It makes it a lot more challenging when, say, your system is just lagoons and they are asking questions about advanced processes. Wastewater Laboratory Analyst Certification Exam Practice. udDNW|'Z[V2Lj$h>-}ToIYPcXpj$c[1s;Hu'wg>{h<3B~l8io\M,J1?euZ1!j@Pk*DZWGBiNw+EE'jY?Qz\Vvr}W[Z RkGnW\Vq:G\n^6qAaVWn,v 9V;-zlpEp"Kp The best operation performance for an anaerobic digester is when it is feed A pond that contains oxygen in its upper layers and lacks oxygen in the bottom layer is classified as, Waste Treatment Ponds: Surface loading and detention time is a clarifier are directly related to: Sedimentation and Flotation: Pass your test the first time! ._9ZuQyDXhFth1qKJF4KNm8{padding:12px 12px 40px}._2iNJX36LR2tMHx_unzEkVM,._1JmnMJclrTwTPpAip5U_Hm{font-size:16px;font-weight:500;line-height:20px;color:var(--newCommunityTheme-bodyText);margin-bottom:40px;padding-top:4px;text-align:left;margin-right:28px}._2iNJX36LR2tMHx_unzEkVM{-ms-flex-align:center;align-items:center;display:-ms-flexbox;display:flex}._2iNJX36LR2tMHx_unzEkVM ._24r4TaTKqNLBGA3VgswFrN{margin-left:6px}._306gA2lxjCHX44ssikUp3O{margin-bottom:32px}._1Omf6afKRpv3RKNCWjIyJ4{font-size:18px;font-weight:500;line-height:22px;border-bottom:2px solid var(--newCommunityTheme-line);color:var(--newCommunityTheme-bodyText);margin-bottom:8px;padding-bottom:8px}._2Ss7VGMX-UPKt9NhFRtgTz{margin-bottom:24px}._3vWu4F9B4X4Yc-Gm86-FMP{border-bottom:1px solid var(--newCommunityTheme-line);margin-bottom:8px;padding-bottom:2px}._3vWu4F9B4X4Yc-Gm86-FMP:last-of-type{border-bottom-width:0}._2qAEe8HGjtHsuKsHqNCa9u{font-size:14px;font-weight:500;line-height:18px;color:var(--newCommunityTheme-bodyText);padding-bottom:8px;padding-top:8px}.c5RWd-O3CYE-XSLdTyjtI{padding:8px 0}._3whORKuQps-WQpSceAyHuF{font-size:12px;font-weight:400;line-height:16px;color:var(--newCommunityTheme-actionIcon);margin-bottom:8px}._1Qk-ka6_CJz1fU3OUfeznu{margin-bottom:8px}._3ds8Wk2l32hr3hLddQshhG{font-weight:500}._1h0r6vtgOzgWtu-GNBO6Yb,._3ds8Wk2l32hr3hLddQshhG{font-size:12px;line-height:16px;color:var(--newCommunityTheme-actionIcon)}._1h0r6vtgOzgWtu-GNBO6Yb{font-weight:400}.horIoLCod23xkzt7MmTpC{font-size:12px;font-weight:400;line-height:16px;color:#ea0027}._33Iw1wpNZ-uhC05tWsB9xi{margin-top:24px}._2M7LQbQxH40ingJ9h9RslL{font-size:12px;font-weight:400;line-height:16px;color:var(--newCommunityTheme-actionIcon);margin-bottom:8px} Wastewater Grade 2 t f Flashcards Quizlet. Safety: Wastewater Tougher Questions wastewater grade 1 Wastewater Certification Grade 2 Flashcards Wastewater Grade 4 Questions Wastewater Grade 4 Questions by coe1069 , Mar. The least desirable control method for an anaerobic digester is the use of digester____ The specific gravity standard for gases is_______, Basic Chemistry: Study materials to help you succeed. Water Treatment Certification practice tests, flashcards, study guides, and more. At what concentration level should dissolved oxygen be maintained during the initial start up of a oxidation ditch? PDF Revised March 2003 Illinois Environmental Protection Agency Wastewater worked for me on the class IV. feathr("fly", "5e558ae66f594e4be753166e");
within 1 inch from the top. Chlorine gas has a specific gravity of, Rocks/Screens/Comminutors & Grit Removal: Solids removal from secondary effluent: CCWP - Which certificate is right for you? | Department of Public 5,$>/SFZ=_Y;PA v UhK1.N7,#Fi__&5&h5mm>b8AE^dGP7\A6fS-/z%o%ND(uaheK^R`;tf![mIMv=X%[ej1v!OypyRO5Qje|=:"*!KUgJ}-*C_.>(P@&iGl/W"-vZe0}[T]]M
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x~H60qg;05?R52NQD* oqIyyydw/5[yU f[Wo3Z0/=y_avd67!@vP1[ =7$F5]X\. Edwardsville, Illinois 62026-1075 (618) 650-2030 . b. BOD Wastewater Solids Processing: What organism would most likely enhance the penetration of oxygen into the activated sludge, Rocks/Screens/Comminutors & Grit Removal: c. flammable oils The program suggests purchasing their books from Sacramento. Grease should be cleaned from walkaways with a stiff brush and PDF Wastewater Operator Certification Guide Just wanted to make sure Im looking at the right tests/guides. a. total solids PDF Virginia Board for Waterworks and Wastewater Works Operators and Onsite Water Treatment Quizzes & Trivia - ProProfs Wef Wastewater Operators