HYDROPONIC SYSTEMS · BIOLOGICAL NUTRIENT PREPARATION
Bioponics
Organic starting materials mineralize in a controlled manner, provide plant-available ions and conduct the biological cycle in a stable manner.
ORIENTATION
Content
- 01Definition and classification
- 02System boundary and designs
- 03Material stream: from raw material to plant ion
- 04Components and their actual task
- 05Test starting materials instead of blind doses
- 06Mineralization: Solve nutrients biologically
- 07Nitriding and oxygen demand
- 08Reactor, solids and hydraulic rest
- 09Nutrient profile and typical gaps
- 10Read pH, EC, oxygen and temperature
- 11Construction and biological commissioning
- 12Appropriate cultures and system choice
- 13Operation, refill and balancing
- 14Hygiene and food safety
- 15Error diagnosis: cause before correction
- 16Comparison with hydroponics and aquaponics
- 17Limitations, Law and Organic Labelling
- 18Planning checklist and specialist sources
01Definition and classification
Bioponics is an earthless culture guide in which nutrients from biological starting materials are made available to plants by defined microbial processes. The plant combines plant production with controlled water treatment. The term describes the technique, not automatically a legally permitted organic label.
Planning and operating points
- The plant absorbs predominantly inorganic ions; biological origin does not replace their transformation.
- Processing and plant supply are two coupled but separately testable processes.
- A stable plant therefore requires microbiological and plant management.
02System boundary and designs
From a technical point of view, the separation of processing and culture cycle makes sense. A single-tank system is compact but sensitive to oxygen consumption and solids. A side-flow reactor allows maturation time, settling, ventilation and targeted extraction.
Planning and operating points
- One-tank facilities mix reaction, sedimentation and root supply in the same place.
- A side-flow reactor can be independently aerated, sampled and taken out of service.
- Multi-stage plants are more complex, but offer the highest control over solids and ripeness.
03Material stream: from raw material to plant ion
The source stream must remain measurable and cleanable at each transfer. Untreated solids do not belong in fine NFT channels or spray nozzles. Losses from sludge extraction, harvesting, sampling and water change are accounted for separately.
Planning and operating points
- The brown pathway characterizes organic raw materials and solids.
- The blue path shows clarified, plant-available nutrient solution.
- The green reflux returns residual nutrients without directly connecting the raw material and the harvesting area.
This is how a separate bioponics plant is set up
Legend for beginners
- Brown way
- Organic raw material and solids-rich suspension – exclusively within processing.
- Blue Way
- After weaning and biofilter clarified nutrient solution on the way to reservoir and plants.
- Green dashed path
- return from the plant module to the reservoir; It closes the cultural cycle.
- Green circles
- Biofilter carrier material with a large biologically active surface.
- P in the reservoir
- circulating pump which conveys clarified solution to the plant module.
- Brown triangle
- Settled solids collected in controlled form as sludge.
04Components and their actual task
Reservoir, mineralization reactor, solids separation, biofilter, pump, distributor and culture module each fulfill a hydraulic or biological task. Each solid-conducting site requires controlled movement or controlled deposition.
Planning and operating points
- Containers shall be light-tight, emptied and fully accessible.
- Filters are designed according to particle load and subsequent culture module.
- Sampling and barriers are part of the construction, not the subsequent repair.
Reservoir
accessible, measurable, cleanable and designed for its real process load
Mineralization reactor
accessible, measurable, cleanable and designed for its real process load
Solid deposition
accessible, measurable, cleanable and designed for its real process load
Biofilters
accessible, measurable, cleanable and designed for its real process load
Pump and distributor
accessible, measurable, cleanable and designed for its real process load
Culture module
accessible, measurable, cleanable and designed for its real process load
05Test starting materials instead of blind doses
The nutrient source determines more than NPK: dry matter, salt load, hygiene, degradability and origin change the operation. Plant extracts, fermentation residues and authorised liquid fertilisers shall be documented in batches.
Planning and operating points
- Each batch receives origin, date, analysis and quantity used.
- Fluctuating raw materials are not evaluated exclusively by manufacturer-NPK or EC.
- Unknown contamination, extreme salt cargo or rot preclude direct use.
06Mineralization: Solve nutrients biologically
Heterotrophic microorganisms dissolve organically bound nutrients. The release is not synchronous with the plant requirements. Mature time, surface area, temperature, pH and oxygen determine what actually becomes available as an ion.
Planning and operating points
- Hydrolysis and heterotrophic mineralization release nutrients time-shifted.
- Excessive exposure produces oxygen depletion, foam, odor and incomplete degradation.
- The ripening result is tested analytically before solution enters the plant cycle.
