How to deal with unqualified plastic track? The following are several methods of treatment and analysis:
Remove or Replace
The most thorough method, removing sources of harmful substances, but causing serious economic losses.
Natural Dissipative Degradation
Harmful substances are dissipated and degraded in the natural state and eventually meet the requirements for harmful substances. In the process of natural dissipation, the site needs to be isolated and guaranteed not to contaminate other non-isolated areas. The time required by this method may be longer, and whether the hazardous substances can be reduced to the standards that meet the pest content requirements is not known, and it is not applicable to harmful substances that cannot be naturally dissipated or naturally dissipate for a long time.
By heating, it accelerates the dissipation of harmful substances in the surface layer. Experiments have proved that no matter whether it is hot air heating or steam blowing, it does not work very much for a short time, and it is difficult to implement long-time heat treatment in large outdoor areas, and the effect of long-time heat treatment is difficult to verify. Therefore, this method does not apply to outdoor sports venues.
Paving Activated Carbon
Use activated carbon to adsorb harmful substances. This method, in principle, can only absorb harmful substances emitted, can reduce the concentration of harmful substances in the air of unqualified sports grounds, but can not eradicate the harmful substances in the surface layer, and the rainwater can cause activated carbon to fail. It may take a long time for some harmful substances to dissipate, and it is not suitable to make activated carbon for a long time. Therefore, this method does not apply to outdoor sports venues.
Pave One More Layer
A layer of polymer seal or a layer of qualified surface shall be paved on the defective surface. This method does not guarantee that the polymer sealing layer can completely seal the underlying source of pollution, not to mention whether the construction is feasible, whether it will affect the quality of the synthetic material surface layer, and in the long term, the sealing effect is likely to fail. Therefore, it is not only an extra-pave but it should also be after demolition.
The method of dismantling should be adopted cautiously since it is economically wasteful. However, if necessary, demolition measures should be taken firmly to prevent future accidents.
In the case of heavy metals, polycyclic aromatic hydrocarbons, benzo [a] pyrene, short-chain chlorinated paraffins, phthalates, MOCA exceeding the standard, due to its great harm and difficult to degrade, the synthetic material surface layer should be removed.
For the granule filled in artificial turf exceeding the standard, the industrial dust collector can be used to suck off the unqualified granules and completely replace with qualified filling granules.
Other volatile and harmful substances may dissipate and degrade over time. To avoid unnecessary economic losses caused by the demolition, if the violation is not serious, a certain period of grace may be granted, but the period cannot be too long. In the absence of acceptance, the site should be closed and not used, and effective measures must be taken to ensure that the isolated area will not contaminate other non-isolated areas. If the severity exceeds the limit, it will not be possible to dissipate the degradation within the grace period and it shall be immediately dismantled or replaced.
(Source: Shenzhen "Synthetic Materials Sports Ground Quality Control Standard")