We have located links that may give you full text access.
Effect of initial pH and pH-adjusted acid on nutrient recovery from hydrolysis urine by combining acidification with evaporation-crystallization.
Environmental Science and Pollution Research International 2017 Februrary
Nutrient recovery from human urine is a promising pretreatment of domestic wastewater and provides a sustainable recyclability of nitrogen (N), phosphorus (P), and potassium (K). In this study, we present a method to recover all nutrients from hydrolysis urine (HU) in the form of solid products by combining acidification with evaporation-crystallization. The effect of initial pH (pHinit.) on N retention was investigated, and the optimal pHinit. was further determined by analysis of N retention efficiency. Additionally, crystallization process and product composition based on different pH-adjusted acids were also compared. The results revealed that pHinit. of HU was the key factor for N retention, and the optimal pHinit. was 4. In addition, compared with HCl and H2SO4, acidification by H3PO4 could effectively reduce energy consumption and improve nutrient content in urine-derived solid products (UDSPs) but increase the acid consumption. The major compositions (mass percentage, %) in UDSPs-Cl, UDSPs-S, and UDSPs-P were salammoniac (80%), lecontite (41%) and ammonium nitrate sulfate (30%), and biphosphammite (84%), respectively. The results also demonstrated that the method of mixing of UDSPs-Cl/UDSPs-S and UDSPs-P and addition of fillers such as calcite, ground limestone, or ground dolomite into them is suitable for improving nutrient balance and fertilizer efficiency.
Full text links
Related Resources
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app