Impact of Carbonate Hydroxylapatite (CHAP) Addition on Bio-Hydrogen Production from Microwave Pretreated Sludge

In order to promote the hydrolysis and disintegration of waste sludge, the most logical approach is pretreatments to disrupt the microbial cells of sludge. After microwave pretreatments, the heavy metal which were toxicity to H2 production were released from waste sludge, and the increase rate was 10.6 (Cu), 5.5(Cd), 3.6(Zn) and 1.6 (Ni) times after pretreatment. Carbonate hydroxylapatite (CHAP) had high efficiency in heavy metal removal. In this study, the effect of heavy metal removal on bio-hydrogen production from microwave pretreated sludge using CHAP was evaluated. 0.53 g/gVSS CHAP addition could enhance the bio-hydrogen yield by 53.6% compared with control, and the lag time was 9 h. Dosages of CHAP couldinfluence the hydrolysis, fermentation type and hydrogen yield of pretreated sludge.

Preparation and Characterization of Carbon Hydroxyapatite with Different Carbon Content

Carbonate hydroxylapatite (CHAP) with different carbon content synthesized by precipitation, As raw material to calcium nitrate、potassium phosphate、potassium carbonate, by changing the incorporation of potassium carbonate.The CHAP was characterized by XRD、TEM and FTIR. And through analysis compared structure and morphology of carbon hydroxyapatite with different carbon content.

Adsorption Study of Carbonate Hydroxylapatite for Hexavalent Chromium Ion from Aqueous Solution at Different Carbon Content

The adsorption of Cr6+ from aqueous solution by carbonate hydroxylapatite (CHAP) with different carbon content synthesized by precipitation. The CHAP was characterized and analyzed by TEM、FTIR and XRD. And adsorption was effected by the pH value、CHAP usage、adsorption time and other factors. The results show that under certain conditons, adsorption capacity enhanced with the carbon content increasing.