Impurities In Compounds Research Articles

Partial oxidation treatment of waste polyvinyl chloride in critical water: Preparation of benzaldehyde/acetophenone and dechlorination

Abstract In this work, a partial oxidation treatment process in critical water was developed for high-efficiency dechlorination of waste polyvinyl chloride and the recovery of high value-added chemical feedstock. The partial oxidation treatment of waste polyvinyl chloride was performed at the temperature range of 200–400 °C with the mass ratio of 32 (waste polyvinyl chloride-to-oxygen). Fourier Transform Infrared Spectroscopy and Gas Chromatography-Mass Spectrometer were utilized to characterize solid residue and oil products. The chlorine in aqueous phase was measured by ion chromatography to determinate the dechlorination efficiency. The results indicated that 85.5% of the chlorine in waste polyvinyl chloride could be transferred into aqueous phase at 250 °C, and approximately 95% could be transferred at 300 °C. The temperature of critical water had a significant effect on chemical composition of oil products of waste polyvinyl chloride after the partial oxidation treatment. Two important chemical feedstock, benzaldehyde and acetophenone, could be selectively prepared from waste polyvinyl chloride by the partial oxidation treatment in critical water at lower temperature condition. The summation of the relative peak area of benzaldehyde and acetophenone from the results of Gas Chromatography-Mass Spectrometer could reach 91.74% and 91.68% at 300 °C and 350 °C. The further increase of partial oxidation treatment temperature could enhance the reactivity of oxygen involved in the system and initiate more side reactions, resulting in that many impurity compounds were generated, including phenol/phenol derivatives, naphthalene, aliphatic alkanol, and cyclanone. The purity of benzaldehyde and acetophenone in oil products decreased when the partial oxidation treatment temperature exceeded 350 °C, and the additional value of decomposition products was lowered. This result showed that the partial oxidation treatment of waste polyvinyl chloride in critical water was beneficial for both dechlorination and resources recovery.

Impurity-induced discharges in plasma electrolysis

The mechanism of impurity-induced discharges in plasma electrolysis (PE) was elucidated on the basis of a novel microstructural interpretation. We identified the presence of impurity compounds decorating the rim of the micro-pores, which were ‘fingerprint’ of plasma discharge activities. The formation mechanism of inorganic layer by PE was suggested based on the distribution of impurities and a transient diffusion pattern accompanying plasma discharges.

Promoting effect of H2S on the performance of ZrO2 and La2O3-ZrO2 catalysts in biomass gasification gas clean-up

Use of the syngas produced by biomass gasification is rendered unviable because of impurity compounds, whose efficient removal is key to the feasibility of gasification concepts. Tars present in the biomass gasification gas can be efficiently oxidized by ZrO2 catalysts. H2S has been shown to increase the oxidation activity on ZrO2 and most notably on La2O3-ZrO2. Gasification gas clean-up experiments were performed at 600–800 °C to study the beneficial effect of H2S on naphthalene and toluene conversions. During time-on-stream with repeated doses of H2S on ZrO2, cumulative and strong H2S adsorption was observed as the conversion of toluene and naphthalene increased during the first H2S doses and stabilized towards the end. Therefore, a limited capacity of the catalyst to adsorb H2S was suggested, which is the origin of sulfur tolerance. Activity enhancement with H2S occurs most notably on La2O3-ZrO2 and towards naphthalene oxidation. XPS characterization of the used catalysts showed sulfur retention on the La2O3-ZrO2 but not on pure ZrO2, indicating that La2O3-ZrO2 holds more sulfur on its surface or binds it stronger. The surface properties of La2O3-ZrO2 were thus characterized with in situ DRIFTS using CO2 and CH3OH as probe molecules. The surface of La2O3-ZrO2 was suggested to have more low coordination sites than ZrO2, where sulfur is suggested to be bound and alter the reactivity of the surface oxygen.

