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Expert answers to the most common questions about biogas plants, organic waste converters, sewage treatment plants, and Bio-CNG systems in India.

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Frequently Asked Questions

Answers to common questions about biogas, organic waste converters, sewage treatment, and Bio-CNG — from BIOPOWER engineers.

Browse FAQs by category below. For project-specific questions, request a free site assessment — our team responds within 48 hours with capacity recommendations and ROI estimates.

FAQs

Biogas FAQs

What is a biogas plant and how does it work?
A biogas plant uses anaerobic digestion — bacteria breaking down organic waste in an oxygen-free environment — to produce methane-rich biogas. The gas is captured and used for cooking, heating, or power generation. Digestate left after digestion is nutrient-rich organic manure.
What waste can be fed into a biogas plant?
Kitchen food waste, canteen scraps, fruit and vegetable trimmings, dairy waste, and agricultural residue work well. Avoid large bones, coconut shells in excess, and non-organic contaminants like plastic and metal.
How much does a biogas plant cost in India?
Portable plants from 1–100 kg/day start from approximately ₹40,000. Commercial and institutional plants from 125 kg/day to several metric tons per day are custom-quoted based on capacity, civil work, and gas utilisation equipment.
Is government subsidy available for biogas plants?
MNRE and state nodal agencies periodically offer capital subsidy for community and institutional biogas under active scheme notifications. Eligibility depends on plant size and applicant category — verified during BIOPOWER site assessment.
How long does biogas plant installation take?
Portable units: 2–5 days. Commercial and institutional plants: 4–10 weeks including civil foundations, piping, and commissioning.
FAQs

OWC FAQs

What is an organic waste converter (OWC)?
An OWC is an enclosed machine that uses accelerated aerobic composting to convert segregated food waste into mature compost within 24–48 hours through controlled temperature, moisture, and agitation.
OWC vs biogas — which should my apartment choose?
OWC produces compost quickly without gas piping — ideal for RWAs focused on waste diversion. Biogas generates cooking energy from the same waste. Some large communities install both for different waste streams.
How much space does an OWC need?
A 250 kg/day OWC typically needs 15–25 sq.m including loading area and ventilation. Larger units for hotels and townships need 30–60 sq.m.
Can OWC compost be used in gardens?
Yes. Properly processed OWC output is suitable for landscaping, terrace gardens, and agricultural use. Some properties bag excess compost for resident distribution or nursery sale.
What is the operating cost of an OWC?
Electricity for heating and agitation is the primary O&M cost — typically ₹3–8 per kg of waste processed. BIOPOWER AMC contracts cover periodic maintenance and parts.
FAQs

STP FAQs

Is STP mandatory for apartments in Karnataka?
Yes. New projects require functional STP for occupancy certificates. Existing communities facing KSPCB notices must install or upgrade STP to meet discharge or reuse standards.
What STP technology is best for apartments?
MBBR and SBR packaged plants are most common for apartments — compact footprint, stable performance, and manageable operator requirements. MBR suits projects needing higher reuse quality.
Can STP treated water be used for toilet flushing?
Yes. Treated water meeting KSPCB reuse standards is widely used for toilet flushing and landscaping — reducing freshwater demand 30–40% in water-scarce cities like Bengaluru.
What size STP does a 300-flat apartment need?
Approximately 80–120 KLD depending on occupancy, per-capita consumption, and reuse goals. BIOPOWER sizes STP after flow measurement and occupancy assessment.
What is the STP operating cost?
Electricity, chemicals, and sludge handling typically cost ₹8–15 per kilolitre treated. Water reuse savings often exceed O&M costs in tanker-dependent communities.
FAQs

CBG FAQs

What is Bio-CNG / CBG?
Compressed Biogas (CBG) is biogas upgraded to 95%+ methane content, compressed to high pressure, and used as vehicular or industrial fuel — equivalent to conventional CNG but produced from organic waste.
What feedstock suits CBG plants?
Food processing waste, press mud, cattle dung, poultry litter, and municipal segregated wet waste. Consistent daily volume and pre-treatment are critical for stable upgrading.
What is the minimum scale for viable CBG?
Most viable CBG projects start at 5–10 MT/day organic feedstock or equivalent effluent load. Smaller installations may produce raw biogas for on-site boiler use without full upgrading.
What is SATAT and how does it relate to CBG?
SATAT (Sustainable Alternative Towards Affordable Transportation) is a government initiative encouraging CBG production and offtake through oil marketing companies — providing market access for larger CBG projects.
Can CBG integrate with existing effluent treatment?
Yes. Anaerobic digesters can be added upstream of aerobic ETP stages — capturing biogas while reducing COD load on downstream treatment, lowering aeration energy and sludge volume.

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Helpful Resources

ResourcesResource CenterBiogasBiogas KarnatakaOWCOWC KarnatakaSTPSTP KarnatakaCBGBio-CNG Karnataka