Abstract
The paper is focused on the research of biochemical treatment of sewage sludge and phosphogypsum under sulphate-reducing conditions with a phosphorus release process. The theoretical foundations of the work were based on the biochemical formalization using the principles of autocatalysis of natural systems. During the experimental research for the control of physicochemical parameters of the process spectroquantic, X-ray fluorescence analysis and other techniques were used. A schematic model of the dephosphatation process under anaerobic stabilization of sewage sludge and phosphogypsum was developed. The increase of phosphogypsum dosage had a close correlation with the release of phosphate ions. At the stimulating action of the phosphogypsum additive, a 2.5–5.0-fold increase in soluble phosphate concentration was observed. The rational dose of phosphogypsum was determined. Along with an increase the ratio of COD (Chemical Oxygen Demand)/phosphogypsum to 0.1, an increase in the phosphate ions in solution was observed. A further increase in the ratio of COD/phosphogypsum did not affect the concentration of phosphate ions in solution.
Highlights
The complete phosphorus cycle in current human society is endangered because phosphorus is a non-renewable resource
X-ray fluorescence analysiswas wasused used to to describe of phosphogypsum used used in analysis describethe thecomposition composition of phosphogypsum in experiments with sewage sludge
The model sludge and phosphogypsum was developed, taking into account the process of returning part of of anaerobic phosphate release shows the impact of phosphogypsum on the development of the fermented substrate to the technological system and flocculation processes in the active sludge sulphate-reducing bacteria during the release process in the bioreactor space with indirect biomass
Summary
The complete phosphorus cycle in current human society is endangered because phosphorus is a non-renewable resource. With depletion of its reserves, it is necessary to develop sustainable techniques for its recover from solid and liquid waste. Due to the limited availability of phosphate rock, phosphorus recovery has attracted increasing interest from researchers. A proven technique to efficiently remove and recover phosphorus from phosphorus-rich streams is struvite precipitation [1,2,3]. The suitability of struvite precipitation for agricultural use is largely determined by the content of heavy metals and micropollutants [2]. The most widely used methods of P removal from wastewater are through biological means
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