Simulation study of sweetening and dehydration of natural gas stream using MEG solution

AbstractNatural gas is currently an important and popular fossil fuel and will likely continue to be in the future. In addition, natural gas can be considered as a source of hydrocarbon for petrochemical industries. Despite the fact that natural gas is mostly considered a “clean” fuel compared to other fossil fuels, the natural gas found in reservoir deposits is not necessarily “clean” and free of impurities. Natural gas consists primarily of methane, but it also contains considerable amounts of light and heavier hydrocarbons as well as contaminating compounds of CO2, N2, H2S, and other impurities. These impurities are undesirable compounds and cause several technical problems such as corrosion and environment pollution. However, many natural gas streams in different areas contain huge quantities of H2S and CO2. Many technologies can be used to purify the natural gas from acid gases. These technologies include Amine absorption, the adsorption process, cryogenic processes, and membranes. Therefore, this study aims to simulate the gas sweetening process by using the Aspen HYSYS V.7.3 program. Moreover, in this simulation work, MEG (Mono Ethylene Glycol) was selected as an absorbent for the gas sweetening process: it achieved high acid gas removal and reduced the water content from a stream of natural gas. In addition, the simulation work also achieved process optimization using several MEG concentrations and temperatures. It also investigated the effect of MEG concentrations and the inlet temperature of MEG on the regeneration reboiler temperature and duty.

Structural and Solar Cell Properties of a Ag-Containing Cu2ZnSnS4 Thin Film Derived from Spray Pyrolysis.

A silver (Ag)-incorporated kesterite Cu2ZnSnS4 (CZTS) thin film was fabricated by a facile spray pyrolysis method. Crystallographic analyses indicated successful incorporation of various amounts of Ag up to a Ag/(Ag + Cu) ratio of ca. 0.1 into the crystal lattice of CZTS in a homogeneous manner without formation of other impurity compounds. From the results of morphological investigations, Ag-incorporated films had larger crystal grains than the CZTS film. The sample with a relatively low Ag content (Ag/(Ag + Cu) of ca. 0.02) had a compact morphology without appreciable voids and pinholes. However, an increase in the Ag content in the CZTS film (Ag/(Ag + Cu) ca. 0.10) induced the formation of a large number of pinholes. As can be expected from these morphological properties, the best sunlight conversion efficiency was obtained by the solar cell based on the film with Ag/(Ag + Cu) of ca. 0.02. Electrostructural analyses of the devices suggested that the Ag-incorporated film in the device achieved reduction in the amounts of unfavorable copper on zinc antisite defects compared to the bare CZTS film. Moreover, the use of a Ag-incorporated film improved band alignment at the CdS(buffer)-CZTS interface. These alterations should also contribute to enhancement of device properties.

Crystal structure and optical properties of silver-doped copper nitride films (Cu3N:Ag) prepared by magnetron sputtering

Silver-doped copper nitride (Cu3N:Ag) films were prepared by using radio frequency and a direct current magnetron sputtering method. The effects of silver doping on the crystal structure, surface morphology, and optical properties of the films were investigated. Results demonstrated that Ag doping influences the preferred growth orientation of the films. With the increased Ag content, the films grow from the (1 0 0) crystal face to the (1 1 1) crystal face. Ag doping changes the lattice constant, grain size, and optical band gap of Cu3N:Ag films. Cu3N:Ag films achieve the most remarkable crystallinity at 0.23 at% of Ag with lattice constant and optical band gap of 0.381 88 nm and 1.30 eV, respectively. Moreover, the doped Ag atoms fill the hollows in the Cu3N lattice and consequently reach the high-energy defect level. These atoms also generate impurity compound centers at high-energy level, shorten the non-equilibrium carrier lifetime of the films, and weaken the electronic transportation of the films.

