Online monitoring method and device for sludge-dewatering-technology ammonia and hydrogen sulfide

Abstract

The invention discloses an online monitoring method and device for sludge-dewatering-technology ammonia (NH3) and hydrogen sulfide (H2S). The device comprises a ventilation system, a dewatering system, an on-line monitoring system and a tail gas absorption system. Online monitoring of the concentrations of the NH3 and the H2S which are generated in the sludge dewatering technology can be carried out, and the discharging amount of NH3 and H2S in the sludge dewatering technology can be accurately measured. The online monitoring method can provide a technical support for measuring the dischargingcharacteristics of the sludge-dewatering-technology NH3 and H2S and controlling malodorous gas in the process.

Description

technical field [0001] The invention relates to online monitoring of sludge dewatering process NH 3 and H 2 The method and device of S belong to the technical field of environmental monitoring. Background technique [0002] As of the end of September 2016, a total of 3,976 sewage treatment plants have been built nationwide, with a sewage treatment capacity of 170 million cubic meters per day. As a by-product of sewage, the amount of sludge produced reaches 40 million tons per year (water content 80%), and grows rapidly at an average rate of 13% per year. Dewatered sludge is generally divided into mixed sludge (a mixture of primary sedimentation tank sludge and residual sludge) and anaerobic digested sludge. These sludges will produce a large amount of malodorous gas during the dehydration process, which may cause sensory discomfort to the staff of the sewage treatment plant and surrounding residents and even affect their health, causing serious environmental problems. ...

AI Technical Summary

Problems solved by technology

Existing related research work mainly focuses on the concentration monitoring of open space gas and gas collection in a closed environment, and the monitoring of gas concentration in open space cannot realize the determination of gas emission

[0005] Patent CN106501492A reports a method for reducing the spatial variation and environmental disturbance error of farmland ammonia volatilization by the static box method. This method is mainly used for the monitoring of farmland ammonia volatilization, and cannot provide real-time online ammonia changes.

[0006] Patent CN206095725U and patent CN105699134A report a collection device for collecting greenhouse gases from farmland crops. This method is mainly used to collect greenhouse gases from farmland crops, and the concentration and change of greenhouse gases cannot be given online in real time

[0007] Patent CN104007184A reports a method for measuring the emission of sulfur-containing gases in wetland ecosystems. The measurement method is mainly used for the emission of sulfur-containing gases in wetland ecosystems, and the concentration and change of sulfur-containing gases cannot be given online in real time

[0008] Patent CN106405055A reports a continuous online measurement of soil CO 2 Flux system and method, this method is mainly used for soil CO 2 On-line monitoring of flux cannot be used for on-line determination of emission characteristics of malodorous gases in sludge dewatering process

[0009] Patent CN106290207A reports an open optical program malodorous gas monitoring and traceability device and method, which cannot determine the emission of malodorous gas

[0010] Patent CN106254089A reports an online odor monitoring platform based on RDP encryption technology, including a data transmission management module, a remote device management module and a database management module, which can realize the monitoring of odorous gases in remote open ambient air. This method cannot determine the odorous gases emissions and its application in sludge dewatering process

[0011] Patent CN103076374A and patent CN102539508A report the monitoring device and method for the distribution of odor concentration around the pig house, which can realize the multi-point monitoring of the odor concentration outside the pig house at the same time, and can be used to monitor the concentration distribution of odor gas in the open environment air , this method cannot determine the emission of malodorous gas and its application in sludge dewatering process

[0012] Patent CN103175781A reports an online area-distributed odor monitoring system and method. The system includes a control center and online odor monitors installed at multiple monitoring stations, which can effectively monitor the odor pollution status in polluted areas in real time and realize regional comprehensive Analysis, the device can be used to monitor the concentration distribution of malodorous gas in open ambient air, this method cannot determine the emission of malodorous gas and its application in sludge dewatering process

[0013] Generally speaking, according to the reported collection devices and monitoring methods for malodorous gases, there is still a lack of online monitoring methods and devices for odor emissions from sludge dewatering processes. Sure

Images