![]() Activity of SRB and MPB are optimum at COD/S ratio 2:1Lead removal efficiency observed was around 80-85%Gas production was optimum at ratio of 2:1Also the optimum pH observed was around 7.5-8. Chemical precipitation is one of the commonly employed and conventional processes in industry. If metals are present in the water to be treated, biological treatment has the advantage of being able to remove them along with sulfate via metal sulfide precipitation.The results of the application of a sequential extraction partitioning procedure indicated that an important part of the lead content is carried by the residual phase and also a significant percentage of lead in the organic and reducible fraction represents the bio-availability of lead. This paper reviews the disparate areas of study into metal sulphide precipitation in an attempt to summarise the current work, as well as to suggest potential. what colour does a precipitate have Precipitates have different colours. (2002) developed an equilibrium model for describing the relationships between important parameters for lead sorption by algae, which was derived through a thermodynamics approach. Therefore, this study was conducted to evaluate metal-sulfide precipitation chemistry as an alternative to metal-hydroxide precipitation chemistry for removing. Chemical precipitation is a chemical reaction or process in which soluble ions (such as soluble heavy metal ions or soluble phosphate ions) are converted to. CdS SnS 2 BaCrO 4 is a yellow precipitate. AIS and AAS are categorised on the basis of metals absorbed or adsorbed on the biomass.Mg and Al are not removedHeavy metals from the sludge can be removed by HCl, 8% phosphoric acid with hydrogen peroxide. ![]() Lower the organic content lower the efficiency of sulphate reductionMeans if high sulphate content is there and high COD content is there COD/SO42- ratio could be less.Organic substrate act as electron donor and sulphate act as electron acceptor and hence gets reduced to sulphideResulting in formation of sulphidesAlso hydroxide precipitation wl increase the pH of sewage which wl affect the functioning of UASB.
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