ONLY IN INDIA "ZLD" Zero liquid discharge ETP is strictly implemented. And some parts of China .ZLD in India is mandate-driven, not market-driven.

 

ONLY IN INDIA "ZLD" Zero liquid discharge ETP is strictly implemented. And in one area of China. ZLD in India is mandate-driven, not market-driven.

Please read on.

Financial Feasibility of Zero Liquid Discharge (ZLD) ETPs in India

A Regulatory-Driven Cost Framework — Seminar Brief

Core thesis: ZLD in India is mandate-driven, not market-driven. It rarely clears a conventional ROI test — feasibility is a function of regulatory compliance, not payback period.

1. Why ZLD Is Mandated, Not Chosen

•     Sectoral trigger — CPCB/SPCB mandate ZLD for specific “red category” sectors: textile/dyeing, distillery, tannery, pharma bulk drugs, and increasingly pesticide/chemical units and slaughterhouses in water-stressed belts.

•     Reframed decision — The governing question shifts from “should we build ZLD” to “how do we make a mandatory system cost-efficient.”

•     Real payback source — Payback rarely comes from freshwater savings in low-water-cost regions. It comes from avoiding CTE/CTO denial, avoiding NGT fines/closure, and meeting export-market ZLD certification for textile buyers.

2. 2026 Cost Benchmarks

Parameter	Conventional ETP	ZLD
Capex	₹60,000–₹2,00,000 / KLD	~3× conventional
500 KLD plant cost	₹1.5–4 crore	₹6–12 crore
Specific energy (100 KLD)	0.5–1.5 kWh/m³	80–100 kWh/m³ (50–100×)
MVR vs MEE opex (new installs >100 KLD)	MEE = baseline	MVR ~50–60% lower opex than MEE

Energy, not capital, is the dominant lifecycle cost driver — concentrating dissolved solids to crystallization is thermally intensive.

3. Global Regulatory Comparison

•     Headline — Almost no country besides India mandates ZLD at scale; most use a tiered discharge hierarchy instead.

•     EU — EU: Secondary + nutrient-removal treatment under the Urban Wastewater Directive; industrial effluent is pretreated and co-treated at municipal plants. ZLD only in niche toxic/water-stressed cases.

•     USA — USA: EPA NPDES sets technology-based effluent limits (BAT/BPT); discharge to receiving waters under numeric limits. ZLD used narrowly (flue-gas desulfurization, some arid-basin oil & gas).

•     China — China: Comparable water stress to India; ZLD mandated only for coal chemical/coal-to-olefins plants in arid northwest China with no receiving water body nearby.

•     Middle East — Gulf states: Deep-well injection and solar evaporation ponds substitute for MEE/MVR capex, since land is cheap.

•     SE Asia — SE Asia / developing world: Conventional biological ETP with discharge to sewer/watercourse, often under weaker enforcement than CPCB/SPCB.

•     Why India differs — India and arid inland China are the outliers, because India's ZLD-mandated clusters (Tamil Nadu/Gujarat textiles, distilleries, tanneries) sit on inland rivers or groundwater-stressed belts with near-zero assimilative capacity — unlike coastal/river-rich zones elsewhere.

4. Slaughterhouse Wastewater: A Global Outlier Case

•     Global norm — Worldwide, slaughterhouse effluent is treated and discharged, not zero-discharged. India's Nuh/Mewat ZLD mandate is an outlier, not the global norm.

Typical international treatment train

–    Screening + DAF (dissolved air flotation) — strips fat/oil/grease and blood solids, often with blood meal/tallow recovery as revenue.

–    Anaerobic pretreatment (UASB) — reduces high COD/BOD ahead of aerobic polishing, with methane/biogas recovery as a co-benefit.

–    Aerobic biological polish (ASP / MBBR / SBR / MBR).

–    Discharge to sewer (pretreatment surcharge) or to a water body under permit.

Regulatory stringency ranking

•     Strictest — Canada is stricter than the EU, Australia/NZ, or USA despite having no dedicated meat-processing regulation.

•     Mid-tier — Australia, NZ, USA use a co-regulatory model — industry and regulator jointly manage risk.

•     Emerging economies — India, China, Colombia sit at the less-strict end, with sector-specific legislation calibrated to effluent strength — the same CPCB/SPCB category logic used in Envo's DPR work.

Why India still pushes ZLD for slaughterhouses

•     Not a technical driver — Not because the waste stream is harder to treat — slaughterhouse effluent (high BOD/COD/FOG, moderate TDS) is actually easier and cheaper to bring to ZLD-ready quality than textile or pharma effluent.

