Effects of EDTA on phosphorus release in excess sludge and phosphorus recovery by MAP
HU De-xiu, ZHANG Yan, Zhang Cong
National Demonstration Center for Experimental Water Resources and Hydro-electric Engineering Education, Xi'an University of Technology, Xi'an 710048, China
The effects of EDTA on phosphorus release from excess sludge during anaerobic digestion, and on the phosphorus recovery by magnesium ammonium phosphate (MAP) precipitation were investigated. The pretreatment condition was optimized by the variety of total phosphorus (TP), protein, polysaccharide, DNA and SCOD in sludge supernatant under different EDTA concentrations during anaerobic digestion process. Furthermore, the prediction model of MAP phosphorus recovery rate and MAP purity was set up by utilizing the response surface methodology (RSM). The results indicated that the optimum additive dosage of EDTA was 5mmol/L, and optimal anaerobic reaction time was 5d; DD had significant association with TP, DNA, protein and polysaccharide, in which the maximum correlation coefficients 0.866was between DD and TP; The optimal process parameters of MAP phosphorus recovery was: pH=9.5, n(Mg):n(P)=1.6, stirring time =22min, under this circumstance MAP phosphorus recovery rate was 95.68% and purity was 79.19%.
胡德秀, 张艳, 张聪. EDTA对剩余污泥磷释放及MAP法磷回收影响[J]. 中国环境科学, 2019, 39(4): 1611-1618.
HU De-xiu, ZHANG Yan, Zhang Cong. Effects of EDTA on phosphorus release in excess sludge and phosphorus recovery by MAP. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(4): 1611-1618.
Rittmann B E, Mayer B, Westerhoff P, et al. Capturing the lost phosphorus[J]. Chemosphere, 2011,84(6):846-853.
[2]
Zuthi M F, Guo W S, Ngo H H, et al. Enhanced biological phosphorus removal and its modeling for the activated sludge and membrane bioreactor processes[J]. Bioresource Technology, 2013,139(13):363-374.
[3]
Rahman M M, Salleh M A M, Rashid U, et al. Production of slow release crystal fertilizer from wastewaters through struvite crystallization-A review[J]. Arabian Journal of Chemistry, 2014,7(1):139-155.
[4]
吴健,平倩,李咏梅.鸟粪石结晶成粒技术回收污泥液中磷的中试研究[J]. 中国环境科学, 2017,37(3):941-947. Wu J, Ping Q, Li Y M. A pilot-scale study on struvite pellet crystallization for phosphorus recovery from sludge liquor[J]. China Environmental Science, 2017,37(3):941-947.
[5]
Li X Z, Zhao Q L. Recovery of ammonium-nitrogen from landfill leachate as a multi-nutrient fertilizer[J]. Ecological Engineering, 2003, 20(2):171-181.
[6]
Hu P, Liu J, Bao H, et al. Enhancing phosphorus release from waste activated sludge by combining high-voltage pulsed discharge pretreatment with anaerobic fermentation[J]. Journal of Cleaner Production, 2018,196(6):1044-1051.
[7]
Wang Y, Zhang T, Westerhoff P, et al. Microwave-assisted digestion and NaOH treatment of waste activated sludge to recover phosphorus by crystallizing struvite[J]. Environmental Technology Letters, 2016, 38(10):1-47.
[8]
Wu L, Zhang C, Hu H, et al. Phosphorus and short-chain fatty acids recovery from waste activated sludge by anaerobic fermentation:Effect of acid or alkali pretreatment[J]. Bioresource Technology, 2017,240(9):192-196.
[9]
韦林,洪天求,李如忠,等.海藻酸钠对鸟粪石结晶的影响机理研究[J]. 中国环境科学, 2017,37(8):2941-2946. Wei L, Hong T Q, Li R Z, et al. Effect and mechanism of sodium alginate on struvite crystallization[J]. China Environmental Science, 2017,37(8):2941-2946.
[10]
胡德秀,张艳,骆瑜,等.有机物对鸟粪石结晶法回收污水中磷的影响[J]. 中国给水排水, 2018,(3):1-6. Hu D X, Zhang Y, Luo Y, et al. Effect of organic matters on phosphorus recovery from wastewater by truvite crystallization method[J]. China Water & Wastewater, 2018,(3):1-6.
