{"id":2318,"date":"2024-10-21T12:55:48","date_gmt":"2024-10-21T12:55:48","guid":{"rendered":"https:\/\/sensaratech.com\/aeration-control-of-the-biological-process-of-the-martorell-wwtp-by-means-of-on-line-respirometry\/"},"modified":"2026-10-14T10:18:39","modified_gmt":"2026-10-14T10:18:39","slug":"aeration-control-of-the-biological-process-of-the-martorell-wwtp-by-means-of-on-line-respirometry","status":"publish","type":"post","link":"https:\/\/sensaratech.com\/en\/aeration-control-of-the-biological-process-of-the-martorell-wwtp-by-means-of-on-line-respirometry\/","title":{"rendered":"Martorell WWTP: less nitrogen to the Llobregat with 14 % less aeration energy"},"content":{"rendered":"<style> .snr{--g:#7cb955;--gd:#4e8f2a;--ink:#1d2a14;--tx:#3f444b;--soft:#f2f8ee;--line:#e2ead9;font-family:Sora,Arial,sans-serif;color:var(--tx);line-height:1.6;font-size:16px;max-width:1140px;margin:0 auto;padding:0 16px} .snr *{box-sizing:border-box} .snr h1,.snr h2,.snr 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.step:before{counter-increment:s;content:counter(s);display:inline-flex;width:34px;height:34px;border-radius:50%;background:var(--g);color:#fff;font-weight:600;align-items:center;justify-content:center;margin-bottom:12px} .snr .card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:26px} .snr .bars{display:flex;align-items:flex-end;gap:14px;height:240px;padding:0 4px;position:relative;border-bottom:2px solid var(--ink);margin-top:34px} .snr .bar{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;position:relative;z-index:1} .snr .bar i{display:block;width:100%;max-width:64px;border-radius:10px 10px 0 0;background:#c9d6bf} .snr .bar.on i{background:var(--g)} .snr .bar em{font-style:normal;font-size:13px;font-weight:600;color:var(--ink);margin-bottom:6px} .snr .xlab{display:flex;gap:14px;padding:8px 4px 0} .snr .xlab span{flex:1;text-align:center;font-size:13px} .snr .limit{position:absolute;left:0;right:0;border-top:2px dashed #c0392b;z-index:2} .snr .limit span{position:absolute;right:0;top:-24px;font-size:12px;color:#c0392b;font-weight:600;background:#fff;padding:0 4px} .snr .legend{display:flex;gap:18px;font-size:13px;margin-top:12px;flex-wrap:wrap} .snr .legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:6px;vertical-align:-1px} .snr .compare{display:grid;grid-template-columns:1fr 1fr;gap:0;border-radius:18px;overflow:hidden;border:1px solid var(--line)} .snr .compare>div{padding:24px} .snr .compare .before{background:#f6f6f4} .snr .compare .after{background:var(--soft)} .snr .compare h3{font-size:14px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px} .snr .quote{background:var(--ink);color:#fff;border-radius:18px;padding:32px 36px;font-size:clamp(18px,2.2vw,24px);line-height:1.45} .snr .quote b{color:#a6dd7c;font-weight:600} .snr .cta{background:var(--g);border-radius:24px;padding:36px 40px;display:flex;justify-content:space-between;align-items:center;gap:24px;margin:40px 0 56px;color:var(--ink)} .snr .cta h2{margin:0 0 6px} .snr .cta p{margin:0;max-width:640px} .snr .btn{display:inline-block;background:var(--ink);color:#fff!important;text-decoration:none!important;border-radius:30px;padding:14px 28px;font-weight:600;white-space:nowrap} .snr .note{font-size:12px;color:#7a7f86;margin-top:10px} @media(max-width:860px){.snr .kpis{grid-template-columns:1fr 1fr}.snr .grid2,.snr .compare{grid-template-columns:1fr}.snr .steps{grid-template-columns:1fr}.snr .cta{flex-direction:column;align-items:flex-start;padding:28px}.snr .bars{gap:8px}} <\/style> <div class=\"snr\"> <div class=\"hero\" style=\"padding-top:8px\"> <p class=\"lead\">The SN8 online respirometer and the SICAIR algorithm aerate according to the real demand of the biomass, not a fixed oxygen setpoint.<\/p> <div class=\"chips\"><span class=\"chip\">Barcelona, Spain<\/span><span class=\"chip\">61,250 p.e.<\/span><span class=\"chip\">10,500 m\u00b3\/day<\/span><span class=\"chip\">C, N and P removal<\/span><span class=\"chip\">SN8 + SICAIR<\/span><\/div> <\/div> <div class=\"kpis\"> <div class=\"kpi\"><b>\u221214&nbsp;%<\/b><span>aeration energy vs. dissolved-oxygen probe control<\/span><\/div> <div class=\"kpi\"><b>\u221223&nbsp;%<\/b><span>total nitrogen in effluent (from 11.8 to 9.1 mg\/L on average)<\/span><\/div> <div class=\"kpi\"><b>87&nbsp;%<\/b><span>total nitrogen removal efficiency (previously 77&nbsp;%)<\/span><\/div> <div class=\"kpi\"><b>+40&nbsp;%<\/b><span>more influent nitrogen treated, with better effluent quality<\/span><\/div> <\/div> <section class=\"grid2\"> <div><div class=\"eyebrow\">The challenge<\/div><h2>Compliant, but at the limit<\/h2> <p>Martorell WWTP discharges into the Llobregat river, a sensitive area that requires carbon, nitrogen and phosphorus removal. The plant was compliant, but total nitrogen in the effluent was too close to the 15&nbsp;mg\/L discharge limit.