•     Actual driver — It is because raw effluent often arrives many multiples over permissible limits, Nuh/Mewat has no legal surface-water outlet with assimilative capacity, and NGT/CGWA scrutiny on groundwater-stressed blocks is intense — so ZLD becomes the only defensible compliance posture.

•     Cost implication — Design implication: lower TDS means smaller RO reject volume feeding the MEE/evaporator, so slaughterhouse ZLD capex/opex should sit toward the lower end of per-KLD bands, not the high-TDS textile premium tier.

5. Karnal Technology vs MVR — Decision Framework

Criterion	Karnal Technology (Bio-drainage)	MVR
Mechanism	Evapotranspiration + controlled percolation via plantation over subsurface drains	Mechanical vapor recompression → dry salt cake (true thermal ZLD)
Best fit	Moderate-TDS, high-organic effluent — matches slaughterhouse waste well	Saline/toxic effluent, or genuine land constraints
Capex/Opex	Far lower — no evaporator/crystallizer; only irrigation pumping load	High; 3–5× premium over bio-drainage, though ~50–60% cheaper opex than MEE
Constraint	Land-hungry (~106 KLD/ha benchmark from the 233 KLD / 2.19 ha reference project); seasonal ET variation needs monsoon surge capacity	High energy draw; requires hazardous-waste handling of salt cake
Regulatory standing	Accepted by CGWA/HSPCB on prior projects, but framed as disposal/reuse within a water balance — not a certified “ZLD” output	Unambiguous — dry solids as hazardous waste per CPCB norms

Selection logic for Nuh/Mewat-type sites

•     Plantation land available + CGWA category not most-severe → Karnal Technology is the financially rational choice.

•     Land genuinely scarce, or HSPCB insists on certified zero-discharge → MVR-based ZLD, accepting the 3–5× cost premium.

•     Hybrid model (recommended default): biological ETP → bio-drainage for bulk volume + a smaller MVR unit sized only for peak/monsoon excess. Keeps capex near Karnal-Technology levels while giving HSPCB a hard zero-discharge guarantee for the residual stream.

6. Key Takeaways for DPR / Feasibility Sections

•     State explicitly that the commercial case is regulatory-compliance-driven cost minimization, not classic ROI — pre-empts PCB reviewer queries.

•     Flag that slaughterhouse ZLD costs should not be assumed to scale like textile ZLD, given the lower-TDS effluent character.

•     Consider proposing a UASB/anaerobic pretreatment stage ahead of the biological train where energy cost dominates OPEX — it cuts COD load before the energy-intensive stages, offsetting blower/evaporator draw.

•     For Karnal Technology proposals, keep the framing distinction clear: it is a disposal/reuse mechanism within a water balance, not a certified ZLD train — some reviewers expect a hard ZLD certification.

CHATGPT PROMP FOR SEARCHING ANSWER FOR ETP STP BIO GAS DESIGN

 

CHATGPT PROMP FOR SEARCHING ANSWER FOR ETP STP BIO GAS DESIGN 

1. You are an expert on environmental engineering subjects and gave me clear, direct and natural answers before like a high IQ human without using dash hyphan etc while answering.

 2. Use during answering ,  problem solver (Generator), the judge (verifier) and auditor of the judge ( meta verifier) method. 

3.Base your answer from  standard guidelines with full citations and page numbers to follow Indian govt and cpcb rules, norms and regulation. Also use phe manual and mtcalf eddy as reference while giving solutions.

4. If you do not find the answer, information, say you can't find the answer. It is okay to say NO.If you can not validate, say this information is unverified.

5. Give for each information, source,citation ,reference,page number etc for verification as on date of asking the question. Give answer on latest information.

6. You are a good Tutor helping me learn new concepts, Explain everything in simple language with real world analogies. After each explanation give me one question to check me if I understood. If I got wrong , explain in a different way.Each subsequent question is informed by your previous answer. Never ask more then four questions.