[11]
鄢恒珍,唐佳宾,刘国校.剩余污泥预处理方法研究现状概述[J]. 科技咨讯, 2015,5(15):97-98. Yan H Z, Tang J B, Liu G X. The current status of pretreatment methods for excess sludge[J]. Science & Technology Information, 2015,5(15):97-98.
[12]
Liu H, Xiao H, Yin B, et al. Enhanced volatile fatty acid production by a modified biological pretreatment in anaerobic fermentation of waste activated sludge[J]. Chemical Engineering Journal, 2016,284(1):194-201.
[13]
陈树俊.基于低温热处理技术的城市污泥磷回收[D]. 广州:广东工业大学, 2017. Chen S J. Phosphorus recover from sewage sludge based on thermal treatment[D]. Guangzhou:Guangdong University of Technology, 2017.
[14]
Zou J, Zhang L, Wang L, et al. Enhancing phosphorus release from waste activated sludge containing ferric or aluminum phosphates by EDTA addition during anaerobic fermentation process[J]. Chemosphere, 2016,171(12):601-608.
[15]
Zhang T X, Bowers K E, Harrison J H, et al. Releasing phosphorus from calcium for struvite fertilizer production from anaerobically digested dairy effluent[J]. Water Environment Research, 2010,82(1):34-42.
[16]
Gaudy A F. Colorimetric determination of protein and carbohydrate[J]. Water Wastes, 1962,7(1):17-22.
[17]
FrΦlund B, Griebe T, Nielsen P H. Enzymatic activity in the activated-sludge floc matrix[J]. Applied Microbiology & Biotechnology, 1995,43(4):755-761.
[18]
国家环保局.水和废水监测分析方法[M]. 北京:中国环境科学出版社, 2002:243-246. The State Environmental Protection Administration. Methods for monitoring and analyzing water and wastewater[M]. Beijing:China Environmental Science Press, 2002:243-246.
[19]
许德超,周礼杰,尹魁浩,等.加碱处理PAC污泥的释磷机理及磷回收研究[J]. 中国环境科学, 2017,37(9):3407-3415. Xu D C, Zhou L J, Yin K H, et al. Alkaline treatment of PAC (polyaluminum chloride) excess sludge:Study on mechanism of phosphorus release and phosphorus recovery[J]. China Environmental Science, 2017,37(9):3407-3415.
[20]
郝晓地,兰荔,王崇臣,等. MAP沉淀法目标产物最优形成条件及分析方法[J]. 环境科学, 2009,30(4):1120-1125. Hao X D, Lan L, Wang C C. Optimal formation conditions and analytical methods of the target product by MAP precipitation[J]. Environmental Science, 2009,30(4):1120-1125.
[21]
Siddique M N I, Wahid Z A. Achievements and perspectives of anaerobic co-digestion:a review[J]. Journal of Cleaner Production, 2018,194(9):359-371.
[22]
Yu G H, He P J, Shao L M. Characteristics of extracellular polymeric substances (EPS) fractions from excess sludges and their effects on bioflocculability[J]. Bioresource Technology, 2009,100(13):3193-3198.
[23]
Kavitha S, Adish K S, Yogalakshmi K N, et al. Effect of enzyme secreting bacterial pretreatment on enhancement of aerobic digestion potential of waste activated sludge interceded through EDTA[J]. Bioresource Technology, 2013,150(3):210-219.
[24]
Vintiloiu A, Boxriker M, Lemmer A, et al. Effect of ethylenediaminetetraacetic acid (EDTA) on the bioavailability of trace elements during anaerobic digestion[J]. Chemical Engineering Journal, 2013,223(5):436-441.
[25]
李德鹏.有机物对鸟粪石法回收废水中磷的影响[D]. 马鞍山:安徽工业大学, 2013. Li D P. Influence of organic matters on phosphorus recovery from wastewater by struvite method[D]. Maanshan:Anhui University of Technology, 2013.