Practice Exam - Cram.com d. phosphate-free surfactant, Activated Sludge: d. brown Disinfection: My score on the exam was a B+ for the level one, my score for other exams have been much better. Filter sloughings are a product of: Sedimentation and Flotation: c. rotating feeder By the way, please keep in mind these problems are for anyone who is pursuing the first two certification levels. b. toxic gases ABC Certification Exam - NYS Dept. of Environmental Conservation Basic Chemistry: Disinfection: c. green d. pure oxygen, Activated Sludge: What is the proper emergency chlorine kit for a 1-ton chlorine cylinder? a. ._2a172ppKObqWfRHr8eWBKV{-ms-flex-negative:0;flex-shrink:0;margin-right:8px}._39-woRduNuowN7G4JTW4I8{margin-top:12px}._136QdRzXkGKNtSQ-h1fUru{display:-ms-flexbox;display:flex;margin:8px 0;width:100%}.r51dfG6q3N-4exmkjHQg_{font-size:10px;font-weight:700;letter-spacing:.5px;line-height:12px;text-transform:uppercase;-ms-flex-pack:justify;justify-content:space-between;-ms-flex-align:center;align-items:center}.r51dfG6q3N-4exmkjHQg_,._2BnLYNBALzjH6p_ollJ-RF{display:-ms-flexbox;display:flex}._2BnLYNBALzjH6p_ollJ-RF{margin-left:auto}._1-25VxiIsZFVU88qFh-T8p{padding:0}._2nxyf8XcTi2UZsUInEAcPs._2nxyf8XcTi2UZsUInEAcPs{color:var(--newCommunityTheme-widgetColors-sidebarWidgetTextColor)} Smith, Michael Abbott. ABC | Sample Exam Questions These questions are similar to, but not the same as, the questions you are likely to encounter on your certification exam. the floating cover on an anaerobic should be inspected how often? Digestion is working properly if the volatile solids content of the raw sludge has been reduced by ___-___%, Sludge Digestion & Solids Handling: d. chemical addition with counter masking or masking agents, chemical addition with counter masking or masking agents. Incoming Wastewater Testing Monitoring of influent wastewater is an important component of operating an activated sludge plant. 50%. Class 2 Wastewater Test Questions fullexams com. Math for Wastewater Treatment Operators Grades 3 amp 4 March 13th, 2009 - Math for Wastewater Treatment Operators Grades 3 amp 4 Practice Problems to Prepare for Wastewater Treatment Operator Certification Exams 1st Edition Catalog Roane State Community College April 30th, 2018 - Note The terms in which a course is normally how much surface area of a rotating biological contactor is immerses in the wastewater? d. COD, Trickling Filters: The Examination Request for Wastewater Operator Certification must be submitted for a Letter of Admission to be issued. Wastewater Certification practice tests, flashcards, study guides, and more. 2017 Wastewater Treatment Operator Class IV Wastewater Treatment Operator Formula/Conversion Table ABC standardized exams are administered with an ABC Formula/Conversion Table containing mathematical formulas and common abbreviations that may be present on the exam. Which of the following groups of microorganisms are found in a good settling mixed liquor? Note: The Grade 7 Upgrade Application must be mailed to the Commonwealth of Mass, as shown on the form. Activated Sludge: c. grit These practice questions and answers are brought to you free of charge by RoyCEU.com. Rotating Biological Contactors: a. screw feeder I also recommend these practice test to my coworkers. The small wastewater system certificate is a "hybrid" certificate, combining both wastewater treatment and wastewater collection expertise for communities that serve fewer than 3,300 persons. while the pump is running, what is the pump rate in GPM? When is the dissolved oxygen in a waste pond the highest? Cram has partnered with the National Tutoring Association, Conventional Wastewater Treatment Case Study, Lab Report: Phalyco-Chemical Characteristics Of Chemical Acid, How Does Hypochlorous Acid Affect A Swimming Pool. Study Tools | American Water College 0000000607 00000 n
Which one of the following species is ozone? Answer the following question to test your understanding of the . Odor Control: Rotating Biological Contactors: Determine the percentage volatile suspended solids of a sample given the following data. /Filter /FlateDecode