 7. Always check my previous prompts and conversation history .

8. Rescan your answer and validate . .

8. My question :

COMPARISION AMONG ASP, MBBR, SBR AND MBR

 

COMPARISION AMONG ASP, MBBR, SBR AND MBR 

 

Technology	ASP	MBBR	SBR	MBR
Aeration Unit	Needs a Big Aeration Tank with surface aerators or diffused aeration.	Floating media is used providing a surface for microbial growth	Operates in batch where waste water is added to the reactor, treated and discharges.	Normal biological treatment like MBBR
Settling Unit	Uses a Common circular Settling Tank	A tube settler is used for high sludge removal rate.	NIL	Membrane filtration process in place of Settler.
Efficiency	Average Efficiency	High Treatment efficiency. Robust against fluctuation flow and load	Flexibility in Treatment. High Nutrient removal	Superior effluent quality due to membrane barrier.
Area	Largest Area	Most compact system	Requires less area than ASP	50% less area then SBR
Uses	Used in Municipal waste water treatment plant	Used in Decentralized waste water treatment plant and Industries.	Suitable for smaller STP. It has some constraints in Municipal waste water treatment plant	Used in Decentralized waste water treatment plant and Industries, especially when plant is to be designed for zero discharge.
Cost	Medium Cost EASY TO MAINTAIN	Lowest capital and maintenance cost, EASY TO MAINTAIN	High maintenance cost	High Energy Load, Maintenance cost 20% lower than SBR

 

ALUM dosing AND POLY DOSING IN ETP

 ALUM DOSING AND POLY DOSING IN ETP

                                         DOSING FOR ETP

Bleaching powder dosing for disinfection in waste water treatment plant

Bleaching powder dosing for disinfection in waste water treatment plant

Sources of Informations given below
Manual  http://cpheeo.gov.in/upload/uploadfiles/files/Chapter%206-9.pdf

1. https://www.epa.ie/pubs/advice/drinkingwater/Disinfection2_web.pdf
2.http://jeb.co.in/journal_issues/200710_oct07/paper_04.pdf

 The pilot scale disinfection units located at two different UASBR based STPs have been selected for this study. One of these pilot plants has been constructed after 27 MLD UASBR based STP, Noida (Uttar Pradesh, India) and is based on chlorination using calcium hypochlorite (either slurry form or liquid high test hypochlorite, HTH) with a capacity of 2 million liter per day (MLD). The other 1 MLD DHS-biotower pilot plant, developed by Prof. H. Harada (Machdar et al., 1997), is based on fixed film aerobic process and has been constructed after 40 MLD UASBR based STP, Karnal (Haryana, India). These STPs, based on UASBR technology, consists of preliminary treatment (Screen and Grit Chamber), UASBR and final polishing pond (Fig. 1). A schematic diagram of the pilot plants at Noida and Karnal is presented in Fig. 2 and 3 respectively. The chlorination unit of 2 MLD consists of a sump, mixing unit and baffled contact chamber (3m x 7m) and a specific dose of chlorine was mixed with a separate pipe. The 1 MLD DHS-biotower based on fixed film aerobic process consists of a sump and reactor having plastic rectangular sheets onto which triangular prism polyurethane foams were tiled. Raw sewage after UASBR treatment was supplied to the chlorination unit and DHS-biotower
In case of chlorination unit, initially the bleaching powder was used as a disinfectant from day 1 to day 48 and later on it was found that there was no residual chlorine in the bleaching powder, so the bleaching powder was replaced with calcium hypochlorite as disinfectant after 48th day. The dose of disinfectant was 5 mgl-1 from day 1 to day 16 and was increased to 20 mgl-1 from day 20. The contact time for the reaction between wastewater and disinfectant was 30 min throughout the study.
 Results and Discussion Reduction of fecal coliform: To achieve good disinfection, the contact time and dose are extremely important. A longer contact time is required for complete disinfection to occur. As per Lindsay (2004), a contact time of 30 minutes is a minimum, and if the dose remains constant, the contact time may necessitated to be increased at low temperatures or higher pH to obtain the same level of disinfection. Typical chlorine doses for municipal wastewater disinfection are about 5-20 mgl-1 with a contact time of 30 to 60 min (Lazarova et al., 1999). During this study, 5 and 20 mgl-1 of disinfectant doses for a fixed contact time of 30 min was applied. It was observed that a dose of 20 mgl-1 was very effective for the reduction in indicator microorganism (fecal coliforms). Initially when a dose of 5 mgl-1 was used, the reduction in fecal coliforms count was less than 90%. It may be attributed to the fact that the minimum dose required for the killing of microorganism was not sufficient as there was high chlorine demand due to the presence of high concentration of organic matter and suspended solids in the UASBR effluent. The average fecal coliforms count was reduced from 3.58 x 105 (± 1.02 x 105 ) MPN/ 100ml to nil at a dose of 20 mgl-1 and 30 min contact time (Fig. 4a). Thus the results shows that almost 100% removal of fecal coliforms has been observed after chlorination; however at certain days i.e., from day 7 to day 14 and from day 44 to day 53 (Fig. 4a), the number of fecal coliforms present in the wastewater effluent after disinfection was increased. It could be explained on the basis of type of chemical used for the chlorination. During this period, bleaching powder was used. Later on it was found that the chemical used at the plant does not have any residual chlorine. Chlorination was switched to the fortified brand of the calcium hypochlorite, high test hypochlorite (HTH). It indicated that chlorination was very effective in the removal of fecal coliforms if the regular operation and maintenance (O and M) is ensured.

