EXAMINATION OF CONVEYANCE SYSTEM FOR WASTE WATER

Examine the present mode of conveyance up to the outfalls; if it is underground sewer, check for chocking, any cleaning needed - indentify sewer maintenance needs -, if it is open channel see its state, examine if cement lining is required -examine if underground sewer is required.

Examine the topography of the Estate and check whether more than one outfall could be economical, if underground sewers are adopted.

Examine if collection by tankers would be economical (advantages, immediate implementation, if industries are located at considerable distance; prohibitive cost of collection avoided).

DETERMINATION OF WASTE MINIMISATION OPPORTUNITIES

Categories of industries having been identified, production process / technology known, list from UNIDO / UNEP publications relevant to waste minimisation options - Recycle, recovery or reuse options. Discuss practicability of options with the entreprenuers. Report outcome.

Approach to motivate the entreprenuers for adoption.

TREATABILITY STUDIES

Conduct laboratory scale treatment studies on the terminal wastewater, physical, chemical, biological - determine the

Table 2 : Basis for Wastewater Catogorisation

Chemical	Reaction	wwc	Explanatory	Pretreatment	Acceptability
High SS	Highly settlable	A	Non-Toxic solids highly settleable	NP	Acceptable
High SS	Colloidal needs	A	Non-Toxic solids settleable after	NP	Acceptable
Organics	Highly  biodegradable	A	Org. Solids in solution and/or   suspension, highly biodegradable	NP	Acceptable
Organics	Slowly	A	Org. solids in solution and/or   suspension, slowly biodegradable,   eg.   benzene series	NP	Acceptable
In-organics	Acid	B	Mineral acids produced or used in   excess	N & SEP	Acceptable on   neutralisation
In-organics	Alkali	B	Alkalies produced or used in excess	N & SEP	-do-
High TDS	Preciptiable	B	Raw or product materials are soluble   in  water	CP & SEP	Acceptable on   precipitation
High TDS	Membrane  separation	C	Highly soluble solids need membrane   separation	NIP	Require expensive   collective treatment   using membrane   seperation

NO : No Pretreatment N&SEP : Neutralisation & Solid Seperation
NIP: No Indv. Pretreatment CP&SEP: Chemical & Ppt. & Solid Seperation

Table 3 : Treated Effluent Quality Standards for CETP

Parameter	Concentration in mg/1, except pH & Temperature
	Into inland surface water	On land for irrigation	Into marine Coastal areas
pH	5.5-9.0	5.5-9.0	5.5-9.0
BDD 20 degree C	30	100	100
Oil & Grease	10	10	20
Temperature	Shall not exceed 45 deg.  C  in any section of the  stream within the effluent  outlet		45 deg.C at the point of  discharge
Suspended solids	100	200	a. For process wastewater 100  b. For cooling water effluents  10% above total sus. matter  of influent cooling water
Dissolved solids   (inorganic)	2100	2100	-
Total residual chlorine	1.0	-	1.0
Ammonia nitrogen (as N)	50	-	50
Total Kjeldahl nitrogen   (as N)	100	-	100
COD	250	-	250
Arsenic (as As)	0.2	0.2	0.2
Mercury (as Hg)	0.01	-	0.01
Lead (as Pb)	0.1	-	1.0
Cadmium (as Cd)	1.0	-	2.0
Total Chronium (as Cr)	2.0	-	2.0
Copper (as Cu)	3.0	-	3.0
Zinc (as Zn)	5.0	-	15
Selenium (as Se)	0.05	-	0.05
Nickel (as Ni)	3.0	-	5.0
Boron	2.0	2.0	-
Percent sodium	-	60.0	-
Cyanide (as CN)	0.2	2.0	0.2
Chlorine (as CI)	1000	600	-
Fluoride (as F)	2.0	-	15
Sulphate (as S04)	1000	1000	-
Sulphide (as S)	2.8	-	5.0
Pesticides	Absent	Absent	Absent
Phenolic compounds	1.0	-	5.0
(as C6H5 OH)