Influence of FeSe doping on superconducting properties of MgB2 by hybrid microwave method

The effect of FeSe doping on the physical properties of MgB2 is studied. Bulk samples of the FeSe doped MgB2 with weight ratio x(FeSe:MgB2)=0%,3%,7%and10% were prepared by hybrid microwave method. It is proved that FeSe is not stable together with MgB2. Fe2+ enters into MgB2 lattice, some Mg2+ and Se2− are combined into the new impurity compound MgSe. The superconducting transition temperature (Tc) slightly decreased with increasing doping content of FeSe from R-T and M-T curves, which results from the substitution of Mg2+ by Fe2+ in the MgB2 lattice. The Jc increase slightly with the FeSe doping content increasing from 3 wt % to 10 wt %, which results from the increasing MgSe impurity pinning centers.

Synthesis and isolation of theaflavin from fresh tea leaves as bioactive ingredient of antioxidant supplements

Theaflavin (TF) is a product of catechin oxidation that give contribution to golden yellow color, brightness, briskness of black tea and has a potential as natural antioxidant activity. TF has a higher superoxide radical capture rate than EGCG (Epigallocatechin gallate). The study was to synthesize TF components in the form of extracts that have high antioxidants. Materials used in this research is bud+3 leaves from RITC clone (GMB 7). The research were caried out used 15 liters of tea leaves pulp per treatment, fermentation using fermentor with 15 L/min, 20 L/min and 25 L/min airflow treatment, separation of TF from thearubigin (TR) used 2.5% NaHCO3, and isolation of TF from impurity compounds used silica gel column with ethyl acetate/hexane as eluent, and DPPH (1,1-diphenyl-2-picryl hydrazyl) for antioxidant activity. The result showed that TF synthesis of fresh tea leaf catechin at water-air rate of 25 liters/minute could produced TF extract and yield TF purity extract with 1.01% and 39.15% in dry weight respectively after isolation by silica gel column. Antioxidant activity by DPPH from TF extract showed the smallest value of EC50 is 12.16 mg/L at 150 mg dose and its activity increased with the addition of concentration of TF extract.

Penggunaan H-Zeolit dan Tawas dalam Pemurnian Crude Glycerol dengan Proses Adsorpsi dan Koagulasi

Production of biodiesel from used cooking oil byproducts such as crude glycerol with low purity. The crude glycerol containing compounds impurities such as free fatty acids, alcohol, soap, catalyst and water. Compound adsorption of impurities can be done with the H-zeolite as adsorbent, but the resulting quality is still not good. To improve its quality, this research was added alum (coagulation) process so that the adsorption of colloidal-sized compound impurities which can be separated from the glycerol. The purpose of this research is determine optimal condition of adsorption and coagulation impurity compounds of crude glycerol by using H-zeolite and alum and also determine quality of glycerol was obtained. First, crude glycerol acidified by phosphoric acid 85% (pure analysis) until desired pH ±2.5. It was obtained purity of glycerol 72.797%. The next process is adsorption with activated H-zeolite and it obtained purity of glycerol 77.079%. The last process in this research is adsorption and coagulation by using H-zeolite and alum. The highest purity glycerol 93.803% was obtained from condition of adsorption and coagulation for 75 minutes; alum’s concentration 80 ppm; and temperature 60 ºC. The glycerol discharged from adsorption and coagulation process by using H-zeolite and alum is qualify Indonesia National Standard number 06-1564-1995 with 3.512% water content; 2.438% ash content; 0.247% MONG content; has no sugar; 1.259 g/mL density of glycerol; 0.2356% potassium content and 0.0410% aluminium content; and brighter color.DOI: http://dx.doi.org/10.15408/jkv.v0i0.5143

A Simple and Direct LC-MS Method for Determination of Genotoxic Impurity Hydroxylamine in Pharmaceutical compounds.

