How to Treat Rice Mill Effluents | Low Price | Easy to Install | Less Operations Cost | 100% Free Ideas | ABC Enviro Solutions.

Rice mill Effluent is that effluent which is produced from PAR Boiled section. It contain high quantity of pollutants and need to treat before discharge into inland surface or reuse. 

Basic Need: 

It is the basic need of designers or any Rice Millers/Operators about "Rice Mill Effluent Treatment" and before that they should have an idea about the characteristic of Rice mill effluent, process of treatments available in the markets etc.  

Characteristic of Hospital Wastewater:

In general Rice mill effluent is a tough matter because it contains high organic and inorganic substances and that lead to pollution of surface an in land discharge. The effluent has high Biological oxygen demand (BOD), Chemical oxygen demand (COD), and Total Dissolved solid (TDS). Effluent characteristics of a rice mill vary depending on the type of rice being processed and reuse of PAR Boiled Water in the Rice Mill. 

                        1. pH- 4.0-5
                        2. TSS- 100-200mg/l
                        3. BOD- 1000-1200mg/l
                        4. COD- 2000-2400mg/l
                        5. O & G- <30mg/l

Rice Mill Effluent Treatment Process: 
Other than above there is low concentration of DO (Dissolved Oxygen) Nitrate, Phosphate, Sulphate and moderately high concentration of Chloride and TDS (Total Dissolved Solids) Sodium, Phenols, Silica and starch etc. in Rice Mill Effluent. Due to high concentration of TSS, TDS, DOD, COD as recommended in Standard, it is said to dangerous and to discharge into inland surface as well as on land for irrigation.

There are so many advance technologies to resolve question "Rice Mill Effluent Treatment" in the market and such of them are:- 

 

a. Biological Treatment (FMR Technology), 
b. Ozonisation Technology, 
c. Both Chemical and Biological Technology etc.

Discussion Topic | Both Chemical and Biological Treatment Process:

As per our idea and application, Both Chemical and Biological Treatment method are chef , best and effective method and resolve question that "Rice Mill Effluent Treatment".

FMR/SBR/ASP technology are used in so many Rice Mill, but not successful due to it limitation.

The Process Flow Description:

a. Primary Treatment and Collection of Effluent.

A set Fine and Coarse Bar Screen- are provided into the incoming drain to block entry of    debris/grits.
O & Grease Trap/Primary Tank- to to prevent entry of Oil & Grease, solids into the system.
Remove by physical or physio mechanical process.
Some of small particle, suspended solids are deposited into bottom of the tank and will  remove periodically.

Effluent then enter into the collection tank to store and for pH correction.

Aeration Grid is provided for cooling and for increase of DO (Dissolved Oxygen) level.

b. Coagulation/pH Correction.

Alkaline substance- coagulants(mostly Lime, Caustic Soda flakes) is dosed in a small chamber (inbuild with Collection Chamber) to increase  pH up to 6.0. Quantity of alkaline substance are determine after jar test of incoming effluent into the Collection Chamber. 

A certain quantity sludge are formed  here and about 20% of  organic and inorganic load are removed.

c. Mixing and Flocculation.

pH corrected effluent is then pumped to Mixing cum Flocculation chamber(inbuild with Primary Clarifier), here Flocculants are dosed for more sludge formation. 

Poly electrolyte are dosed to increase weight of flocks. 

Quantity of Flocculants are determined after jar test. Here up to 40% of organic and inorganic load will be removed.

A small quantity of air are arranged for mixing of flocculant with effluent.

d. Primary Clarification.
pH Corrected and flocculated effluent is then over flow into the primary clarifier.

Flocks will be settled in the bottom portion of primary clarifier.

Flocks will be removed through Sludge Thickening, Sludge Drying Unit.

e. Bacteriological Treatment.
The main objective of this treatment level is to remove organic load present in rice mill effluent by aerobic process(Active Sludge Process).

In the Aeration Tank(MBBR)  aeration arrangement are provided to increase Do Level and is to encourage the growth of microbes. Hence breakdown of organic matter.

FAB (Fluidized Activated BED) Media are added into the aeration tank for random growth of microbes. 

Hence 80%- 90% organic load will be removed.

f. Secondary Clarification.
The digested water is then allowed to flow into the Secondary Clarifier where sludge will settle just below the clarifier.

We get a supernatant water at top of the clarifier.

This supernatant water  are collected into the Pre-Treated Water Tank for filtration

Sludge (Active Sludge) is returned to the MBBR tank in a certain interval to maintain required quantity of bacteria into the MBBR.

Excess Sludge will be removed by means of  Sludge Thickening, Sludge Drying Unit. 

This Excess Sludge can be used in the garden as a manure. 

g. Tertiary Treatment/Filtration and for final discharge.
The supernatant water what is collected into the Pre-Treated Water Tank is pumped through PSF & ACF  Tertiary treatment to remove residual suspended solids and for further removal of BOD & COD.

We get final treated water which is collected in Treated Water Tank for reuse.

h. Disinfection.
The filtrated water is then passed through disinfection system online after PSF & ACF for disinfection and for final polishing of the filtrated water.

We get final treated water which is collected in Treated Water Tank for reuse.

i. Sludge Handling.
The Sludge from both Primary and Secondary Clarifiers are allowed to sludge drying system and bagged for disposal.

Process Flow Diagram:

Process Flow Diagram

The Hole Unit Consist:
The hole unit consist of the flowing.

1.        Bar Screen- on line.

2.        O & G Trap.

3.        Coagulant Dosing System.

4.        Collection Tank.

5.        Effluent Transfer Pump.

6.     Mixing cum Flocculation Chamber

7.     Flocculant Dosing System.

8.     Poly Dosing System.

9.     Primary Clarifier.

10.     Fluidized Media Reactor (FMR). 

11.     Secondary Clarifier.

12.     Pre-Treated Water Tank.

13.     Filter Feed Pump.

14.     Pressure Sand Filter.

15.     Activated Carbon Filter.

16.     Disinfection System.

17.     Treated Water Tank.

18.     Sludge Drying Bed.

Installations:

One of it kind are installed at M/S Maa Maynamata Agro Food Product Pvt. Ltd. Maynaguri, Jalpaiguri, Siliguri, West Bengal, India.

Some Images:

YouTube Link:

Rice Mill ETP

Over View:

As per our idea, design  and application "Both Chemical abd Biological Treatment Process" are Simple, Low Cost, Easy operation, Low Footprint, Easy Installation and best method & idea to solve your question/problems  that is " Rice Mill Effluent Treatment".

Thanks!

ABC Enviro Solution.

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