PTP or Grey Water PTP is an advance designed technology for control facilities, management and Pretreatment of the oil, Grease, Sludge, food waste and waste water from and after the discharge from the standard type of the Grease Interceptor or Grease Trap. The system provide for the larger size, longer holding and settlement time from a few numbers of pre-fabricated Stainless Steel Reactor Tanks, come with the aeration water treatment chemical products and treatment of F & B, wet market and retail shops/ waste water (Excluding, Toilet waste) for example seafood and animal blood contamination, rotten fat and oil, sludge, food waste, detergent, soap chemical. etc.

The system treatment require is to comply to the public STP (IWK) Intake/
influent parameter of standard B2 Guide line value :

A typical aerobic effluent treatment plant involves three phases of treatment – primary, secondary and tertiary. Primary treatment involves the removal of solids including scum and sludge cakes. Secondary treatment is the major section of the process whereby aeration of the waste water in the presence of the activated sludge bacteria results in the breakdown of impurities. Tertiary treatment may be required to further improve the quality of the effluent prior to discharge and may involve removal of nitrogen, phosphates, suspended solids or pathogens as required.
As the influent enters the aeration tank it mixes with the activated sludge and also a flow of return or recycled activated sludge (RAS). Immediately upon contact with the incoming organic impurities, the resident microbial population in the mixed liquor (MLSS) grows with a concomitant rise in the respiration rate. The soft BOD (easily degradable organic impurities start to decline, followed at a later stage and at a lower rate the more recalcitrant (or hard) BOD). Ideally by the time the mixed liquor reaches the end of the aerobic treatment stage 90- 95% of the effluent BOD should have been removed.

If it reaches this state before the point of discharge there is under utilization of capacity. If however it has not reached this stage at outlet, then the effluent will be discharged into the environment with significant BOD still untreated. Under steady state conditions, the activated sludge that is waste corresponds to the net production of sludge resulting from the growth of biomass during passage through the aeration tank.

The kitchen waste water treatment systems invariably requires a large centralized grease interceptor prior to the pretreatment plant. The grease interceptor selected must be able to perform well and be able to remove the grease and oil to the maximum volume. Grease and oil trapped in the interceptor will then be skimmed away into a collection truck during servicing. Selecting the right size of the grease interceptor is based on calculations made on the actual fixture values of the kitchen only. (The Grease Interceptors removal efficiency performance can only remove base on percentage measurement of 99 %).

GREYWATEC Pretreatment System is a specially designed biological treatment for F&B Kitchen, Hypermarket (wet market area) waste water. The Plant consist of several prefabricated Stainless Steel Grade 304 Bio reactors tank and sludge concrete sump pits and is complete with pump, aerator and other treatment equipment and Froscozyme products

e.g. (AM S 140 X). (Concrete Chamber by others)

The primary tank CTSR and (RT1) is to further trap and collect solid/sludge cakes or sumps etc. escaping from the grease interceptor effluent.

From RT2 & RT3 reactors are aerated 24 hours a day and enzyme feeding is also recommended. Froscozyme (Amnite S140X) will be dosed into aerated reactors. This is a highly scented, liquid, biological product which rapidly degrades organic solids. The product rapidly reduces COD/BOD levels resulting in reduced operational problems and elimination of malodours.

In this aeration tanks, the bacteria are generally concentrated in floes formed from accumulations of non-living organic polymers. They have a porous structure but are sufficiently resistance to sheer forces exerted during rapid mixing and aeration within the treatment zone. Fine particulates, colloidal  particles  and  large  molecules  become  absorbed to the floes thereby allowing the  enzymes  secreted  by  the bacteria within the floes to facilitate their microbial degradation.

Part of the settlement sludge at the bottom of the tank will be dislodged into a sump and the waste water will be pumped back for further treatment once weekly.

The last Reactor (RT Tank 4 & 5 or 6 & 7 ) is the final stage of the process and treatment may be required to further improve the quality of the effluent prior to discharge and may involve removal of nitrogen, phosphates, suspended solid or pathogens as required.