data control unit and the monitoring center platform is stable; there shall be no communication problems such as frequent communication interruption, data loss, incomplete data.

7.2 Data transmission security

In order to ensure the security of monitoring data transmission on the public data network, the data acquisition and transmission instrument used can follow the encryption method as specified in HJ 212 to encrypt and process the transmission, to guarantee the security of data transmission. One end requests a connection and the other end shall authenticate.

7.3 Correctness of communication protocol

The communication protocol used shall fully comply with the relevant requirements of HJ 212.

7.5 Network stability

Within a continuous month, the system can run stably without any other connecting-network problems except communication stability, correctness of communication protocols, correctness of data transmission.

7.6 Requirements for field failure simulation recovery test

During the on-site acceptance of the automatic wastewater online continuous monitoring system, artificially simulate the failures such as on-site power failure, water and gas outages.

7.7 Measurement frequency and measurement result report

It can automatically generate daily statistics, monthly statistics and annual statistics according to the requirements. For the report format, refer to Appendix

C of HJ 353-2019.