Hydroxylamine is a known genotoxic impurity compound that needs to be controlled down to ppm level in pharmaceutical processes. It is difficult to detect using conventional analytical techniques due to its physio-chemical properties like lack of chromophore, low molecular weight, absence of carbon atom and high polarity. In addition to that, analysis of the pharmaceutical samples encounters considerable obstruction from matrix components that greatly overshadow the response of hydroxylamine. This study describes a simple, sensitive and direct Liquid Chromatographic-Mass Spectrometric method (LC-MS) for detection of hydroxylamine in pharmaceutical compounds. The LC-MS method was detected up to 0.008 ppm of hydroxylamine with S/N > 3.0 and quantified up to 0.025 ppm of hydroxylamine with S/N ratio >10.0. This validated method can be applied as a generic method to detect the hydroxylamine for pharmaceutical process control and drug substance release.

ХАРАКТЕРИСТИКА ЗОЛЬ-ГЕЛЬ ПРОЦЕСУ В СИСТЕМІ YxBax+nCu2x+nOδ (x=1, n=1; x=2, n=3; x=3, n=2)

With the help of sol-gel technology was obtained superconducting compound number YxBax+nCu2x+nOδ (x=1, n=1; x=2, n=3; x=3, n=2) with submicron size particles. As a gel maker in these systems was used citric acid monohydrate. An extensive scheme fusion technology was shown. The process described synthesis using thermal, infrared spectroscopic analysis and scanning electron microscopy. There are some aggregations of microparticles mostly for the phases that are synthesized at higher temperatures. Due to Thermal Analysis of modes were optimized heat treatment samples. According to IR spectroscopy were controlled processes of decomposition of the charge and the formation of the superconducting phase. It was grounded the choice of analysis methods for the starting compounds and the present calculation algorithm for this synthesis. Studies have shown that even at the beginning of the synthesis batch contained no impurity compound allowing argued that the sol-gel synthesis is a promising method that provides high homogeneity of the material the early stages of the synthesis and enables lower temperature and a subsequent heat treatment. The results of electron microscopy showed that due to the relatively low temperature of synthesis occurs the formation of submicron sized particles, while solid-phase techniques facilitate rapid crystal growth due to the formation of liquid phases at high temperature. The principles and ideas described in this paper can be adapted to more complex oxide systems. Thus, in this paper describes how you can achieve chemical homogeneity at the molecular level in multicomponent systems YxBax+nCu2x+nOδ (x=1, n=1; x=2, n=3; x=3, n=2) using sol-gel technology.

Molecular Dynamics of Amorphous Sulfamethazine With Structurally Related Sulfonamide Impurities Evaluated Using Thermal Analysis

In this study, the effects of structurally related organic impurities on the molecular dynamics of amorphous sulfamethazine were evaluated using thermal analysis. Sulfanilamide (SNA), sulfamerazine (SMR), and sulfadimethoxine were used as virtual impurities of sulfamethazine. The amorphous state was prepared in situ in differential scanning calorimetry by quenching the melted physical mixtures of sulfamethazine and each impurity compound in the differential scanning calorimetry pan. In the following heating process, the glass transition temperatures (Tg) of each were measured. The fragility parameters were estimated from the width of Tg. The Tg of amorphous sulfamethazine with those impurities changed in accordance with the manner set forth in the Gordon-Taylor equation. The fragility parameter slightly increased when a small amount of SNA or SMR was incorporated. Moreover, the probability of a measurement in which crystallization of sulfamethazine was observed above its Tg, increased at a low-concentration range of SNA, SMR, or sulfadimethoxine. It was considered that the existence of a small amount of impurity would induce heterogeneity in the molecular density of the amorphous state, which would be associated with the local fluctuation. It was suggested that the change in the molecular dynamics would be related to the probability of crystallization of sulfamethazine.

