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Characteristics of typical dissolved black carbons and their influence on the formation of disinfection by-products in chlor(am)ination

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 1-14页

作者： Jinhui Liang Peng Gao Benhang Li Longfei Kang Li Feng Qi Han Yongze Liu Liqiu Zhang beijing key laboratory for source control technology of water pollution Engineering Research Center for Water Pollution Source Control and Eco-remediationBeijing Forestry UniversityBeijing100083China

Dissolved black carbon(DBC)released from biochar can be one of the potential disinfection by-products(DBPs)precursors in the dissolved organic matter ***,the physiochemical and structural properties of DBC and the effects on the development of DBPs and DBP formation potential(DBPFP)during the disinfection process remain *** this study,the characteristics of two kinds of DBC,namely,animal-derived DBC(poultry litter DBC,PL-DBC)and plant-derived DBC(wheat straw DBC,WS-DBC),were *** effects of different kinds of DBC on the evolution of DBPs and DBPFP in chlorine and chloramine disinfection processes were compared with natural organic matter(NOM).The results showed that the total DBPs concentrations derived from PL-DBC,WS-DBC and NOM were similar during chlorination(i.e.,61.23µg/L,64.59µg/L and 64.66µg/L,respectively)and chloramination(i.e.,44.63µg/L,44.42µg/L and 45.58µg/L,respectively).The lower total DBPs and DBPFP concentrations in chloramination could be attributed to the fact that the introduction of ammonia in chloramine inhibited the breaking of the bond between the disinfectant and the active group of the ***,DBC presented much lower total DBPFP concentrations than NOM in both chlorination and ***,both kinds of DBC tended to form more monochloroacetic acids and haloacetamides than NOM,which could result from the higher organic strength,higher protein matter,and nitrogen-rich soluble microbial products of DBC.

关键词： Dissolved black carbon(DBC) Chlorine Chloramine Disinfection by-products(DBPs) Disinfection by-products formation potential(DBPFP)

Removal efficiencies of natural and synthetic progesterones in hospital wastewater treated by different disinfection processes

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Frontiers of Environmental Science & Engineering 2022年第10期16卷 11-22页

作者： Jinhui Liang Yuchen Luo Benhang Li Shiqi Liu Liansheng Yang Peng Gao Li Feng Yongze Liu Ziwen Du Liqiu Zhang beijing key laboratory for source control technology of water pollution Engineering Research Center for Water Pollution Source Control and Eco-remediationBeijing Forestry UniversityBeijing 100083China

Progesterones are ubiquitous in hospital wastewater(HWW)with concentrations much higher than those of estrogens and *** ensure that these water systems are safe to use,disinfection is crucial during HWW treatment by providing"front line"defense against biological ***,five disinfection processes,namely,chlorine(Cl_(2)),chlorine dioxide(ClO_(2)),ozone(O_(3)),ultraviolet(UV)),and UV/chlorine(UV/Cl_(2)),were selected to investigate their removal efficiencies for progesterones in primary filtration and secondary biological treatment *** were 61 natural and synthetic progesterones detected in HWW,with the natural progesterones being the main components with a concentration of 845.51 ng/L and contributing to 75.08%of the total *** primary filtration treatment presented insignificant removal effects on the progesterones,while the secondary biological treatment significantly reduced the progesterone content by *** order of removal efficiencies of total progesterones by different disinfection processes was UV/Cl_(2)>Cl_(2)>O_(3)>ClO_(2)>***/Cl_(2)showed the highest removal efficiency against progesterones mainly due to the activation of Cl_(2)by ultraviolet(UV)photolysis,which helps open the heterocyclic,aromatic,and phenolic rings,thus accelerating progesterone *** addition,the removal efficiencies of natural progesterones in the five disinfection processes were higher than those of synthetic progesterones(progesterone derivatives,19-nortestosterone derivatives,and 17α-hydroxyprogesterone derivatives).

