Ecomondo 2010 Transnational Workshop Efficient management of water

Ecomondo 2010 Transnational Workshop: Efficient management of water resources Rimini, 4 th November 2010 “AUTOMATIC ANALYSER FOR BIOLOGICAL ACTIVITY MONITORING: EXPERIMENTATION IN CIVIL WASTE WATER TREATMENT PLANT WHICH TREATS LEACHATE” Ing. Francesco Ciappelloni

SPES Società di Progettazione Elettronica e Software www. spesonline. com

SPES Business Unit SPIN System & Process Integration www. spesonline. com Environment Systems Industry Energy

INTRODUCTION Application field Activated sludge waste water treatment plants Aim Biological process monitoring and control Features Automated sampling and execution of biochemical analysis in batch reactor

TITAAN (TITration Automatic ANalyser) Device that execute, automatically and continuously, batch analysis to assess biological processes parameters. PERIODIC MONITORING OF SLUDGE ACTIVITY REAL TIME WARNING Nitrogen removal rate Leachate toxicity Overloads Inhibition risk Residual capacity ALARMS FEEDBACKS REMEDIES Chemicals dosing Energy saving Intervention request

TITAAN (TITration Automatic ANalyser) 1) COMPUTING UNIT hardware and software applications 2) ANALYSIS AND SAMPLING UNIT reactor, hydraulic circuits and load/discharge valves 3) CHEMICALS STORAGE AND DOSING UNIT chemicals tanks, peristaltic pumps and electrovalves DIMENSION: 100 cm (W) x 50 cm (D) x 170 cm (H)

TITAAN (TITration Automatic ANalyser) Computing unit q software applications for instrument control q data acquisition and storage in database q remote connection through web server q interface with external actuators to manage controls on the plant

TITAAN (TITration Automatic ANalyser) PLT_Line Technology Browser web connection to the devices

TITAAN (TITration Automatic ANalyser) Analysis and sampling unit q reactor for analysis execution q temperature control system q circuit of influent and sludge loading and discharging q influent and sludge tanks equipped with mixer and aerators

TITAAN (TITration Automatic ANalyser) Chemical storage and dosing unit The dosing system is composed by peristaltic pumps and mircoelectrovalves. q 4 dosing lines for reagents q 4 dosing lines for titrants q temperature is continuously controlled

SET-POINT TITRATION Nitrogen biological removal Autotrophic biomass (aerobic condition) NH 4+ O 2 DO-Stat Balanced by H 2 O 2 NO 2 NO 3 - H+ p. H-Stat Balanced by Na. OH

p. H-DO Stat TEST p. H and DO signals

p. H-DO Stat TEST Na. OH and H 2 O 2 cumulative volume

TITAAN IN HERA WWTP 75. 000 PE – 2 lines 1. Sewage incoming 4. Nitrification 2. Pretreatments 5. Secondary settling 3. Denitrification 6. Effluent 4 3 ∙ 2 1 5 6

VALIDATION PROTOCOL Activities conducted in agreement with HERA LABORATORY ANALYSIS (HERA lab in Forlì) Ammonia, nitrites and nitrates concentration of samples taken from Titaan reactor in different times during experiment execution NH 4+ consumption rate NO 2 - and NO 3 - buildup rate TITAAN TESTS Provide sludge nitrifying activity as mg. N-NH 4/L

VALIDATION PROTOCOL Maximum deviation between Titaan activity value and Lab ammonia consumption rate: 85% 115% TITAAN activity extimation has been considered acceptable

TITAAN IN HERA WWTP AOB_DO 20°C April – October

INHIBITION TEST OBJECTIVES OF TITAAN TESTS • To quantify leachate loading impact on sludge maximum nitrifying activity • To provide plant management support • To assess residual treatment capacity

INHIBITION TEST CONDITIONS Leachate volume 20 ml Sludge volume 1200 ml Total volume 1220 ml Leachate/sludge ratio 1: 60 Test duration 180 min Leachate dosage instant ATU dosage instant 60 min 140 min

INHIBITION TEST RESULTS AOB activity (p. H stat curve) Mean AOB activity before leachate dosing [mg. N/(L∙h)] Mean AOB activity after leachate dosing [mg. N/(L∙h)] Mean AOB activity inhibition [%] 5. 6 ± 0. 94 4. 1 ± 1. 0 27 AOB activity (DO stat curve) Mean AOB activity before leachate dosing [mg. N/(L∙h)] 4. 2 ± 0. 76 Mean AOB activity after leachate dosing [mg. N/(L∙h)] 3. 0 ± 0. 63 Mean AOB activity inhibition [%] 28

TITAAN IN HERA WWTP Daily scheduler User can program different schedulers Test to be executed Daily time of start test

TITAAN IN HERA WWTP Operativity percentage Total tests = 550 87% Successfully tests 6% No p. H setpoint 3% No DO setpoint 2% Problems of power supply 2% Technical problems

TITAAN IN HERA WWTP ORDINARY MAINTENANCE Monthly ordinary maintenance: q electrochemical sensors cleaning and calibration q electrovalves calibration q chemicals replacement CHEMICALS USED FOR TITAAN TEST q Hydrogen peroxide 0, 2 M q Sodium hydroxide 0, 2 M q Ammonium Chloride 1 g N-NH 4/L q Allylthiourea (nitrification inhibitory) 1 g/L

THANK YOU FOR YOUR ATTENTION For further information: Hall C 1 Stand 076 www. spesonline. com francesco. ciappelloni@spesonline. com