Study On Indoor Formaldehyde Emission Characteristics Of Newly Decorated Residential Buildings And Comparison Of Two Standards

At present,the domestic indoor environmental testing institutions generally carry out testing in accordance with the two standards of GB50325-2020《standard for indoor environmental pollution control of civil building engineering》(standard A)and GB/T18883-2002《indoor air quality standard》(standard B).However,due to the different operation steps of the two standards,the final error between standard A and standard B is very large.In view of the above problems,a problem survey program was designed in this work and the indoor formaldehyde emission characteristic experiments and the pollution treatment experiments were carried out combining the collected information from the problem survey and the background of the topic.Finally the improvement strategy was proposed for above problems.The main contents are as follows:Two newly decorated houses,house A with environmental protection grade of building materials and furniture E1 and house B with environmental protection grade of building materials and furniture E0,were selected as the research samples for a six-month formaldehyde concentration tracking test.The indoor formaldehyde concentration still exceeded the standard limit value of standard a in the 0?3 months,including the living room of house B The indoor formaldehyde concentration of the bedroom is 0.075 mg/m~3and 0.080 mg/m~3.Respectively after the indoor doors and windows are closed for 1 hour in the6th month after the soft furniture is mobilized.The formaldehyde concentration in the indoor air of the living room and the bedroom increases rapidly within 0?6 hours after the doors and windows of the"hardbound repair room"and the"hardbound repair room"after the mobilization of furniture and soft decoration only through the basic decoration project are closed.The formaldehyde concentration value is relatively stable within 6?18 h after the doors and windows of the house are closed,and increases slightly with the passage of time.However,the indoor formaldehyde concentration still does not reach the theoretical saturation value at the 18th h after the doors and windows are closed.In this"hardbound repair room"test,the limit value specified in standard A is46%higher than the limit value of formaldehyde concentration in standard B under the same sampling conditions.In the sample room experiment,the limit value of standard A is 55%higher than that of standard B under the same sampling conditions.Based on the conclusions of this experiment,the following suggestions are put forward for the two indoor formaldehyde control standards:it is suggested that during the future revision of standard A,the sampling points in the house after the mobilization of household and soft decoration should be appropriately increased,the number of sampling inspection in the rough room should be appropriately reduced,and the time for closing doors and windows should be appropriately increased.;It is suggested that formaldehyde sampling should be carried out after 6 hours for the closed doors and windows of the single room with the B standard within 50 m~2.The comparison and analysis of several common formaldehyde removal methods(active carbon method,ventilation method and plant method)in the hardbound repair room which has only undergone the basic decoration project show that the removal rate of indoor formaldehyde is in the order of:ventilation method>active carbon method>Green pineapple plant.