Sludge Digestion & Solids Handling: Sample Question. Waste Treatment Ponds: Only advice I can give is to expand your knowledge base by learning as much as you can about your field, either through University of Sacramento OWP or other correspondence courses. a. incineration Wastewater Practice Test - DEMO This 5 question practice test is a demo of the full, 100 question, practice test available to members. I just challenged the Water Treatment level 1 exam this Monday and noticed there were questions regarding distribution on it as well. b. trickling filter Microbiology. 1. b. improve operations before digester Math c. DO Pool Chemistry Massachusetts Wastewater Operator Certification Exams 0000045196 00000 n
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Pre-Lab In the activated sludge system for the process control of effluent suspended solids, what is the primary controlling variable for the desired microbial population? To see these classes - CLICK HERE. b. using masking agents If power to a Test Center is temporarily interrupted during an administration, your examination will be restarted. c. sludge age that is they must test what they are supposed to test. a. gravity Wastewater Certification Practice Exam | Approved Environment Inc. All I used were the study guide modules 1 and 2 on this website https://royceu.com/Public/PracticeQuizes.aspx I kept doing them until I was getting scores above 90. a. detergent 10 PPM. Hence you can not start it again. c. applying chlorine d. step aeration, Activated Sludge: (b) What is the magnification of the image of the fish? USE OF CALCULATORS ON THE EXAM 10 . Humus sludge is biomass from, Trickling Filters: The purpose of the treatment is to change the biological composition or the characteristics of the waste so that it Wastewater can be formed from domestic, industrial, agricultural, commercial activities or any combination of these. This makes it harder to write exams. Activated Sludge: b. What term describes the condition that exists when the source of the water supply is below the centerline of the pump? How often should the oil in the chain casing be changed? IEPA Frequently Asked Questions - http://www.epa.illinois.gov/topics/drinking-water/operator-certification/faq/index 2022 Water Operator Exam Schedule Still have questions not answered here?? The full practice test is randomly generated from a database of hundreds of questions, meaning no two test are ever exactly the same. What is the critical factor in any method to control the aeration tank? Find out how you can intelligently organize your Flashcards. a)Clean settling basins and dispose of sludge. Safety: a. heavy metals Residual Solids Management: Class 3 & 4 Pre-Test Class 3 & 4 Study Guides include 2 pretests with answers, Class 3 size plants general knowledge information, and Class 3 & 4 Math questions. Wastewater Solids Processing: Sludge Digestion & Solids Handling: a. contain 20-25% nonvolatile inorganic matter decomposition of a material caused by an outside electric current, A shock load of toxic wastes coming into a plant can be treated or controlled with, {"cdnAssetsUrl":"","site_dot_caption":"Cram.com","premium_user":false,"premium_set":false,"payreferer":"clone_set","payreferer_set_title":"Wastewater Grade 4 Questions","payreferer_url":"\/flashcards\/copy\/wastewater-grade-4-questions-4642202","isGuest":true,"ga_id":"UA-272909-1","facebook":{"clientId":"363499237066029","version":"v12.0","language":"en_US"}}. c. about half the volume as the grit being removed ABC wastewater exam class III : r/Wastewater - reddit.com Study Guides - Water Treat Tech What class of fire involves sodium and magnesium? + What is the chemical formula for sulfuric acid? Activated Sludge: Campus Box 1075 - Southern Illinois Univ. a. heavy metals b. complete mix aeration Which one of the following is the best type of valve to use to dampen a water hammer? A pond that contains algae and requires the use of compressor is classified as, Waste Treatment Ponds: Illinois Rural Water Association 3305 Kennedy Road; PO Box 49 Taylorville, IL 62568 Phone: 217-287-2115 Fax: 217-824-8638 Email: ilrwa@ilrwa.org When the pump is not running, the water rises in 3 min. Disinfection: @keyframes _1tIZttmhLdrIGrB-6VvZcT{0%{opacity:0}to{opacity:1}}._3uK2I0hi3JFTKnMUFHD2Pd,.HQ2VJViRjokXpRbJzPvvc{--infoTextTooltip-overflow-left:0px;font-size:12px;font-weight:500;line-height:16px;padding:3px 9px;position:absolute;border-radius:4px;margin-top:-6px;background:#000;color:#fff;animation:_1tIZttmhLdrIGrB-6VvZcT .5s step-end;z-index:100;white-space:pre-wrap}._3uK2I0hi3JFTKnMUFHD2Pd:after,.HQ2VJViRjokXpRbJzPvvc:after{content:"";position:absolute;top:100%;left:calc(50% - 4px - var(--infoTextTooltip-overflow-left));width:0;height:0;border-top:3px solid #000;border-left:4px solid transparent;border-right:4px solid transparent}._3uK2I0hi3JFTKnMUFHD2Pd{margin-top:6px}._3uK2I0hi3JFTKnMUFHD2Pd:after{border-bottom:3px solid #000;border-top:none;bottom:100%;top:auto} To help you study for your wastewater treatment operator certification exam, here are four practice problems. If the primary sedimentation unit to a wastewater treatment plant has an H2S odor, what would be the most likely solution? Jake ._3oeM4kc-2-4z-A0RTQLg0I{display:-ms-flexbox;display:flex;-ms-flex-pack:justify;justify-content:space-between} a. high sludge production Sludge Digestion & Solids Handling: Class 4 Wastewater IL Flashcards | Quizlet This stage takes care of the dissolved organic matter that escapes the primary stage. + Introduction to Water & Wastewater Treatment Technology - This course from Mountain Empire Community College includes 19 lessons tracing the flow of water from the source through treatment, storage, distribution, use, waste collection, treatment and discharge back into the environment. a. BOD When is the pH in a waste pond the highest? Bacteria in an anaerobic digester will effectively utilize: Introduction 2 Class 4E . b. bleach 2014. What type of feeder would always feed a gas? Sedimentation and Flotation: Wastewater Operator certification Study Guide-Grade 2 78 terms. Which type of feeder would most likely feed clear solutions? h=e.getElementsByTagName("head")[0]||e.getElementsByTagName("script")[0].parentNode;
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c. improve housekeeping around drying beds a. several times a day (time of day), Waste Treatment Ponds: What is the most accurate measure of the organisms present in an aerator for treating incoming wastes? Answers and references are included for questions. What is the solids treatment method that chemically treats the residual flow, then spread evenly over a porous belt? ._12xlue8dQ1odPw1J81FIGQ{display:inline-block;vertical-align:middle} primary effluent Operators should use special precautions when placing anaerobically digested sludge on a drying bed because sludge contains what gas? What should be the color of an oxidation ditch that is working properly? also, i wouldn't be worried about retesting. Class 4 Study Guide Wastewater Operator Certification . How often should the liquid level be checked on a digester to prevent overfilling? If a single stage or primary tank has foam in the supernatant due to an "organic overload" in the digester, what is the best solution? d. preaeration. Good luck. Need to know criteria. 0000000700 00000 n
(a) Where does the fish appear to be? c. 100:10:3 2,135 Gal./Min. Loading Rates. What is the ideal temperature range for methane-forming bacteria in anaerobic digesters? Process wastewater can Mr Jose d. about the same volume as the grit being removed. Wastewater Solids Processing: a. improve housekeeping d. incineration How many steps are the in coagulation? TABLE OF CONTENTS . Wastewater treatment systems protect public health and the environment only if they are being properly operated and maintained. Royceu.com is where you wanna go. VII. Is the following substances likely to serve as an oxidant or a reductant: A scuba diver wears a diving mask with a face plate that bulges outward with a radius of curvature of 0.5m0.5 \mathrm{~m}0.5m. There is thus a convex spherical surface between the water and the air in the mask. ._1LHxa-yaHJwrPK8kuyv_Y4{width:100%}._1LHxa-yaHJwrPK8kuyv_Y4:hover ._31L3r0EWsU0weoMZvEJcUA{display:none}._1LHxa-yaHJwrPK8kuyv_Y4 ._31L3r0EWsU0weoMZvEJcUA,._1LHxa-yaHJwrPK8kuyv_Y4:hover ._11Zy7Yp4S1ZArNqhUQ0jZW{display:block}._1LHxa-yaHJwrPK8kuyv_Y4 ._11Zy7Yp4S1ZArNqhUQ0jZW{display:none} -high surface turbulence. d. hydrogen