Slag Formation – Thermodynamic Aspects and Experimental Observations

AbstractSlags have a central role in pyro-metallurgical processes. They bind impurity compounds and absorb reaction products like oxides and sulfides. Functional slags are made by adding lime, magnesia, fluorspar, bauxite, calcium aluminate or other compounds into the reactor vessel where they form the slag together with the targeted reaction products. Additionally, refractory materials of the vessel tend to dissolve into the slag and thus influence its properties. Converter process for steelmaking is a rapid process and slag formation is extremely essential to ensure slag’s metallurgical functions and to avoid harmful reactions with the refractory materials. In this contribution, the progress of understanding the phenomena controlling slag formation and means to promote it were shortly reviewed. Thermodynamic constraints in slag formation were examined and the influence of fluxing additions was experimentally stated. Prefabricated “self-fluxing” lime was tested in industrial scale and proved to be a potential slag forming agent. Slag formation in secondary metallurgy and reduction of slag with aluminum dross or granules were experienced, and the effect on desulfurization and steel cleanliness was discussed.

Thermal Evolution of BaO-CuO Flux as Sintering Aid for Proton Conducting Ceramic Fuel Cells

The eutectic melt of BaO-CuO flux is known to be a potential sintering aid for Ba(Zr,Y)O₃ (BZY) electrolyte for proton-conducting ceramic fuel cells (PCFCs). A density of BZY higher than 97% of theoretical density can be achieved via sintering at 1300℃ for 2 h using a flux composed of 28 mol% BaO and 72 ㏖% CuO. In the present study, chemical and structural evolution of BaO-CuO flux throughout the sintering process was investigated. An intermediate holding step at 1100℃ leads to formation of various impurity compounds such as BaCuO 1.977 , Ba 0.92 Cu 1.06 O 2.28 and Cu 16 O 14.15 , which exhibit significantly larger unit cell volumes than the matrix. The presence of such secondary compounds with large lattice mismatch can potentially lead to mechanical failure. On the other hand, direct heating to the final sintering temperature produced CuO and Cu₂O as secondary phases, whose unit cell volumes are close to that of the matrix. Therefore, the final composition of the flux is strongly affected by the thermal history, and a proper sintering schedule should be used to obtain the desired properties of the final product.

Changes in Components of Tyre-derived Oil After Sulphur and Heteroatom Removal Using Three Acids

Tyre-derived oil consists of many types of hydrocarbons such as aromatic hydrocarbons and sulphur compounds. Aromatic hydrocarbons can generate gum in the engine, which results in a lower efficiency of the engine and causes black smoke. Moreover, sulphur compounds can also cause air pollution. Conventionally, acid treatment has been adopted by small companies that aimed at reducing aromatics, but it also gives undesired compounds in the tyre-derived oil. It has been reported that sulphuric acid can remove impurity and sulphur compounds in waste lube oil. However, it is suspicious that sulphuric acid used in the acid treatment can also form heteroatom-containing hydrocarbon molecules, such as S compounds, in the oil. So can other acids. In this work, sulphuric acid, nitric acid, and hydrochloric acid were used as chemicals in acid treatment in order to investigate the changes in components in tyre-derived pyrolysis oil. The products were analyzed by using SIMDIST-GC, GC×GC-TOF/MS, and S analyzer. The results showed that the volume of tyre-derived oils decreased about 50 wt.% together with 50 % sludge formation when sulphuric and nitric acids were used. For hydrochloric acid, the volume of tyre-derived oil decreased about 10 wt.%. The tyre-derived oil contained 5% gasoline, 25 % kerosene, 35 % gas oil, LVGO 8 % and HVGO 27 %. The results from GC×GC-TOF/MS were used to explain the changes in oil components before and after treatments.

Synthesis of Lithium Titanate (Li4Ti5O12) by Addition of Excess Lithium Carbonate (Li2CO3) in Titanium Dioxide (TiO2) Xerogel