<\/p> <p>Aeration controlled by oxygen probes with a fixed setpoint ignored what really matters: <b>how much oxygen the bacteria need at each moment<\/b>.<\/p><\/div> <div class=\"compare\"> <div class=\"before\"><h3>Before<\/h3><ul class=\"check\" style=\"filter:grayscale(1)\"><li>Fixed oxygen setpoint<\/li><li>Aeration with peaks and troughs<\/li><li>Total N close to the limit<\/li><\/ul><\/div> <div class=\"after\"><h3>With SICAIR<\/h3><ul class=\"check\"><li>Air matched to real biomass demand<\/li><li>Balanced, stable aeration<\/li><li>Lower, more stable total N<\/li><\/ul><\/div> <\/div> <\/section> <section> <div class=\"eyebrow\">The solution<\/div><h2>Measure the biology and aerate accordingly<\/h2> <div class=\"steps\"> <div class=\"step\"><h3>Measure<\/h3><p>The <b>SN8<\/b> respirometer analyses the sludge automatically 24\/7: overall activity (OUR\/SOUR) to detect rain events, overloads or toxicity, and nitrification rate (AUR) to know how much ammonium the biomass can remove.<\/p><\/div> <div class=\"step\"><h3>Calculate<\/h3><p><b>SICAIR<\/b> turns that activity into the oxygen the process needs and the blower minutes for each cycle, adapting automatically to rain and overloads.<\/p><\/div> <div class=\"step\"><h3>Control<\/h3><p>The setpoint reaches the plant SCADA via Modbus, with two-way communication. If anything goes wrong, the plant automatically falls back to probe control: it is never left without control.<\/p><\/div> <\/div> <\/section> <section class=\"grid2\"> <div><div class=\"eyebrow\">Results<\/div><h2>Total nitrogen in effluent (mg\/L)<\/h2> <p>Annual averages from plant operating data. Since SN8 + SICAIR was implemented (2022\u20132023), effluent total nitrogen has fallen and stabilised, <b>even though the influent nitrogen load rose by around 40&nbsp;%<\/b>.<\/p> <ul class=\"check\"><li>Effluent nitrate: from 5.3 to 2.4 mg\/L on average (\u221256&nbsp;%)<\/li><li>Total nitrogen removal efficiency: from 77&nbsp;% to 87&nbsp;%<\/li><li>More balanced aeration, without peaks and troughs, and more stable biomass<\/li><\/ul><\/div> <div class=\"card\"> <div class=\"bars\"><div class=\"limit\" style=\"bottom:93.8%\"><span>Discharge limit 15 mg\/L<\/span><\/div><div class=\"bar\"><em>13.3<\/em><i style=\"height:83.1%\"><\/i><\/div><div class=\"bar\"><em>12.1<\/em><i style=\"height:75.6%\"><\/i><\/div><div class=\"bar\"><em>10.3<\/em><i style=\"height:64.4%\"><\/i><\/div><div class=\"bar\"><em>11.3<\/em><i style=\"height:70.6%\"><\/i><\/div><div class=\"bar on\"><em>9.1<\/em><i style=\"height:56.9%\"><\/i><\/div><div class=\"bar on\"><em>9.1<\/em><i style=\"height:56.9%\"><\/i><\/div><\/div> <div class=\"xlab\"><span>2019<\/span><span>2020<\/span><span>2021<\/span><span>2022<\/span><span>2023<\/span><span>2024<\/span><\/div> <div class=\"legend\"><span><i style=\"background:#c9d6bf\"><\/i>Probe control<\/span><span><i style=\"background:#7cb955\"><\/i>With SN8 + SICAIR<\/span><\/div> <\/div> <\/section> <section> <div class=\"quote\">Same plant, higher influent load: <b>less nitrogen to the river and 14&nbsp;% less aeration energy<\/b>. The difference is measuring the biology instead of assuming it.<\/div> <\/section> <section class=\"grid2\"> <div><div class=\"eyebrow\">What&#8217;s next<\/div><h2>SICAIR 3.0: from reacting to anticipating<\/h2> <p>In 2026 Martorell added <b>SICAIR 3.0<\/b>: a proprietary machine learning model, trained on years of the plant&#8217;s own respirometry data, that anticipates the biological demand of the next cycle.<\/p><\/div> <div><div class=\"eyebrow\">Project<\/div><h2>In partnership<\/h2> <p>Project developed by SENSARA with RUBATEC and the Catalan Water Agency (ACA), with integration by INCONEF.<\/p><\/div> <\/section> <div class=\"cta\"><div><h2>What is happening in your reactor?<\/h2><p>We install the SN8 respirometer at your plant as a <b>trial with purchase option<\/b>: if you are convinced, it stays; if not, we remove it.<\/p><\/div><a class=\"btn\" href=\"https:\/\/sensaratech.com\/en\/contact\/\">Request a trial<\/a><\/div> <p class=\"note\">Effluent quality data: annual averages from plant operating analyses, 2019\u20132024. Energy saving calculated against the period of dissolved-oxygen probe control.<\/p> <\/div>","protected":false},"excerpt":{"rendered":"<p>SN8 + SICAIR at Martorell WWTP: \u221214 % aeration energy and \u221223 % effluent total nitrogen, with 40 % more influent 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