[26]
胡德秀,张艳,朱玲,等.污泥厌氧过程中磷释放与SMP特性研究[J]. 中国环境科学, 2018,38(8):2974-2980. Hu D X, Zhang Y, Zhu L, et al. Characteristics of phosphorus released and soluble microbial products in anaerobic conditions of sludge[J]. China Environmental Science, 2018,38(8):2974-2980.
[27]
Tian Y, Zheng L, Sun D Z. Functions and behaviors of activated sludge extracellular polymeric substances (EPS):a promising environmental interest[J]. Journal of Environmental Sciences, 2006, 18(3):420-427.
[28]
王然登,程战利,彭永臻,等.强化生物除磷系统中胞外聚合物的特性[J]. 中国环境科学, 2014,34(11):2838-2843. Wang R D, Cheng Z L, Peng Y Z, et al. Characteristics of EPS taken from an enhanced biological phosphorus removal system[J]. China Environmental Science, 2014,34(11):2838-2843.
[29]
周群英,高廷耀.环境工程微生物学[M]. 2版.北京:高等教育出版社, 2000:187-190. Zhou Q Y, Gao T Y. Environmental engineering microbiology (2nd edition)[M]. Beijing:Higher Education Press, 2000:187-190.
[30]
Nickel K, Neis U. Ultrasonic disintegration of biosolids for improved biodegradation[J]. Ultrasonics Sonochemistry, 2007,14(4):450-455.
[31]
Kumar R, Pal P. Response surface-optimized Fenton's pre-treatment for chemical precipitation of struvite and recycling of water through downstream nanofiltration[J]. Chemical Engineering Journal, 2012, 210(11):33-44.
[32]
吕景花,袁林江,张婷婷.响应面法优化厌氧上清液除磷的研究[J]. 中国环境科学, 2014,34(1):72-77. Lv J H, Yuan L J, Zhang T T. Application of response surface methodology (RSM) to optimize chemical phosphate precipitation from phosphorus enriched supernatants of a SBR at anaerobic stage[J]. China Environmental Science, 2014,34(1):72-77.
[33]
Shehu M S, Abdul M Z, Alwi S R. Optimization of thermo-alkaline disintegration of sewage sludge for enhanced biogas yield[J]. Bioresource Technology, 2012,114(114):69-74.
[34]
Muralidhar R V, Chirumamila R R. A response surface approach for the comparison of lipase production by Canida cylindracea using two different carbon sources[J]. Biochemical Engineering Journal, 2001,9(1):17-23.
[35]
黄颖,林金清,李洪临.鸟粪石法回收废水中磷的沉淀物的组成和晶形[J]. 环境科学学报, 2009,29(2):353-359. Huang Y, Lin J Q, Li H L. Study on the composition and crystal shape of the precipitate obtained by struvite precipitation from wastewater for phosphorous recovery[J]. Acta Scientiae Circumstantiae, 2009, 29(2):353-359.
[36]
郭五珍,王宇珊,叶挺进,等.动态中温厌氧消化液进行鸟粪石回收磷的试验研究[J]. 中国给水排水, 2016,32(15):57-60. Guo W Z, Wang Y S, Ye T J, et al. recovery of phosphorus from dynamic mesophilic anaerobic digestion supernatant of sewage sludge[J]. China Water & Wastewater, 2016,32(15):57-60.
[37]
杨露,平倩,李咏梅.低磷浓度下鸟粪石结晶成粒及反应器流态模拟[J]. 中国环境科学, 2016,36(4):1017-1026. Yang L, Ping Q, Li Y M. Struvite pellet crystallization at low phosphorus concentration and fluidization simulation of the reactor[J]. China Environmental Science, 2016,36(4):1017-1026.
[38]
Li J D, Li Y B, Zhang L, et al. Composition of calcium deficient Nacontaining carbonate hydroxyapatite modified with Cu (Ⅱ) and Zn (Ⅱ) ions[J]. Applied Surface Science, 2008,254(9):2844-2850.
[39]
Yan H, Shih K. Effects of calcium and ferric ions on struvite precipitation:A new assessment based on quantitative X-ray diffraction analysis[J]. Water Research, 2016,95(5):310-318.