关键词： Progesterones Hospital wastewater Primary filtration treatment effluent Secondary biological treatment effluent Disinfection process

Occurrence and migration of microplastics and plasticizers in different wastewater and sludge treatment units in municipal wastewater treatment plant

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Frontiers of Environmental Science & Engineering 2022年第11期16卷 203-212页

作者： Sen Dong Peng Gao Benhang Li Li Feng Yongze Liu Ziwen Du Liqiu Zhang beijing key laboratory for source control technology of water pollution Engineering Research Center for Water Pollution Source Control and Eco-remediationBeijing Forestry UniversityBeijing 100083China

Microplastics(MPs)and plasticizers,such as phthalate esters(PAEs),were frequently detected in municipal wastewater treatment plants(MWTP).Previous research mainly studied the removal of MPs and PAEs in ***,the occurrence of MPs and PAEs in the sludge was generally *** comprehensively investigate the occurrence and the migration behaviors of MPs and PAEs in MWTP,a series of representative parameters including the number,size,color,shape of MPs,and the concentrations of PAEs in wastewater and sludge were systematically *** this study,the concentrations of MPs in the influent and effluent were 15.46±0.37 and 0.30±0.14 particles/*** MP removal efficiency of 98.1%was achieved and about 73.8%of MPs were accumulated in the sludge in the *** numbers of MPs in the sludge before and after digestion were 4.40±0.14 and 0.31±0.01 particles/g(dry sludge),*** Transform Infrared Spectroscopy(ATR FT-IR)analysis showed that the main types of MPs were polyethylene terephthalate(PET),polypropylene(PP),polyethylene(PE),and polystyrene(PS).Six PAEs,including phthalate(DMP),diethyl phthalate(DEP),diisobutyl phthalate(DIBP),ortho dibutyl phthalate(DBP),butyl benzyl phthalate(BBP),and bis(2-ethyl)hexyl phthalate(DEHP),were detected in the *** concentrations of total PAEs(ΣPAEs)in the influent and effluent were 76.66 and 6.28μg/L,*** concentrations ofΣPAEs in the sludge before and after digestion were 152.64 and 31.70μg/g,*** the process of thermal hydrolysis,the number and size of MPs decreased accompanied by the increase of the plasticizer concentration.

关键词： Microplastics Municipal wastewater treatment plant Phthalate esters Thermal hydrolysis

Performance and fouling mechanism of direct contact membrane distillation(DCMD) treating fermentation wastewater with high organic concentrations

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Journal of Environmental Sciences 2018年第3期30卷 253-261页

作者： Yan Wu Yun Kang Liqiu Zhang Dan Qu Xiang Cheng Li Feng beijing key lab for source control technology of water pollution College of Environmental Science and Engineering Beijing Forestry University

In this study,direct contact membrane distillation（DCMD）was used for treating fermentation wastewater with high organic *** performance characteristics including permeate flux,permeate water quality as well as membrane fouling were investigated *** results showed that,after 12 hr DCMD,the feed wastewater was concentrated by about a factor of 3.7 on a volumetric basis,with the permeate flux decreasing from the initial 8.7 L/m^2/hr to the final 4.3 L/m^2/hr due to membrane fouling;the protein concentration in the feed wastewater was increased by about 3.5 times and achieved a value of 6178 mg/L,which is suitable for *** COD and TOC in permeate water increased continuously due to the transfer of volatile components from wastewater,organic rejection of over 95%was achieved in ***–MS results suggested that the fermentation wastewater contained 128kinds of organics,in which 14 organics *** 12 hr DCMD,not only volatile organics including trimethyl pyrazine,2-acetyl pyrrole,phenethyl alcohol and phenylacetic acid,but also non-volatile dibutyl phthalate was detected in permeate water due to membrane ***-IR and SEM–EDS results indicated that the deposits formed on the membrane inner surface mainly consisted of Ca,Mg,and amine,carboxylic acid and aromatic *** fouled membrane could be recovered,as most of the deposits could be removed using a HCl/Na OH chemical cleaning method.