Lithium titanate, Li4Ti5O12 (LTO) is a promising candidate as lithium ion battery anode material. In this investigation, LTO was synthesized by a solid state method using TiO2 xerogel prepared by the sol-gel method and lithium carbonate (Li2CO3). Three variations of Li2CO3 content addition in mol% or Li2CO3 molar excess were fabricated, i.e., 0, 50 and 100%, labelled as sample LTO-1, LTO-2 and LTO-3, respectively. The characterizations were made using XRD, FESEM, and BET testing. These were performed to observe the effect of lithium excess addition on structure, morphology, and surface area of the resulting samples. Results showed that the crystallite size and surface area of each sample was 50.80 nm, 17.86 m2/gr for LTO-1; 53.14 nm, 22.53 m2/gr for LTO-2; and 38.09 nm, 16.80 m2/gr for LTO-3. Furthermore, lithium excess caused the formation of impure compound Li2TiO3, while a very small amount of rutile TiO2 was found in LTO-1. A near-pure crystalline Li4Ti5O12 compound was successfully synthesized using the present method with stoichiometric composition with 0% excess, indicating very little Li+ loss during the sintering process.

Vanadium Extraction Opportunities in Alumina Production and Vanadium Complex Study in Organic Phase

One of the steady vanadium extraction sources is by-products of alumina production. The object of study is circulating solution of alumina production, containing 280 g/dm<sup>3</sup> Na<sub>2</sub>O and 0.40-0.57 g/dm<sup>3 </sup>V<sub>2</sub>O<sub>5</sub>. Vanadium compounds can be extracted from alumina solution by crystalization. It was determined that the fluorine admixture has a considerable influence on crystallization of vanadium compounds. The presence of fluorine admixture decreases the vanadium dissolubility due to the formation of Na<sub>7</sub>(VO<sub>4</sub>)<sub>2</sub>F·19H<sub>2</sub>O. The physical-chemical analysis of crystallization products showed that the increase of extraction rate for vanadium was due to not only formation of salt containing fluorine, but also because of phosphorus crystallization on its surface. And this fluorine crystallization, in its turn, is the additional source for vanadium crystallization. The vanadic compound is identified as Na<sub>7</sub>(VO<sub>4</sub>,PO<sub>4</sub>)<sub>2</sub>F·19H<sub>2</sub>O. Extraction of vanadium (V) from pulp using tributylphosphate (TBP) as extragent enables us to increase the effectiveness of the vanadium extraction and to decrease the amount of wastewater in technological process. Pulp is produced by introducing hydrochloric acid into vanadium by-product. In practice, vanadium is extracted by tributylphosphate from hydrochloric acid solutions. Hydrochloric acid solutions formed in the process of extraction from the pulp are intermediate between solid phase (insoluble part of vanadium product and compounds of impurities) and organic phase. The study presents the findings of physical-chemical analysis of vanadium organic complex extracted by tributylphosphate. Such a complex, with high likelihood, has the form of [H<sub>3</sub>O<sup>+</sup>·nH<sub>2</sub>O·mTBP][VO<sub>2</sub>Cl<sub>2</sub>·pTBP·hH<sub>2</sub>O

The material performance of HSS (high speed steel) tools and its relation with chemical composition and carbide distribution

The study aims to compare the performance of two types of material HSS (High Speed Steel) are widely used. It also will be the chemical composition and distribution of carbide particles therein. Two types of HSS are available in the market: HSS from Germany (Bohler) and HSS from China. This research employed the pure experimental design. It consists of two stages. The first, aims to test/operate lathe machines to determine the lifetime and performance of tools based on specified wear criteria. The second, characterization of microstructure using SEM-EDS was conducted. Firstly, grinding of toolss was done so that the toolss could be used for cutting metal in the turning process. Grinding processes of the two types of toolss were done at the same geometry, that is side rake angle (12°-18°), angle of keenness (60°-68°), and side relief angle (10°-12°). Likewise, machining parameters were set in the same machining conditions. Based on the results of the tests, it is found that to reach 0.2 mm wear point, toolss made of HSS from Germany needed 24 minutes, while toolss made of HSS from China needed 8 minutes. Next, microstructure tests using SEM/EDS were done. The results of the SEM tests indicate that the carbide particles of HSS from Germany were more evenly distributed than the carbide particles of HSS from China. Carbide compounds identified in HSS from China were Cr23C6 and Fe4Mo2C. Oxide impurity of Al2O3 was also found in the material. On the other hand, in HSS from Germany, no impurity and other carbide compounds were identified, except Cr23C6 and Fe4Mo2C, also Fe4W2C, and VC or V4C3.