Nitrogen is available in stages
Legend and reading direction
- Organic N
- Still organically bound nitrogen which is not directly available to plants.
- NH4+
- ammonium from mineralisation; high values show load or incomplete further oxidation.
- NO2−
- Nitrite as an unstable intermediate and important process warning signal.
- NO3−
- nitrate as an oxidised nitrogen form predominantly available to plants.
- Arrows
- reading direction of biological conversion; Every step requires suitable microorganisms and oxygen.
07Nitriding and oxygen demand
Ammonium is oxidized to nitrate via nitrite. The communities involved are sensitive to oxygen deficiency, load jumps and inappropriate pH conditions. A good value in the plant basin does not prove that the reactor core is sufficiently supplied.
Planning and operating points
- Ammonium and nitrite spikes are process signals, not normal fertilizer values.
- Biofilter area alone is not sufficient; Flow and oxygen must reach the entire active area.
- After cleaning, temperature change or load jump, the conversion power is confirmed again.
Aerobic reactor and solids zone
Legend and reading direction
- Feed
- Organically loaded liquid enters the reactor in a controlled manner.
- Ventilation
- Oxygen input keeps degradation aerobic and reduces rotting zones.
- Biofilm
- Microorganisms on surfaces convert bound nutrients.
- Settlement
- Heavy, undissolved particles are removed from the further stream.
- Collection
- Sludge is removed in a controlled manner and not carried into the root zone.
08Reactor, solids and hydraulic rest
Hydraulic residence time does not replace biological maturation time. The reactor needs volumes for mixing, gas transfer and sampling; Sediments must remain removable. Bypass and barrier enable maintenance without uncontrolled culture loading.
Planning and operating points
- A calmed settling area must not become an anaerobic dead zone.
- Sludge extraction is defined so that stored nutrients and losses remain accountable.
- The reactor, filters and pipelines are constructed in such a way that all deposit areas are visible or flushable.
09Nutrient profile and typical gaps
Organic sources rarely provide nutrients in proportion to plant needs. Potassium, calcium, magnesium, sulfur or iron may be absent, although nitrogen is abundant. Water analysis, leaf image and plant tissue complement each other.
Planning and operating points
- Total EC can be high while a single essential element is missing.
- Raw material analysis and plant requirements are compared elementally.
- Additions are made only after a proven bottleneck and in compliance with the respective legal framework.
Nutrient supply and needs
Legend and reading direction
- NN
- Nitrogen – important for leaf and shoot growth; Form and release are crucial.
- P
- Phosphorus – energy transfer and root development; can be biologically or chemically bound.
- K
- Potassium – water balance and material transport; Levels of organic sources vary greatly.
- Ca
- Calcium – cell walls and growth points; A high overall EC does not replace it.
- Mg
- Magnesium – central atom of chlorophyll and to be evaluated individually.
10Read pH, EC, oxygen and temperature
EC captures dissolved ions, not the organically bound reserve. pH affects microbes and availability; Dissolved oxygen shows process reserve. Temperature simultaneously changes plant requirements, oxygen solubility and conversion rate. Trends are more important than individual values.
Planning and operating points
- Measurement points are located before and after biological processing and in the culture cycle.
- Calibration, time, temperature and operating state are documented with the measured value.
- Decisions are based on progression, plant response and at least one confirmatory process signal.
Interpreting measurement values together
Legend and reading direction
- pH
- Acid-base location; affects microorganisms and nutrient availability.
- EC
- Electrical conductivity; Captures dissolved ions, not the organically bound reserve.
- O2
- Dissolved oxygen as a process reserve for roots, mineralization and nitrification.
- Temperature
- Affects oxygen solubility, microbial velocity and plant requirements.
- Trend
- measurement curve over time; makes load jumps and creeping disturbances visible.
11Construction and biological commissioning
First, leakage, cleaning and measuring points are tested. After that, the reactor and biofilter run in at a low load. ammonium, nitrite, nitrate and oxygen are monitored; Only after stable conversion does the plant load increase. Changes are made individually and documented.
Planning and operating points
- The first load remains well below the planned final load.
- Plants are only used when conversion and clarity are reproducible.
- The start-up shall be in stages; Each stage must remain stable under real transformation.
12Appropriate cultures and system choice
Robust leaf cultures and herbs are better suited for testing than strong fruiting long-term crops. Substrate systems often buffer solids and fluctuations better than narrow channels. The system selection follows raw material and cleanability.
Planning and operating points
- Substrate-based systems usually tolerate particles better, but must remain completely flushable.
- NFT and aeroponics require a particularly clear solution and reliable prefiltration.
