A sustainable barrier including a waste material and a binder is provided. The binder is mixed with the waste material and configured to bind the waste material into the sustainable barrier. The binder includes a catalyst configured to enable the binder to bind the waste material into the sustainable barrier.

Approximately 50,000 tons of sewage sludge are generated in Qatar every year as by-product from the treatment of municipal wastewater. The sewage sludge contains a wide range of contaminants, such as heavy metals, pathogens, and organic pollutants, and its disposal presents significant challenges due to its potential impact on human health and the environment. Thermally dried sludge pellets are only permitted for use in landscaping and their use is declining with time, with the majority sent to landfill. The government is considering the ban of sewage sludge landfilling due to the potential risks of accumulated contaminants. The present technology provides an innovative solution for the conversion of sewage sludge into cementitious material for use in the construction industry.

Compositions and methods are presented in which aragonite, and especially oolitic aragonite particles are used as infill material in an artificial turf structure or as sub-growth substrate for natural grass. Advantageously, oolitic aragonite particles provide: a superior microporous surface for effective water saturation to impart thermal control and environmental compatibility; ammonia neutralization of urine by reducing urea hydrolysis with the free calcium presented in the aragonite particles; and aragonite particle uniformity allowing for reduced compaction and desirable water draining.

The present invention is directed to a solidified composition and a method of making such solidified composition. The solidified composition may have a lower leachate pH when compared to ordinary Portland cement. The solidified composition may be formed from a slurry comprising magnesium oxide, a salt, and water. Notably, the solidified composition may further comprise one or more actinides. The methods of the present invention are directed to making the aforementioned solidified compositions.

A full solid-waste micro-expansive concrete and its preparation method are provided, and relate to the field of concrete material technologies. The full solid-waste micro-expansive concrete includes the following components in parts by weight: 920-1060 parts of a coarse aggregate, 460-582 parts of a fine aggregate, 11-19 parts of an expansive agent, 389-512 parts of a modified solid-waste-based cementitious material, and 231-268 parts of water. The coarse aggregate is coal gangue. The fine aggregate is waste ceramic. The modified solid-waste-based cementitious material includes a solid-waste-based clinker, modified polyvinyl alcohol, and a modified anion exchange resin. The solid-waste-based clinker is prepared from the coal gangue, carbide slag, and desulfurization gypsum. The expansive agent is obtained by calcining the carbide slag. The concrete prepared can ensure the initial strength of the concrete, and guarantee continuous micro-expansion in the later stage, compensating for shrinkage and thereby increasing the overall strength of the concrete.