Nanostructural Biochemical Modification Of Flax Fiber In The Processes Of Its Preparation For Spinning

Abstract The elaborated principles of nanoengineering of linen textile materials implement the techniques of spatially localized effects of protein catalysts on polymeric cellulose companions with selective splitting of impurity compounds without damaging technologically necessary nano-sized formations of binders in the fiber structure. The ranges of optimal values of the residual content in flax fiber prepared for spinning are identified on the basis of the analysis of the successive stages of enzymatic and peroxide treatments contribution to the breakdown of polymers and the differentiation of the influence of impurities on the yarn technological properties. The recommended level of residual pectin, lignin and hemicellulose (wt. %) is: after enzymatic treatment P1 = 1,0±0,1; L1 = 3,9±0,3; Hc1 = 11,0±1,0; after peroxide bleaching P2 = 0,4±0,05; L2 = 2,3±0,3; Hc2 = 7,5±0,5. The required level of fiber structural modification at the stage of preparing roving for spinning can be achieved through use of protein catalysts whose globule size is 50...100 nm. The use of enzymes with these dimensional characteristics helps to ensure breaking of polymer adhesives on the surface of incrusts and in the areas of intercellular formations, which hinder fiber crushing, without damaging nano-sized binding fractions. The implementation of this method contributes to a significant improvement in the uniformity of structural and physical and mechanical properties of flax yarn. Increase in yarn fineness and strength properties of semi-finished products, as well as improvement of deformation properties and reduction of yarn breakages during the spinning processes are achieved.

PENGARUH VARIASI BIOMASSA Pistia stratiotes L. TERHADAP PENURUNAN KADAR BOD, COD, DAN TSS LIMBAH CAIR TAHU DI DUSUN KLERO SLEMAN YOGYAKARTA

Background: Some industries know in Orchard of direct Klero Sleman Yogyakarta throw away the liquid waste to river Gawe without done a processing beforehand, so that cause the river water becomes the impure. Others, there are sigh from society of around industry know that is incidence of smelling, so that society which live in about industry know to become annoyed. This Research aim to know influence of variation of biomassa Pistia stratiotes L. to degradation rate of BOD, COD, and TSS liquid waste know at Orchard of Klero Sleman Yogyakarta. Processing of liquid waste by exploiting Pistia stratiotes L. expected can lessen compound rate of impure toxic compound and also consisting is in underwater of waste. Method: this was pure experimental research using complete random device. Involved in variable was variation of biomassa Pistia stratiotes L. as independent variable. Rate of Biologycal Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and Total Suspended Solid (TSS) as dependent variable. Research executed in Countryside of Pereng Sumberharjo Yogyakarta. Measurement of parameter BOD, COD, and TSS conducted in Laboratory Hall Technique Health of Environment (BTKL) Bantul. Sample for this research was liquid waste know in Orchard of Klero Sleman Yogyakarta. Result of research analyzed to use test of ANOVA and test of BNT (Least Significant Different). Result: Result of analysis influence variation of biomassa Pistia stratiotes L. to degradation of rate BOD, COD, and TSS use test of ANOVA show value equal to 2966,67, 8836,57, 1337,33 with level of significance equal to 0,000 (p<0,05) which indication that variation excelsior of biomassa Pistia stratiotes L. hence excelsior also degradation of rate of BOD, COD, and TSS. Conclusion: There was influences which significant between variation of biomassa Pistia stratiotes L. to degradation of rate of BOD, COD, and TSS liquid waste know in Orchard of Klero Sleman Yogyakarta. Keywords: Biomassa, Pistia Stratiotes L., BOD, COD, and TSS Liquid Wast, Soybean cake