- Culture choice takes into account life, nutrient requirements, root mass and hygienic risk.
13Operation, refill and balancing
It is refilled according to water and nutrient balance, not according to EC alone. Daily levels, pump, oxygen, smell and roots are checked. Sludge discharge, line inspection and analysis follow periodically.
Planning and operating points
- Fresh water replaces water loss, but not automatically extracted nutrients.
- Raw material addition depends on measured withdrawal and available mineralization capacity.
- Filter cleaning and sludge extraction are documented as material discharge.
14Hygiene and food safety
Unclear residues, animal by-products or untreated waste water are not improvised fertilisers. Raw material release, treatment, separate clean and dirty areas and harvest hygiene form a barrier chain.
Planning and operating points
- Raw material acceptance and harvesting are spatially and organisationally separated.
- Spray water, aerosols and hand contact shall not form an abbreviation through the barrier chain.
- Cleaners and processes must be compatible with materials and suitable for the food sector.
Hygiene barriers
Legend and reading direction
- Raw material
- Only released and documented starting materials enter the processing.
- Reactor
- Mineralization separates organic cargo from immediate irrigation.
- Filters
- Solids are retained from sensitive pipes and roots.
- Watering
- Only a sufficiently clarified and tested solution reaches the culture.
- Harvest
- Clean hands, tools and surfaces form the last hygiene barrier.
15Error diagnosis: cause before correction
A foul odor first leads to testing of load, oxygen and dead zones. Rising nitrite requires control of nitrification, pH and load jump. Lack despite EC requires individual ion testing. Never change several manipulated variables at the same time.
Planning and operating points
- First, the location of the problem is narrowed down: reactor, filter, reservoir or root zone.
- Flow rate, oxygen, nitrogen forms, pH, temperature and visible deposits are then tested.
- After a single correction, a fixed observation time follows before further intervention.
Three circuits in comparison
Legend and reading direction
- Mineral hydroponics
- Direct supply of largely defined mineral salts.
- Bioponics
- Microbial mineralization of organic sources before or in the cycle.
- Aquaponics
- Fish farming and feeding produce the nutrient stream; Animal welfare expands the system boundary.
- System boundary
- Specifies which substances, organisms and processing steps belong to it.
- Balance sheet
- Compare entries with harvest, sludge, water change and other discharges.
16Comparison with hydroponics and aquaponics
Mineral hydroponics predominantly doses directly available salts. Bioponics complements the microbial conversion of organic sources. Aquaponics also couples animals, feeding and animal welfare to the plant cycle.
Planning and operating points
- Bioponics shifts part of the fertilizer feed into a biological reactor.
- Compared to aquaponics, there is a lack of fish farming and feed balance, but not mineralization and biofiltration.
- Compared to mineral hydroponics, biological variability and thus the need for control increases.
From Symptom to Cause
Legend and reading direction
- Symptom
- Visible deviations such as odor, cloudiness, deficiency or increasing nitrite.
- Measurement
- Confirms the problem with flow, water or substance data.
- Source stream
- Limits the container or transfer point at which the deviation occurs.
- Cause
- proven technical, biological or material source of error.
- Correction
- Targeted individual measure with observation time and success monitoring.
17Limitations, Law and Organic Labelling
In the EU, hydroponic production for organic plant production is generally not permitted under Regulation (EU) 2018/848. In the US, hydroponic operations can be certified under the USDA-NOP if all requirements are met. Technology, location and certification shall be identified separately.
Planning and operating points
- The technical designation shall not be used as a certification statement.
- Allowed inputs, labelling and marketing are checked before plant construction for the target market.
- Testing, self-supply and commercial marketing may be subject to different obligations.
18Planning checklist and specialist sources
Prior to implementation, raw material status, reactor, solids conduction, oxygen reserve, nutrient gaps, cleaning, hygiene barriers and incident plan are released in writing. Example values are not universal system values; is designed for specific operation.
Planning and operating points
- Removable is only a documented overall process, not a collection of functioning individual parts.
- The checklist is supplemented with responsible persons, audit evidence and release date.
- Open points remain visible and are not replaced by flat-rate experience values.
Specialist sources
- Szekely & Jijakli: Bioponics – Review
- Gartmann et al. Closed-loop bioponics
- USDA-ARS: Organic fertilizer across hydroponic systems
- EU Regulation 2018/848
- USDA NOSB: Hydroponics and Bioponics
- Park et al. Organic hydroponics – Review
- McClintic et al. Organic fertilizers
- Hooks et al.: Microbial inoculation
- Chowdhury et al. Organic lettuce systems
- USDA ERS: Innovative production
- USDA NOP: Container standards
- EUR-Lex: Hydroponic organic production