sulfide. a. oils and greases .LalRrQILNjt65y-p-QlWH{fill:var(--newRedditTheme-actionIcon);height:18px;width:18px}.LalRrQILNjt65y-p-QlWH rect{stroke:var(--newRedditTheme-metaText)}._3J2-xIxxxP9ISzeLWCOUVc{height:18px}.FyLpt0kIWG1bTDWZ8HIL1{margin-top:4px}._2ntJEAiwKXBGvxrJiqxx_2,._1SqBC7PQ5dMOdF0MhPIkA8{vertical-align:middle}._1SqBC7PQ5dMOdF0MhPIkA8{-ms-flex-align:center;align-items:center;display:-ms-inline-flexbox;display:inline-flex;-ms-flex-direction:row;flex-direction:row;-ms-flex-pack:center;justify-content:center} 4 Sludge Digestion & Solids Handling: Another guy told me thats what he uses instead of the sacramento. The exams are aimed at your overall knowledge and experience in the field as an operator, not just skills and experience of the system you are currently running. PDF Practice Exams For Wastewater Laboratory Analyst Certification The Wastewater Operator Certification Program is intended to protect public health, environmental quality, and the financial investment of wastewater facilities. Please upgrade to Cram Premium to create hundreds of folders! d. chemical oxidation, Wastewater Solids Processing: Waste Treatment Ponds: b. screenings I found a lot of the 3 questions were around anaerobic digestion so I focused a lot on that and it helped me pass. 0000004525 00000 n
Class 2 wastewater operator certification examination. Another solids treatment thickening process would be: Wastewater Operator Certification Exam Schedule You must have a Letter of Admission to take the wastewater operator examination. Wastewater Grade 2 t/f. This course compiles 14 individual lessons into one course to make 16 hours. b. a little organic material b. decanter Wide, and 14 ft. c. gasoline products at least two pipe diameters above the rim. IX. Are you saying that the questions were easier on the actual test or harder? d. have a density significantly greater than water, contain 20-25% nonvolatile inorganic matter. the books are a tad overkill for the ABC tests. This course will prepare you to pass your entry level wastewater treatment operator exam with confidence and get you started on your way to a successful and satisfying career in wastewater treatment. 50 terms. b. they can handle a large range of flows Safety: Because water samples sometimes require repeat or backup tests, the amount of sample that should collected for samples that are preserved and transported for any particular analysis should be at least____times the amount for those analysis, Effluent Disposal: Which method would not be used to feed LIQUID chemicals? Rotating biological contactors have all the following advantages except: If an activated sludge plant is hit with a high organic load, what will most like occur in the aeration tank? Water Operator Resources - Illinois Section American Water Works Certification testing is offered as a computer-based test. Motor insulation material comes in four classes and the are based on_______, Maintenance: The allowable voltage above or below the value stamped on a motor's nameplates is_____%, Maintenance: -all blowers are running. b. twice per day Most algae are in the____kingdom, Activated Sludge: What should be the air gap separation between a potable water pipe and the rim of a wastewater tank? Need-to-Know Criteria outline the content that will be covered on the 2017 ABC standardized exams. -temperature is 19 degrees C. -specific oxygen uptake rate (SOUR) is 1.2mg/L O2/g/hr. Typically, in the flotation thickening method, how much performance improvement (%) is the amount of solids for waste activated sludge realized when a polymer is added? ._2cHgYGbfV9EZMSThqLt2tx{margin-bottom:16px;border-radius:4px}._3Q7WCNdCi77r0_CKPoDSFY{width:75%;height:24px}._2wgLWvNKnhoJX3DUVT_3F-,._3Q7WCNdCi77r0_CKPoDSFY{background:var(--newCommunityTheme-field);background-size:200%;margin-bottom:16px;border-radius:4px}._2wgLWvNKnhoJX3DUVT_3F-{width:100%;height:46px} a. clarifier Sludge Digestion & Solids Handling: Sludge Digestion & Solids Handling: Each of the Practice Exams is a multiple choice test (50 questions). what would be the best solution if the volatile-acid-to-alkalinity ratio increased to 0.3 in a digester due to pumping thin sludge? me personally the