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UDC 628.336.3

Drozd G. Ya., Bizirka I. I.

Commercialization of landfilled sludge

Summary

The problem of municipal and industrial wastewater sludge utilization is analyzed. The option of environmental utilization of sludge by its commercialization in building and agricultural sectors is considered. To provide for the wide use of the considered approaches the following is required: full expert consideration; development of engineering specifications for every product type; introduction of amendments and supplements into the regulatory and legal framework; development of valid mechanisms of implementing sludge utilization projects; development of ways of tax exemption of profit received from the sales of waste-derived products and receiving state aids for reducing interests on bank loans.

Key words

sludge , heavy metals , organics , sludge utilization , bitumen concrete , ceramics , fertilizers

DOI 10.35776/MNP.2020.06.08
UDC 628.169

Kofman V. Ya.

Water sludge: utilization in the production of construction materials and agriculture Alternative coagulants (a review)

Summary

Utilization of water sludge in significant amounts can be provided by using it in the production of construction materials and in agriculture. The use of water sludge in the construction industry can result in significant savings in traditional raw materials without compromising product quality. However, the supply of water sludge to the construction industry enterprises, has not been established so far, and the instability of its composition is posed as the main reason. At the same time, the results achieved evidence significant efforts made in this area. Based on the use of water sludge, technologies have been developed for the production of cement, building mortar, concrete, brick, roofing tiles, and ceramic products. Agricultural use of water sludge is considered as a most affordable and large-scale option of its disposal. The concentration of organics and heavy metals in water sludge is quite limited, which sets it apart from wastewater sludge and allows it being classified as safe. To date, in a number of countries many years of large-scale experiments have been conducted on the use of water sludge for adjusting the concentration of soluble phosphorus in soils; binding soluble forms of arsenic and chromium, and adjusting the concentration of trace elements. A radical solution to the problem of water sludge disposal should be associated with reducing its amount generated during water purification process. In this direction, studies are being conducted on alternative coagulants, primarily of plant origin. The results achieved made it possible to carry out pilot tests of using aqueous extract of Moringa oleifera oil-tree seeds as a coagulant in the purification of surface water.

Key words

ceramics , water sludge , brick manufacture , cement , building mortar , concrete , agriculture , soil amendment , alternative coagulants of plant origin , Moringa oleifera