关键词： Fermentation wastewater Direct contact membrane distillation Membrane fouling

Effects of solution conditions on the physicochemical properties of stratification components of extracellular polymeric substances in anaerobic digested sludge

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Journal of Environmental Sciences 2013年第1期25卷 155-162页

作者： Dongqin Yuan Yili Wang College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry University

The composition and effects of solution conditions on the physicochemical properties of the stratification components of extracellular polymeric substances （EPS） in anaerobic digested sludge were determined. The total EPS in anaerobic digested sludge were extracted by the cation exchange resin method. Another EPS extraction method, the ceutrifugation and sonication technique was employed to stratify the EPS into three fractions： slime, loosely bound （LB）-EPS, and tightly bound （TB）-EPS from the outside to the inside of the anaerobic digested sludge. Proteins and polysaccharides were dispersed uniformly across the different EPS fractions, and humic-like substances were mainly partitioned in the slime, with TB-EPS second. Protein was the major constituent of the LB-EPS and TB-EPS, and the corresponding ratios ranged from 54.0% to 65.6%. The hydrophobic part in the EPS chemical components was primarily comprised of protein and DNA, while the hydrophilic part was mainly composed of polysaccharide. In the slime, the hydrophobic values of several EPS chemical components （protein, polysaccharide, humic-like substances and DNA） were all below 50%. The protein/polysaccharide ratio had a significant influence on the Zeta potentials and isoelectric point values of the EPS： the greater the protein/polysaccharide ratio of the EPS was, the greater the Zeta potential and the higher the isoelectric point value were. All Zeta potentials of the EPS showed a decreasing trend with increasing pH. The corresponding isoelectric point values （pH） were 2.8 for total EPS, 2.2 for slime, 2.7 for LB-EPS, and 2.6 for TB-EPS. As the ionic strength increased, the Zeta potentials sharply increased and then gradually became constant without charge reversal. In addition, as the temperature increased （〈 40℃）, the apparent viscosity of the EPS decreased monotonically and then gradually became stable between 40 and 60℃.

关键词： anaerobic digested sludge extracellular polymeric substances stratification components physicochemical properties solution conditions

Removal of Pb(Ⅱ) from aqueous solution by hydrous manganese dioxide:Adsorption behavior and mechanism

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Journal of Environmental Sciences 2013年第3期25卷 479-486页

作者： Meng Xu Hongjie Wang Di Lei Dan Qu Yujia Zhai Yili Wang College of Environmental Science and Engineering Beijing Forestry University beijing key lab for source control technology of water pollution

Hydrous manganese dioxide （HMO） synthesized by redox of potassium permanganate and hydrogen peroxide was used as an adsorbent for Pb（Ⅱ） *** specific surface area,pore volume and BJH pore diameter of the HMO were 79.31m2/g,0.07cm3/g and 3.38 nm,*** adsorption equilibrium at 298K could be well described by the Langmuir isotherm equation with q max value of 352.55mg/*** negative values of G and the positive values of H and S indicated the adsorption process was spontaneous and *** pseudo second-order equation could best fit the adsorption *** value of the calculated activation energy for Pb（Ⅱ） adsorption onto the HMO was 38.23 kJ/*** uptake of Pb（Ⅱ） by HMO was correlated with increasing surface hydroxyl group content and the main adsorbed speciation was PbOH＋.The final chemical state of Pb（Ⅱ） on the surface of HMO was similar to *** was a promising candidate for Pb（Ⅱ） removal from aqueous solution.

关键词： adsorption mechanism heavy metal manganese dioxide

Synthesis of chitosan-based grafting magnetic flocculants for flocculation of kaolin suspensions

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Journal of Environmental Sciences 2024年第5期139卷 193-205页

作者： Chuang Liu Xiaoyu Wang Sicong Du Wenyan Liang beijing key lab for source control technology of water pollution/Engineering Research Center for water pollution source control&Eco-remediation/College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China