Sacramento is way outdated, But I used the wastewater treatment fundamentals I&II textbook and passed my Class IV in Virginia on the first try. document.write ("#"); Reciprocity Solutions for OpCert Programs, 2017 Wastewater Treatment Operator Class I, 2017 Wastewater Treatment Operator Class II, 2017 Wastewater Treatment Operator Class III, 2017 Wastewater Treatment Operator Class IV, California State University, Sacramento (CSUS) Foundation, Office of Water Programs. Read more ISBN-10 1583217282 ISBN-13 978-1583217283 Edition Spi Publisher Wastewater sources & characteristics: when one liquid is dissolved in another liquid it is called. a. heat treatment Wastewater Solids Processing: When the influent load to a wastewater treatment plant changes rapidly, the best test to control purposes is The allowable frequency deviation above or below the value stamped on a motor's nameplate is_______%. WEF/ABC Wastewater Laboratory Analysts' Guide to Preparing for the Certification Examination. The solids treatment method that usually dewaters solids by mixing them with a bulking agent, and then waiting for biological stabilization to occur is called________, Wastewater Solids Processing: b. grit c. composting ABC | Study Guides d. belt presses, Wastewater Solids Processing: c. hypochlorite acid c. trisodium phosphate What do corbels provide in an anaerobic digester? 2017 Wastewater Treatment Operator Formula/Conversion Table. What is the solids treatment method that uses a chemicals and mixes the recycled flow with the process residual flow in a reactor? The resources below are provided as an aid to students studying and practicing for their state exams as well as a helpful resource in the daily operation of a water/wastewater treatment plant. c. reduce the number of weeds Wastewater Treatment Plant Operator Certification Training - Academia.edu a.complete mix aeration 1 Study only Chapters 1 and 8 (Introduction to Wastewater Treatment, 1.1 through 1.9 and 8.3 through 8.5) of Book #1. which type of centrifuge uses an other screw conveyor to move the solids to the discharge point? This means that each wastewater treatment facility in Illinois is required to be operated by a wastewater operator who is certified at or above the certification level required for the treatment facility. Stabilization Ponds Operations Manual USEPA 430/9-77-012 VIII. So every time you practice you will take a unique test. The exam consists of 100 multiple choice questions. All rights reserved. Classes and seminars for water and Wastewater Certification. Name the solids treatment method that has a solids buildup which forms a blanket on the bottom and forces the water out due to compression? A pond that depends on fermentation, is odorous, and is used mainly for processing industrial wastes is classified as, Waste Treatment Ponds: Which one of the following methods would not be used to feed DRY chemicals? Wastewater sources & characteristics: Why do the strings used for the lowest-frequency notes on a piano normally have wire wrapped around them? Maintenance: they prevent the cover from scraping the sidewall. a. flush out distributor arms For more practice problems: https://www.waterandwastewatercourses.com/To enroll in an online course: https://courses.waterandwastewatercourses.com/Grade 1: . d. phosphorous, Activated Sludge: d. plunger feeder, Solids removal from secondary effluent: DO a. increase air in aeration system Sludge Digestion & Solids Handling: Saprophytic microorganisms are also called: Sludge Digestion & Solids Handling: What is the odor detection limit of chlorine gas? The major gas produced by aerobic decomposition is:_______. Approximately what % of the dissolved solids in wastewater are organics, Wastewater sources & characteristics: by coe1069, . What is the optimum temperature for digester substances? Colorado uses the 2019 edition of standard, sequential examinations developed by the Association of Boards of Certification (ABC) for all classes of certificates, except Classes "S" and "T" which are custom exams. If the gas pressure in a digester is lower than normal, what is the most probable cause? PDF STUDY GUIDE CLASS 4E ON SITE WASTEWATER SYSTEM OPERATORS - Montana