When you are working with concrete, it is important that you make sure that the slurry is disposed of safely. Concrete slurry can be quite harmful to the environment, so it is important that it is processed in a way that ensures the silica dust does not get dispersed in to the environment.
The majority of concrete slurry is water, and in the ideal world we would retrieve that water, and treat it so that it can be re-used. This can be done by filtering the dust out of the slurry, and draining the water out. It is important to reduce the pH of the water as well so that it is neutral and safe. Water separation is not a requirement for safe slurry disposal – as long as the dust is not allowed to make it into our waterways – but it is good practice. The solid, dry slurry is legal and in compliance with EPA standards. Dry slurry can be taken to landfill assuming that it is free from toxins – which most are. There are some concerns that certain forms of solid slurry are not safe – because they contain toxins that may leach into the environment. Some landfills will ask to take a sample of the solid slurry to use for chemical analysis to confirm whether it is safe, and then will tell you what you can do with it after checking the chemical makeup. If you solidify a slurry with a product that contains heavy metals, then this could be a problem for you. Dealing with concrete slurry can be a complex issue, but using a separator instead of a solidifying agent is a practical and easy solution that will allow you to manage the slurry safely and efficiently on site.