CEM 2020

CEM - Abstract

Abstract Title: Measurements at low concentrations - Intercomparison measurements at Waste to Energy plant
Abstract Type: Oral
Session Choice: Gaseous species at low concentrations (HCl, HF, NH3, SO3, CH4, N2O, CHOH, TOC)
Presenter Name: Mrs Tuula Kajolinna
Co-authors:Ms Tuula Pellikka
Company/Organisation: VTT Technical Research Centre of Finland
Country: Finland

Abstract Information :

Intercomparison measurements by eight accredited emission measurement laboratories were performed in May 2019 in Finland during two weeks. The measurement place was in waste to energy plant which incinerates municipal waste in their grate furnace. Due to the limited number of measurement ports, four laboratories were able to measure simultaneously. During the measurement campaign the concentrations of gases (SO2, CO, CO2, O2, NOx, TVOC, HCl, HF, H2O), dust, heavy metals and PCDD/F were measured. This presentation focuses on the results of SO2, CO, TVOC, HCl, HF and dust and their measurement uncertainties.

Reported SO2 results were between 2.2 and 18 mg/m3 with standard deviation (stdev) of 6.7 mg/m3. Two laboratories reported their SO2 results to be below LOQ (limit of quantification) which were 1 and 14 mg/m3. CO results varied between 2 and 18 mg/m3 with stdev of 3.0 mg/m3. TVOC results were between 0.1 and 13 mg/m3 with stdev of 6.2 mg/m3. Two laboratories reported their TVOC results to be below LOQ which were 0.05 and 1.5 mg/m3. Reported HCl results and their LOQs were less than 0.6 mg/m3. All reported HF results were below LOQ of 0.2 mg/m3. Reported dust results were between 0.1 and 0.4 mg/m3. Four laboratories reported their dust results to be below their LOQ-values which were 0.1, 0.2, 0.5 and 1 mg/m3.

BAT-AELs of WI-BREF for existing plants are as follows: SO2 5-40 mg/m3, CO 10-50 mg/m3 and TVOC <3-10 mg/m3, HCl <2-8 mg/m3, HF <1 mg/m3 and dust <2-5 mg/m3. Averaging period for all components are given as daily averages, expressed in standard conditions and 11 % oxygen.

It can be seen that especially TVOC and SO2 results and their LOQs vary a lot. For example, LOQ value for SO2 was expressed by one laboratory to be 14 mg/m3 which is higher than the lower level of BAT-AEL.

As a conclusion it can be said related to these intercomparison measurements that all measured results were at low level. Reported LOQs as well as measured concentrations, however, varied between different laboratories.