How to calculate area requirement for a WETLAND STP

How to calculate area requirement for a WETLAND STP

PHILOSOPHY BEHIND ENVO PROJECTS

PHILOSOPHY BEHIND ENVO PROJECTS

Saleem Asraf Syed Imdaadullah, Founder, Syed Envo Protect (I) Pvt Ltd in the year 1994 & ENVO PROJECTS in the year 2001https://yourstory.com/2009/07/saleem-asraf-syed-imdaadullah-founder-syed-envo-protect-i-pvt-ltd/

ITS NOT POSSIBLE TO FOLLOW ALL THE THINGS THAT OUR PROPHET (Peace be upon him PBUH) HAD DONE, HE IS MODEL FOR ALL PEOPLE IN THIS WORLD.

When I was 10-12 yrs old, i heard Maulana Madani (Senior) RA say that if somebody follows just one sunnah steadfastly throughout his life thats sufficient for him. And pray for me that I can do something for the betterment of this world before I die.... Otherwise there is no meaning of my existence in this world. Doctors are making peoples health better...engineers are making living conditions better.... Alims are making spiritual lives better.

The philosophy behind my work in environmental engineering

NOW HAVE I DONE SOMETHING OR STILL DONT HAVE ANY GOAL IN LIFE.no, I have found in Quran majeed myself that the world is a gift from Allah and nobody has the right to destroy it… .So we don't have any right in making our rivers into drain (read yamuna river,bhorolu river), polluting our air with our car exhaust, littering the greens with solid waste…. I am trying my best in this regard …after forming ENVO.

PREAMBLE OF ENVO

Nature is a gift to us . No individual or organisation has the right dto utilise its resources in such a way that damage or inconvenience is caused  to  people of society . we all have a social responsibility to protect and preserve a clean and green environment. The goale of profit maximisation and customer satisfaction should be surbordinate to the social need and responsibilities. The present concern has been brought about by the health of humans, living being, tree , structures, monuments and all other things.It was repeatedly mentioned in the Qur'an: Forbidding from spoiling the earth after Allah (Exalted and Almighty) has created it suitable and well prepared for the successive human generations. It announced that Allah does not like spoiling or those who spoil in life, this includes spoiling environment, polluting it or being aggressive with it. Also it is forbidden to abuse it in any way that would make it deviate from the purpose of Allah created it for. This would be like showing ingratitude to Allah, that would cause vengeance from Allah, and becomes like a warning to those who perpetrated this, that severe penalty will almost come upon them as what happened before to the `Aad and the Thamud and those who came after them.
"Who did transgress beyond bounds in the land (in the disobedience of Allah) and made therein much mischief. So your Lord poured on them different kinds of severe torment. Surely your Lord is Ever-Watchful." (89:11-14) Islam urges its followers to have great concern for everything created by Allah, for it is part and parcel of "submission to Allah" to show reverence to all what the Almighty Allah created.

We cant be all rounder like our Prophet (PBUH),but atleast we can excel in one field and serve humnanity as he did.

May Allah accepts my hard work and bestow his blessings on me and forgive me for the major and minor SINS I make in every steps

My own DREAM---"ENVO" : and to have its presence in every state of India. (Your time is limited, so don't waste it living someone else's life. Don't let the noise of others' opinions drown out your own inner voice.have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary.

 My Passion: My work. of water treatment, to clean the world gifted by god of the mess humans created.  ( Don't lose faith. I'm convinced that the only thing that kept me going was that I loved what I did. You've got to find what you love. And that is as true for your work as it is for your lovers. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it. And, like any great relationship, it just gets better and better as the years roll on. So keep looking until you find it. Don't settle.)

There is still a lot to learn, I try to learn from everybody and atleast one new thing every day : Stay Hungry. Stay Foolish

The World Only Cares About What It Can Get from You.

Change your attitude towards life. Do not look for perfection and CONTROL in everything in life. I understood that my livelihood (RIZQ)  cant be  taken away by  anyone.  Put your  best  efforts in what you do and than leave the result to ALLAH. I have plan but Allahs plan is much much better than mine. I have firm belief in ALLAH.  

During this journey many people came and left me. I thank all of them for their contribution for my growth. They are destined to be with me for that particular period. This is Allah’s plan.