A series of novel chitosan-based magnetic flocculants FS@CTS-P(AM-DMC)was prepared by molecular structure *** characterization results showed that FS@CTS-P(AM-DMC)had a uniform size of about 21.46 nm,featuring a typical core-shell structure,and the average coating layer thickness of CTS-P(AM-DMC)was about 5.03 ***@CTS-P(AM-DMC)exhibited excellent flocculation performance for kaolin suspension,achieved 92.54% turbidity removal efficiency under dosage of 150 mg/L,pH 7.0,even at high turbidity(2000 NTU)with a removal efficiency of 96.96%.The flocculation mechanism was revealed to be dominated by charge neutralization under acidic and neutral conditions,while adsorption and bridging effects play an important role in alkaline *** properties of magnetic aggregates during flocculation,breakage,and regeneration were studied at different pH levels and *** the process of magnetophoretic,magnetic particles collide and adsorb with kaolin particles continuously due to magnetic and electrostatic attraction,transform into magnetic chain clusters,and then further form three-dimensional network magnetic aggregates that can capture free kaolin particles and other chain *** image velocimetry confirmed the formation of eddy current of magnetic flocs and experienced three stages:acceleration,stabilization,and deceleration.

关键词： Magnetic flocculation Chitosan Fe_(3)O_(4) Graft copolymerization PIV

Formation of disinfection byproducts from accumulated soluble products of oleaginous microalga after chlorination

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Frontiers of Environmental Science & Engineering 2017年第6期11卷 1-7页

作者： Yu Liu Qiao Zhang Yu Hong beijing key laboratory for source control technology of water pollution Beijing Forestry University Beijing 100083 China

When microalgae are simultaneously applied for wastewater treatment and lipid production, soluble algal products （SAP） should be paid much attention, as they are important precursors for formation of disinfection byproducts （DBPs）, which have potential risks for human health. Chlorella sp. HQ is an oleaginous microalga that can generate SAP during growth, especially in the exponential phase. This study investigated the contribution of SAP from Chlorella sp. HQ to DBP formation after *** predominant DBP precursors from SAP were identified with the 3D excitation-emission matrix fluorescence. After chlorination, a significant reduction was observed in the fluorescence intensity of five specific fluorescence regions, particularly aromatic proteins and soluble microbial by-product-like regions, accompanied with slight shifting of the peak. The produced DBPs were demonstrated to include trihalomethanes and haloacetic acids. As the algal cultivation time was extended in wastewater, the accumulated SAP strengthened the formation of DBPs. The trend for DBP formation was as follows： chloroform〉dichloroacetic acid〉trichloroacetic acid.

关键词： Chlorella sp. HQ Chlorination Disinfection byproducts Fluorescence spectroscopy Soluble algal products

Sewage sludge disintegration by high-pressure homogenization: A sludge disintegration model

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Journal of Environmental Sciences 2012年第5期24卷 814-820页

作者： Yuxuan Zhang Panyue Zhang panyue_zhang@*** Boqiang Ma Hao Wu Sheng Zhang Xin Xu beijing key laboratory for source control technology of water pollution Beijing Forestry University Beijing 100083 China

High-pressure homogenization （HPH） technology was applied as a pretreatment to disintegrate sewage sludge. The effects of homogenization pressure, homogenization cycle number, and total solid content on sludge disintegration were investigated. The sludge disintegration degree （DDCOD）, protein concentration, and polysaccharide concentration increased with the increase of homogenization pressure and homogenization cycle number, and decreased with the increase of sludge total solid （TS） content. The maximum DDCOD of 43.94% was achieved at 80 MPa with four homogenization cycles for a 9.58 g/L TS sludge sample. A HPH sludge disintegration model of DDCOD= kNaPb was established by multivariable linear regression to quantify the effects of homogenization parameters. The homogenization cycle exponent a and homogenization pressure exponent b were 0.4763 and 0.7324 respectively, showing that the effect of homogenization pressure （P） was more significant than that of homogenization cycle number （N）. The value of the rate constant k decreased with the increase of sludge total solid content. The specific energy consumption increased with the increment of sludge disintegration efficiency. Lower specific energy consumption was required for higher total solid content sludge.

关键词： high-pressure homogenization sludge disintegration homogenization pressure homogenization cycle number total solid content