Always sleep with a clean heart. I know many of us get wronged throughout the day or have gotten wronged in the past. Forgive. Not only forgive, but forgive and forget. Dont even hold a grudge against that person in your heart. Keep your heart completely pure.Forgive brothers and sisters before you sleep each night. this is one of the practices of the greatest people ever to live and this is how we will reach those highest levels of spirituality.

Forgiveness is good for your own well being, its about giving yourself permission to let go of the painful past. Forgiveness is not something we do for that particular toxic person,it is something we do for ourselves so we can move on to a better future.We forgive,not because that toxic person deserves it,but because we deserve peace, for a pure heart.
Read quran ,Sura 24:22 , sura 2:263 , sura3:133-134  , sura7:199, sura 15:85, sura 45:14

Ending this article with a hadith
Narrated by Abdullah ibn Amr, Prophet Muhammad (PBUH) stated:"Show mercy and you shall be shown mercy.Forgive others and you shall be forgiven by Allah."(Musnad Ahmad)

LOVE HUMANITY IRRESPECTIVE OF RELIGION, LOVE ANIMALS, TREES AND ALL OF GODS CREATIONS. IF YOU CAN NOT LOVE AND ADMIRE GODS CREATION, HOW CAN YOU THINK ABOUT ADMIRING THE GREATNESS OF GOD. 

PRIMARY EFFLUENT TREATMENT PLANT (PETP)

PRIMARY EFFLUENT TREATMENT PLANT (PETP)

PARAMETERS OF TREATED WATER for HOTELS , HOSPITALS and other industries currently accepted by Pollution Control Board of Assam. (PCBA)

The parameters of the treated effluent water will be  as under meeting norms of Pollution control Board (PCBA) .
pH Between 5.5 to 9
TSS (Total suspended solid below 150 mg/liter
BOD( Biological oxygen demand) less than 30 mg/liter
COD(Chemical oxygen demand) less than 250 mg/liter
Oil & grease less than 10 mg/liter

IF WASTE WATER FROM HOTEL, HOSPITAL EXCEEDS THE ABOVE VALUE, ONE PETP IS TO BE INSTALLED FOR TREATING WASTE WATER AND BRING IT WITHIN LIMITS MENTIONED ABOVE.

Our Consultancy & Supervision scope:

We offer our  work on consultancy basis for the Hotels ,hospitals, restaurants, wedding hall, ccar service station, tea garden and other industries. . All the civil & execution work will be done by the respective Hotel  , under our guidance from initial survey to the final report submission to the Pollution Control Board of Assam (PCBA).

1.Preparation of  drawing as per site condition for each location of hotels , it’s size , their  complexity and need of the hotel   . Thus there is no common solution for all hotels if Customized concept is adopted ,  So will  provide customized system plant for each site. Also, at various sites there are exiting septic tanks and other tanks ,pipes etc which can be adjusted in our proposed system which will reduce construction cost.

2 . We shall Provide a Flow Chart & project  report for submission to the PCBA

3.We will supervise the progress of the civil works during construction time of the ETP.

4.We will provide you a list of  dealers from where you can buy the pump , blower and chemicals.

5..We will train your staff for first 3 days how to run the plant & provide a maintenance manual for the plant

6. We will provide a first  water test report to be submitted to pollution board

7. We shall help in filling of the Documents to be submitted to the PCBA . All the legal fees & dues needs to be cleared by the client . The extra cost for Consent to operate or NOC is not included in the Consultancy

DATA REQUIRED:

a)Quantity of waste water generated liter per day

b) Waste Water test report .

.

TREATMENT METHOD OF PETP:

Chemical pre treatment followed by filtration

Flow Chart of PETP:

IN-Screen—Oil Trap---Collection Tank---Primary Sedimentation--— ------Disinfection Tank—Pump---Filter ----Out to drain

Details of different units of the proposed system

A)CHEMICAL TREATMENT OF WASTE WATER IN PETP

a)    Screen   :Waste water will flow through these drains by gravity flow from the inlet manhole. To remove large floating objects , bar screens and oil traps are provided inside the incoming drain itself .

b)    Collection tank: All waste water will be collected here .Lime and Alum will be added here and mixed by air bubbling from a air blower..Waste water will flow by gravity to the next unit.

c)    Primary Sedimentation tank(PST): The chemical sludge will be settled here. Waste water will flow by gravity to the next unit. Sludge is removed by sludge pump to sludge drying beds.

d)Disinfection tank : Disinfection is done here with bleaching powder to remove colour,  bactaria and other contaminants and  than pumped  to the pressure sand filter and finally released to drain.